is a heathkit catalogue from 1977 worth anything?
probably a small amount
there are collectors for just about anything, my nick may give you a clue as to my bad habit
for 3.5k you too could have owned a 8k computer
operating at oh i think a blazing 4mhz
max 32k memory
4k upgrade is only 140 bucks
stuff was a bit cramped in the old days, but then we coded in assembler and didnt waste space on eye candy
oh my, my bad 2mhz
omg, commin soon, startrek, that was so much fun to play
my first was an MK14 by Science of Cambridge 256 bytes of ram iirc
how should I ship my parcel from mesa?
ground is only 7 bucks! lol
will i be able to make progress once there here or do i need the comptuer up and running before I get them
1 EA. 5I20 $ 199.00
1 EA. 7I37T $ 79.00
1 EA. 7I33T $ 79.00
any thoughts on how soon i can do this stuff?
It will take you approximately 6 years
if you are anything like me
so go for the ground shipping
i need this thing up and running lol do i need a computer first or do i just put wires in the card and then insert into motherboard?
not sure how this i/o stuff works
there are gonna be wires everywhere
The computer has to send a program to the card to work.
I need to track down some hookup wire
have you ever put together a computer from parts?
Hope you all had a good New Year. I happened to think you guys and figured I'd hollar.
think about* you guys
I think - there for I am..
good thing we didn't pop out of existence first
skunkworks: but that's not true
well.. I'm thinking I should go to bed :)
hmm only 1 am here
close to 3am here
eric_U yeah its not a problem i know a lot of electronics, i was an it in the navy not that it did a lot lol
well, push the mill down to the local pond and you'll have it together in no time
the mesa part should be fairly easy.
what tells the mesa card what all the wires are?
you do have to figure out what to wire on your machine to the mesa, that's complicated, but not that hard
I'm a mechanical engineer, how do I know that?
ignore the 5i20 for now, just look at the pinout of the 7i33/7
but the 5i20 is programmed every time you load emc
so that it follows that pinout
what program does that?
it's in the configuration files
this sucks now i need to build a whole new computer lol
the motor I got for $30 on ebay is new, they probably list for over $2k
only downside is the seller smokes like a chimney, it smells like cigarettes
that will wash off or fade
what kinda motor?>
it's a nema 42 ac brushless electrocraft
usually feel like I've stolen them when I buy them for $50 + shipping
im scared about doing this lol
Gamma-X: then don't
read, learn, then do
already bought cards lol
im jsut scared about cutting wires.
yeah, but did you take your dikes to the old control?
then not ebin able to go back to the control wich didnt work anyway lol
I thought it worked
it did but keyboard broke yesterday
650 for a new keyboard
how did u guys figure out what all the cabling was? lol
thats why emc is good - no proprietary part$
how long did it take ya? lol
what project are you talking about?
uve done more than 1?
I don't know what "you" you are talking to - there is a whole channel here
I've worked on the mazak at the CNC workshop, and my own shoptask 3-in-1
the mazak is a complex servo machine with a toolchanger, the shoptask is a chinese piece-o-crap with steppers
mazak musta tok a while
four weeks spread out over three years
well myne has to be done asap
i think im gunna go for the record.
and going to work at the same time
not bloody likely
never even think of rushing a job like that
not with your base... :) you need to read all the emc2 manuals forward and back..
we know from your comments you have not read enough yet
* archivist is a happy bunny with his noo steppers
archivist: decide what machine you are gonna stick them on?
i have a feeling hal is going to take a long time to configure lol
heh, thats the hard part
when I read back I saw something about hobbing
jmkasunich, we have a few old hulks here that could be attacked
depending on what it is and its condition, sometimes it seems a shame to attack a nice old machine
the manuals are realy well writtin so far
especially a mechanical gear hobber - they were designed to make all the neccessary motions with geartrains and such, and that stuff would be wasted if you CNC'd it
jmkasunich, the one Im thinking of has been dropped, was a bur miller
what's a bur miller?
still has some nice slides
something horological, or just a british term for something I'd recognize with another name?
small burs as used in a dremel
ball or conical shape etc
for engraving and such?
I think that would make a gear mill
or cnc my hobymat lathe (its a steaming heap of....)
if the work spindle and the axes were all motorized, you could probably do some decent hobbing
I have too many choices at the moment
make a gear hobb for the win make a gear hobb for the win
could you do hobbing with syncronized motion?
encoder on the spindle?
but threading and gear making need speeding up here
its not so much the speed, its the timming
needs to be well synchronised
and the ability for one axis to react to the other, ie cutting slows something down
I think emc does pretty good - seeing the rigid tapping on the mazak..
well atleast ill get full usage of my vfd now
there is a hal component called encoder-ratio that is designed to slave an axis to an encoder
and be able to go back to the begining and recut slightly deeper till dia is correct
if you had an encoder on the spindle turning the hob, and a motor on a rotary holding the work, you could slave the rotary to the hob and then use g-code for infeed, etc
jmkasunich: then gear cutting = no problem
archivist: are you thinking of the kind of cutting where the hob is a worm with flutes, but set at an angle to the work so you can make a straight toothed gear?
so need to set the head over at worm angle as well
yeah, lots of axes
only need two under CNC control as a minimum though
feed across the face of the gear, and infeed toward the center
or for more fun include stuff for helicals
you can do that set up on a lathe, with X being normal, and then you use the compound to set your helix, with your gear holder bing a Y and slave to C
shoot, no that wont work
i was thinking of passing the gear under the hobb
that could work
you'd have to feed upwards between passes, lathe can't do that unless you add a slide
yeah, thats where the extra stuff on top of the compund comes into play but it makes for limited presentation to the cutter
lathes arn't really rigid enough
depends on how big a gear you are cutting
you go clock stuff, right?
I want to go larger than now (2")
I het the limits of this old machine here easily
well for a lathe to do it, you want the hobb in the lathe spindle, where the power is, since the gear isnt going to be rotating too fast anyway
hob in spindle, gear on rotary table, table synced to spindle
archivist: all straight toothed gears?
I think you can always just run the table at 1/N times the spindle speed, where N = number of teeth
gezar, have done a few helicals
yeah, it gets weak on a lathe quickly doesnt it
I'm playing with EMC2 but can't get anything out of the parallel port
yup not designed for forces in that plane
hobb sits ----- gear sits ------- and you can feed the gear on a Y axis ^ through the worm to get a straight toothed gear, but its going to want to push back away from the cutter in \ plane
I've got a machine that works well under Mach but I want to run EMC
what doesn't work, and what have you tried?
archivist: it may not be that weak after all
Well, I don't know what the port numbers are for the parallel port
the address, like 0x0378?
gezar hmm possibly
I'm using a dual parallel port card (PCI) that is Plug and Play
yes, I've tried 0x378 (LTP1) and 0x278 (LPT2)
archivist: mind letting jacques and jmk talk while we use messages?
gezar, Im about to escape as its 2 am
gezar: I mind
gears are interesting
jacques: I'm trying to remember the ways you find out PCI addresses on linux
archivist: ah, oh wow, okay, I think that a vertical moving Y axis can be very strong
jmkasunich: try lspci
I'll try that
I was digging around in /proc/ioports
i think proc/pnp cause pnp is handled differently by a kernel moduel
0000:00:0b.0 Communication controller: NetMos Technology PCI 9815 Multi-I/O Controller (rev 01)
there is your controler,
another interesting point about gear milling is the setup time for very small gears, can take best part of a day for <3mm
yeah its retarded on non dedicated hobb machines
I don't have /proc/pnp
Maybe I should check my bios settings
jacques: try lspci -v
that will get you more info
so the machine really needs to be able to find out where the center line is of the cutter and the spindle
I get more information, which looks like the Device Manager GUI in Ubuntu Gnome
hmm, there is a a ha, pnptools
command not found
0000:00:0b.0 Communication controller: NetMos Technology PCI 9815 Multi-I/O Controller (rev 01)
Subsystem: LSI Logic / Symbios Logic 2P0S (2 port parallel adaptor)
Flags: medium devsel, IRQ 12
I/O ports at a400 [size=8]
I/O ports at a800 [size=8]
I/O ports at ac00 [size=8]
I/O ports at b000 [size=8]
I/O ports at b400 [size=8]
I/O ports at b800 [size=16]
there you go
which one do I use.....
may have to try one at a time
I cant find a good answer for you jacques
I've got them jogging now,
One is not working, but I'll figure that out
I had no idea what tools to use to figure out the IO ports for the parallel card........
glad we could help
jmkasunich: and I love gear cutting
well, im facinated by it, I dont do much of it
I've only cut one gear (made several of them though), and it was a worm gear - simpler than a spur
hgr has some barker mills, may be of interest http://www.barkermill.com/pm.htm http://www.hgrindustrialsurplus.com/search-products/product-detail.aspx?id=42-198-005&searchtable=2&sortExpression=&SortASC=&pageSize=50¤tPageIndex=0
some of those production mills don't have table leadscrews
they have either levers or hydraulic feed
right, but a good piece of iron for those looking at HF or ... ( it would need work and is a good pc of iron )
hf stuff isn't worthy to be in the same room ;-)
i wonder if anilam has a pin diagram of the control...
tomp2: thats actually quite a deal - two for $200
looks like the robbed the table off of one of them
the other looks like 2 machines ( and has cranks so may have screws )
i have a small atlas mini mill
archivist won't want those though - shipping to the UK would be a bear
i have a small hardinge ( navy trainer)
tomp2: a UM?
uk is full of small mills, they dont get over here :-(
UM? dunno, horizontal, table is maybe 3"x12", knee type
that sounds right
oh, yeah, if you live near a big armed forces base thats shutting down... look for those ( and big ass HP scopes etc )
[02:42:24] <jmkasunich> http://www.lathes.co.uk/cataract%20miller/page4.html
yours sounds more like a BB4 than a UM
theres soooo many wires! lol
i jsut checked it out..... wow. this is notttt good lol
didn't you work on stuff a lot more complex in the navy?
hahaha we had publications
tells u wich wire is what
if I knew wich wire did what id be fine
yep, bb4 pix looks right
thats a great site for those machines
thats a great site period
fenn: you around? what svg editor creates the least verbose files? I'd be making simple templates like hal symbols
that's nice, the IRS sent me an email saying if I give them my credit card number, they'll refund my taxes
Internet Racketeering Service?
gmail deconstructs these things nicely
you can't click on the links
oh, that's nice of them
and they show you where irs.gov is really directed off to
I've heard of outsourcing, but hosting the irs.gov website in hong kong is stretching things a little, isn't it?
nah - it's cheaper
privatization, of course - gotta increase efficiency
astually, in Hong Kong, people probably speak better english than in most of the US
itwas a British colony until a few years ago, if you recall :)
of course, I've never been there, so I can't be certain that's true
I don't meet too many HK residents any more, but back in the day they had heavy accents
no, they do not speak better english.
than most Americans?
how many people from New Jersey or Alabama have you met? ;)
I knew a guy that had a Chinese/southern/british accent
does NYC people and FL people count?
New Yawk - nah
he was from HK, went to grad school in Alabama
and they have to learn mandarin &the new character set(guo biao GB) ( now ( Learnout & Haspie are making a bit out of that)
that new char set thing is a crock @#$!@#!#@!
oh yeah, like you can write bird in old as fast as i can in new?
old = too many strokes
no reason to change it. it ain't broke
ds2: make any progress on your ballscrew?
jtr: no, bunch of emergencies popped up... like a storm and wipers stopped working on the car :(
ugh. wipers can be important in storms. on my old opel, I had to disconnect the one on the passenger side on the way in to work one night.
heh, that sounds like what I did this morning
what I am trying to figure out is if it should have splines from the motor the arms or not or is it just a taper drive
it was not fun... doing 65 on the freeway and then having it not work and at least a few miles away from the next exit
tapered spline, I think.
the dealer insist it is a smooth taper and it is splineless... so we settled on him asking the factory
I should say, smooth on the arm side and splined on the motor side
at least one car I had was tapered spline. Dealer says smooth at the wiper arm? what kind of car?
I don't see the reason to have splines on just one side
if it was smooth both sides, I can understand that... (like a drill press chuck taper)
it's a friction fit - that makes it possible to put i ton and maybe take it off later
put it on
SWPadnos: that's the reason for making only one side splined?
and you don't have to manufacture it to bearing tolerances
sure - the spline is probably a harder material than the taper side
err - smooth side
so you bash it on, the weaker wiper material deforms a little, and it's cheap to make
Hmmm sounds reasonable
that's my theory, and I'm sticking to it ;)
too much looking at only precise stuff
if the factory says that's the case, I guess I'll believe them
cars are strange - everything has to be really friggin cheap
they insisted the manuals don't spec it and they didn't have one in the parts dept
so they can charge you $hundreds for it as a spare part and profit!
I took 1 quarter of automotive machining at the JC and I am totally disgusted at how they go about things
heh - yeah
the machining dept didn't teach much abrasive machining anymore so I figure automotive folks should do more
we were designing a device to be put in car seats (and airplane seats) - at the time, the rule of thumb was that if it cost more than $25 to make, they wouldn't go for it
and this was for Mercedes and Volvo (among others)
they did more, but it was so specialized and idiot centric... :(
$25!?! that is a low BOM cost
for the entire module
but in 100k-1M quantity
but even the toys from mattel has higher bomb costs
cool - it looks like it may still be sold: http://backcyclerllc.com/index.html
I know the company went out of business a few years ago
(well, the original company anyway - I guess Rowlie started up again)
the instructions for my new tablesaw says I need to clean the shipping gunk off with kerosene, no acetone
apparently because they are afraid I will catch myself on fire
acetone is much more volatile than kerosene
acetone leaves the metal really dry, kerosine is a very very thin oil
top of the cracker stack
and a portable/car back massager ( quite a few from homedics) http://www.walmart.com/catalog/product.do?product_id=5913219
homedics is crap
(they even copied the name of the original BackCycler company - Ergomedics)
I was planning on putting past wax on the saw
look at woodworking sites/suppliers, there are applied coatings sold
if you cut lotsa pine, or other 'aromatic' woods, you might get get some pitch on the blade
or are you waxing the cast iron surface (the deck)
saw was too expensive to come with a blade
dunno, i've thought about doing that
i got a Kitty ( french 5 in one )
Kity ( -10 sp) http://www.kityuk.com/
2600 baby! woo!
(not me - I have a used Craftsman table-top)
I used to have a bt3000
i dont see it listed, (10 yrs ) most like the combi 2000
originally was a $1000 saw, I bought one for $600, when they discontinued them, HD had them for $150
table saw, jointer, planer ( 4 1/2") , mortiser, horz drill
that was a great saw for what they sold for in the later years
I think it normally went for about $300
those combo machines look nice
how hard is it to switch?
too small for most work, i made a few craftsman end tables, some boxes.. too darn small
switching is easy, a central flat belt drive is just loosened & moved
I decided to go high end for this saw, no messing around
the mortiser has an x/t table driven by levers ( like jmk said of some small mills )
that could be useful
good blue handled english chisels work better (& cheaper)
I was just thinking about some of the stuff Krenov did with his mortiser
krenov, beautiful stuff
I just saw someone talking about buying a Maloof rocking chair, $25k
man can barely walk, he's 85, and has a 5 year backlog
i'm such a hack. i never did enuf with those tools. just gave away my incra jig to a nephew whose doing some nice work.
i thougth i'd make gerstners
I made a nice toolbox
but I never really liked the gerstner design
I need to make more toolboxes
the simplist difference of gerstner to knockoff is the presence of the bible drawer ( the tool makers handbook drawer )
I left that out, makes me a knockoff :)
i saw an issue of woodworkers quarterly, with a tool box on cover, was an arched top, opens like old timey lunch box, gourgeous. all the drawer inside fold open on little brass levers
well, back to widget building ( no chips, no grease, nothing to sweep up :-)
cool, I just managed to crash firefox
ds2: you still around?
how did that bearing issue turn out?
didn't get a chance to look at it... little emergencies :(
at the rate things are going, it'll probally be feb til I get to it :(
wipers on car broke in the middle of a heavy rain storm
did you excede the limits of the road machine?
if you call doing 65 in a 65 zone on a free way and having the wipers suddenly stop...
what happened to STEPGEN_MAXVEL?
jepler: why did you get rid of "MAXVEL" in the configs/stepper/stepper*.ini, and how is the stepgen maxvel set now?
I seem to recall some value being hardcoded to something slightly above the set value in the ini, though it may well be backlash
uh, yeah, I think it was the backlash speed
AXES = 2 ==> motion-controller.time = 88000+
AXES = 3 ==> motion-controller.time = 33000 to 50000
more axes = faster?!
it can't be that that's 1/time or something?
hell, when axes = 3 , both servo-thread and base-thread are faster
that sounds fishy
brb, I'll triple chk
he was talking about putting math into halcmd the other day.. (no math expressions was why we needed a separate ini value)
um, but not 2 months ago
maybe it's only a problem for accel
demek o kisim otomatik mount olmuyor ki bu normal
no, it isn't count(axes) that gives the lower thread run time -- it's the *_PERIOD
lowering *_PERIOD too much somehow causes the 'time' of both *-threads and motion-controller.time to increase
though I haven't narrowed down to which PERIOD value
any ideas, people?
maddash, it couldn't be that the threads have to fit into N base periods and the quantization gives a rounding that jumps from N to N+1 base periods?
BASE_PERIOD is the culprit
lerneaen_hydra: no, it's probably simpler than that
my base per is so low that the cpu spends lots of time executing base-thread
which jacks up the servo-thread time
hmm how'd you arrive to that conclusion
a BASE_PERIOD = 40000 ->[servo-thread time, motion-controller.time]=[89068,64956]
oh, wait, is it the total time from start of execution to end including time that other threads take during the execution of a long thread?
uh, that wasn't very readable
BP=50000 -> [58836,48000]
do you mean that as the base thread is called often it interrupts the servo thread multiple times, and as such makes the servo thread take a longer time to execute
[sigh] should've gone with the SMP board
the total time spent doing just the servo thread should be nearly the same though
oh would SMP allow a base thread on one core and a servo thread on another?
or just one for RT and one for userspace?
no, it isn't, and that's the point
lerneaen_hydra: RT on one core, userspace on both
yes to the second, using isolcpus param
alex_joni, uh, right, that sounds good
finally some decent internet bandwidth :)
no, back home :D
hm, so BP=50K means one full step cycle takes 100us, which means that I can do 10^6/10^2 = 10^4 steps/sec
ah, right :)
maddash: unless you use doublestep
lerneaen_hydra: I was at our weekend house, only had some cell-like accessible there
alex_joni; oh noes..
it didn't work very great, but it worked
got about 5-20kB/sec
now I'm back at my 10Mbit :P
hmm, I just thought of something, at high stepping rates, or rather, at the next highest stepping rate, won't jitter be very noticable, and won't the acceleration between different speeds be pretty much nonexistant?
maddash: yes, doublestep
ah nice :)
ideally you want a base period which is at least twice as fast as the step-rate you want to use
alex_joni: I can read, but I haven't a clue what that is, hence the '?'
in other words, half the 1/steprate
maddash: what does it sound like?
oh so a change in speed at the maximum speed will "only" result in 1/4 speed changes?
[14:03:03] <alex_joni> http://axis.unpythonic.net/01188134101
alex_joni: so what's your point?
and is that acceptable in practice?
as in there's no major risk of stalls and so on?
alex_joni: I already took into account the 2x BP for each step
of course that will depend on the machine
maddash: using double step you can get max stepping of 1/base_period
if you do need finer granularity (less jitter) then I guess you need a HW pulsegen
that brings you out of the range of easy to do with standard hardware for the lay person though
well.. take your pick :D
cheap & standard hardware.. limited results
somehow expensive & custom hardware .. better results
yeah well it's kind of obvious actually :)
alex_joni: the "reset" function to the parport driver is that in place now? or do you have to add it manually
BigJohnT: you have to add it if you want to use doublestep
ok, just wondering after lookning at the link
BigJohnT: if you use stepconf, then the configuration generated by stepconf uses doublestep
didn't use that but I'll give it a look see.
just glad I did the math on all that before I started to build the machine :)
BigJohnT: that's always safer then afterwards :)
alex_joni: yes :)
lerneaen_hydra: i'm supposedly working on something like what you describe with the external micro reading encoders and doing pwm
but in reality i'm reading the amber spyglass and about the effects of wheat gluten
fenn; you mean the one I described yesterday?
fenn: looked at linear actuators for the hexapod?
I mean.. satellite dish positioners?
seems expensive and non-ideal
poorly documented too, so i cant really point to anything
fenn: seen some cheap ones..
probably crappy though
well, cheap is relative, and i'm on the low end of the scale
they probably have gears with high ratio, acme screws, slow position feedback, etc etc
20% duty cycle
fenn; oh that was your page+
* fenn blinks
fennetic.net is my domain, yes
didn't see that yesterday
how much smarts does it have?
but it should be extendable as much as you like
ok, let me rephrase, how much smarts will it have
will PID still be done via emc?
oh you wrote that down there -.-
i'd like to support a step/dir mode eventually, but will start with closing the loop in emc
i've done pid in micro's and it's not that hard
hmm, why would you want to go to step/dir?
so idiots will buy it
oh you're going to sell it
right, then I see the point
so this is more of a general purpose servo controller more than anything else
it's an inexpensive modular system for low-end servos
it's all relative
* fenn shrugs
i need to clean up that wiki
alex_joni: stepconf is much better than the first time I tried it. It also gave me 672IPM with my current gearing!
and it boosted your horsepowers by 50%?
nope, how could it do that?
many things are possible with the magic of specmanship
did you know you can plug a 5HP shopvac into a standard 15A 110VAC outlet?
its ironic that james watt invented the horsepower
heh add microstepping get magic extra accuracy
and now the unit of power is the watt
yea and we got a 5hp aircompresser too
i wonder if they have similar spec-inflation in metric countries
salesmans standard speeek
what's the unit of volume for an air compressor? l/s ?
putting a 5HP label on a 1HP motor <---- spec inflation
cubic cubits per fortnight
ah, sure we have that :)
fenn: where? in the US its SCFM
we have l/min or l/h
cfm over here in uk
heh - "metric in many places"
metric enough to lord it over us :)
still miles/hour for speed limits though :) (in the UK)
well.. I wish we had your units right now..
dollars per second?
it's a bit discouraging to look at the inside thermomether and read 11.5C
hmmm - it's about 15 in my office
SWPadnos: this is my bedroom
thats 52 F = pretty darned cold
i think 11.5F would eb worse
oh - that sounds comfortable, as long as you're under thecovers
jmkasunich: no, we were away for 2 weeks
heating was set kinda low
it'll take a while to heat up
* skunkworks keeps the house at 58deg
alex_joni: I didn't even see the addition to the menu for stepconf on 2.2.2... The config it generated works better Thanks
you do realize that jepler wrote stepconf, don't you? :)
no, but alex_joni pointed it out to me. Thanks for writing it jepler
* archivist gives up and carries on wiring
* Skullworks-PGAB is cheaper, I set it for 55
* gezar has way too many linux books
* archivist archives gezar's spare books
i mean I have a ton of books
only a ton
i know i have 100lbs of books in phoenix, my brother wont ship them to me
books are a bad habit for me
one day I might get them all catalogued
i have books on perl and C and cpp and all the visual studio shit I think
5 more days till I start school
this world of warcraft stuff, which I do like, is eating way too much of my time im affraid
im going to have to make a decision soon on it
my first machine design jumped closer today when I obtained some cheap slides
* Skullworks-PGAB has the genuine M$ MCSE study course sets for W98, NT4, and MCP guides for Excel, Office and other crap. - oh yeah and a half ton of badly outdated 'nix books too.
i could power a city of 2000 people for 10 days if I had a tubine furnace and burned my linux/ms books
* Skullworks-PGAB needs to go camping with a group of geeks and have a bonfire
* archivist is sad enough to have whats catalogued so far on the net
5 ballslides for 40 quid
the 6th is going cost you 400 heh
ball slides are awsome by the way
you can get >1200ipm with some
only small ones
cant do that with box ways even with trucite
and I dont know the loss of ridigity when comparing slides to cast
especially over time....
Its all in the design
holy shit archivist
for a gear miller I think they will be ok
a slant bed gear miller man
spindle and C normal like on a slant bed
Mori Seiki finally went over to liner guides once they found methods they trusted.
heh came with a piece of bent 3/4" ally could easily have it slanted as its bent at about 60 deg
then x and instead of a truret use an anglke plate, with Y up and dow on it, then on that face, mount a rotatary table for well, it was easier to see it in my head
I could arrange a pic of available shrapnel perhaps
but the gear presentation is like a U shape with the gear spinning shaft up near the top of the U and the drive off to teh side
hmm lathe/gearmiller /.......
am I making any sense?
I shall try and draw it up
I am trying to picture with what shrapnel I have
I may/will install crap screws to experiment till I find some nice cheap ballscrews
Mariss ESTOP circuit diagram http://www.zshare.net/image/621923993fabc9/
If I moved the N/O button from where it is now, to bewteen the NC contact and the coil, would it work?
(basically, just move the top part of the N/O button from the common contact to the NC contact)
(no sarcasim intended)
it shorts the contact which powers the coil whic then maintains the short
Um, maybe I'm not explainign it right...
which maintains power to the system until the stop it hit
if its working dont mess with it
See, the problem with the circuit as it stands now, is that if you held the POWER ON button in, hitting ESTOP button is useless and keeps the circuit energized.
All the electricity is going thru the POWER ON button instead of the relay.
thats why its a NON latching button so you dont do that
But if the button ever got stuck, it circumvents the purpose of ESTOP completely.
uploading in a sec
I've tested this in RL.
no the power does not go through the button it only powers the relay coil
You cna hit ESTOP all day long, and will still have power if the PWR ON button is held in.
archivist: Yes, it does. I've actually tested this.
archivist: do you by chance have the link to my photo thing on picasa?
well, its still uploading
Jymmm, yes your right
archivist: Np, it's confusing, but I had to look closely at this to find that.
okay, try this http://picasaweb.google.com/dagezar/RaidJunk/
its the last photo
Jymmm, you need another contact on the relay
shoot, I left x out, my bad
archivist: So I've heard. But, what if I move the PWR ON button from the Common leg of the relay to the NC contact?
Jymmm, no it wont start
archivist: That way, when the relay is energized, the button iddisconnected .
that's why you buy an expensive button
archivist: why, not fast enough?
but what if that relay is stuck on?
Jymmm, try thinking the button shorts the contact to pull in the relay
I'll have to look at my estop circuit, but I think I have the same thing
very common industry practice
you'll find the same circuit in the Mach3 manual
archivist: Right, but if it's moved to the NC contact, it is still the same path as it stands now. The only difference is that once the coil does energize, the PWR ON button is disocnnected from the circuit
when open the button will do nothing at all
wait, reverse that
it wont be able to start it
archivist: It's still the same circuit (while off)
I guess what I'm saying here is that it's a split second from the time the coildenergizes and would that be enough time for it to latch.
mine has a power switch and a start button. The start button takes the place of Mariss' power on button
Jymmm, may just produce a spark transmitter
archivist: Ok, now you're getting it. But that cuirit latches the relay if you didn't realize it.
gezar, I see the pic
still, your relay is going to fail stuck on more often than your switch will fail
Jymmm, depends on relay speed and inertia
and if designed for safety its likely to not work
try it and see
archivist: I have on 12VDC relay and it works, but not so sure for 120VAC
expect to have to press more than once, or just here a buzzing noise
it's not a bad idea, but you are setting yourself up for a relay failure long-term
archivist: Yeah, that's what I was thinking.
archivist: Now, why/how would a 3rd contact help in this?
"Jymmm: But if the button ever got stuck, it circumvents the purpose of ESTOP completely." - you would face the same issue if the ESTOP button internals failed also.
that's why I have three layers of being able to turn the thing off
plus I'm putting an estop button on the ground
so when I 'm hiding from the shrapnel, I can still stop the machine
Skullworks-PGAB: But with this being latching, it should disconnect power enough not to reset in a power on state.
Skullworks-PGAB: and I could always use two relays in tandem.
Ive spent too much time with nude machine tools to worry about estop
or use 2 power on buttons in serial - the way many new CNC's are from the factory
Well, since I'm the only one who as ever caught this mistake in MArriss's design, I suspect others are the same way as you archivist.
Maybe Marriss knows, and that's why you no longer see this on his website.
is this a mistake?
eric_U: Well, an oversite really.
also, I do think that Mariss' designs go into machines where estop isn't all that essential
"Free advise is often worth what you paid for it."
I dismissed this design, but I don't really remember why
thinking it is because it doesn't work in my system anyway
eric_U: it would work in any system.
even a lightbulb.
my system doesn't have a transformer/dc supply like that
does it have a power switch?
if so, then it would work.
yes, but that's a stretch
No, just look at MAINS and the point where it meets the transformer,
plus I'm putting my limit switches in there
and there is no input from the computer
your running 120VAC thru your limit switches?
that's what I'm saying, it doesn't work in my system
Jymmm: right now one relay contact feeds the main transformer and latches the relay. you can separate those functions if you add another relay contact.
jtr: Ah, gotcha.
jtr: TPDP would do it?
gotta run sand drywall...
jtr: I'm still thinking that there might be a way to rewire this somehow and get the proper functionality to it.
Jymmm: Normally, you would have a contactor which has power and pilot contacts. The pilot contacts perform the latching function.
[20:12:35] <Jymmm> http://cgi.ebay.com/NEW-NIB-PLUG-IN-RELAY-11PIN-3POLE-120V-COIL_W0QQitemZ150199430876QQihZ005QQcategoryZ78205QQcmdZViewItem
11 pin == NO/NO/C * 3 + 2 for coil
11 pin == NO/NC/C * 3 + 2 for coil
anyone out there care to comment on tuning issues?
I should be sanding drywall too
the main issue with tuning is don't try to hold onto the timing belt
what are you tuning
trying to tune a test axis on a motenc card
what equipment is in this "test axis"
the STG tunes so easily and this one is giving me fits
daveengvall__: the last time I used it which was trunk around june.. f-error looked correct.
[20:15:18] <skunkworks> http://www.electronicsam.com/images/KandT/servostart/ferror.png
that would have been 2.2 pre-release. iirc
skunkworks .. I think someone forgot the subtraction
daveengvall__: got a screenshot?
could be.. but I have nothing to test here at the moment.
test setup is an SEM HT-30-44 with servodynamics amp ... motenc-100 card
alex ... for a one inch move the plot starts at plus one and ramps down to zero
what did you plot? (pin name..)
daveengvall__: a screen shot would be very helpful
I've used this same test setup with ppmc at 400+ accel
I'll see what I can do about a screen shot
but since dave is in the boonies, a screenshot might take hours to upload
oh just a bare motor?
with a 2.5 dia x 2" piece of shafting as a flywheel
a screenshot of halscope should only take a minute to upload
not at 300 baud
I'll see what I can do about the screen shot ... have cable so speed is not an issue
Ray is one of the few that still have slow connections
daveengvall__: hint: print screen on the keyboard :D
300 baud??? wtf.... you carrying bits next door and dumping them in in a TTY
he has to enter them in using switches
I'm in the middle of fighting problems but ... I think I can get a screenshot.
ohh like the old Moogs...
cover your head...
I just changed the ini .. trying to get negative moves to work.
g0 won't work at all .. g1x1f0.1 immediately halts
but 1" moves are OK.
long moves don't even get started ..
I just clamped down my ferror .. was operating at 10 and 2 and moved it to 5 and .5
P is set just below osc and everything else is 0 ...
that should produce moves just not good ones
I'm going to go try the screen shot.
see ya later
that man can throw some switches fast
eric_U: he has switches arrays
I remember when I was in high school, the guy at the local art/architect supply had just programmed his computer to play some game with switches
the game was on a terminal, asteroids or something
What's a " DEFINITE PURPOSE CONTACTOR" ? http://cgi.ebay.com/NEW-DEFINITE-PURPOSE-CONTACTOR-CN-PBC302-240V-30-40a-2p_W0QQitemZ150150444033QQihZ005QQcategoryZ42895QQcmdZViewItem
I think it's still a contactor
a lot of contactors are meant to be part of a motor starter, just add heaters
and what's "FLA 40AMP" -vs- "REA 50AMP" ? specifically the FLA
and what's "FLA 40AMP" -vs- "RES 50AMP" ? specifically the FLA
REs I assume is resistive load
Full load amps?
I just saw that yesterday, and forget
Yeah, just saw that, what does it mean though?
Couldn't they have just said inductive instead? Or doe sit mean something different?
This one looks promising http://cgi.ebay.com/NEW-AC-HEATING-CONTACTOR-CN-PBC402-120V-40-50a-2p_W0QQitemZ150177948234QQihZ005QQcategoryZ41987QQcmdZViewItem
I think resistive loads are worse for relays and switches
eric_U: when I see resistive, it's always a higher amperage rating
[20:45:09] <alex_joni> http://tristate.apogee.net/mnd/mfnrfla.asp
alex_joni: what is it?
inductive loads are worse, the back emf causes arcing
archivist: ah, ok.
$7 for a contactor, I hope that's not being too cheap
what are you switching?
spindle and ductvac
just seems really cheap for a contactor in general
what spindle motor
12A peak at startup
I prefer NOS industrial surplus
that usually requires more work
eric_U: and I'd prefer to use your cc too, but it aint gonna happen =)
I've seen contactors on ebay that weren't much more than that
$0.99 nice price - http://cgi.ebay.com/NEW-NIB-PLUG-IN-RELAY-SOCKET-11PIN_W0QQitemZ150182165600QQihZ005QQcategoryZ42897QQcmdZViewItem
I'm going to be order lamps and switches from this seller, might as well get the realy/contactors from them too
Well shit... they have the 11p socket and the 11p relay 3PDT - works for me!
gezar still around? the shrapnel available http://www.archivist.info/cnc/shrapnel.html
OK I'm back image at http://imagebin.ca/view/7lN5Wrbx.html
white trace is the f-error
what emc2 ver is that?
I thought halscope looks a bit different on 2.2.2
which one is white? I see blue, cyan, green, red/pink
well the disk image says emc2.2.2-1-ubuntu6 ... i386 it is the only one on my desktop
in AXIS try help/about
err, tkemc has it too I think
try red/pink it looks white to me ... neg slope from 1 to 0
what is the cyan?
cyan is not too useful
let me to to the machine and write them down
along with version
I think the zoom level isn't showing us what happens
2.2.2 halscope has "log to file" button and also labels on the traces
so you don't have the version you think you do
I was also wondering about the labels
yeah I just checked my 2.2.2
I don't remember if 2.1 had those labels
cyan is Xaccel
cradek: you added the labels after 2.1
Indeed I do not have the version I thought I had ... time for much more coffee and a new download
daveengvall__: can you just run the update? you'd have to get it a net connection
[21:17:14] <alex_joni> http://cvs.linuxcnc.org/cvs/emc2/src/hal/utils/scope_disp.c?graph=1
browser connection should not be a problem
daveengvall__: apt too?
what version do you have?
[21:18:29] <cradek> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?UpdatingTo2.2
^ very easy update instructions
hey ... nice tree
this is why we bother people for version numbers all the time - we can see exactly what code they have - very useful for troubleshooting
indeed especially if I get it right ;-)
guess I'd better go upgrade ...
I'm off to another project too, good luck
will that walk on my ~/emc2/configs ??
but you may have to tweak them; see the link at the bottom of that page for instructions/details
daveengvall__: but you'll still be safer if you back them up
I'm off to see the wizard
I'll back them up onto usb stick
thanks for the help I'll be back after I get things going again
* alex_joni will be off to bed by then :)
going, going ... gone
im somewhat happy right now, all the mystery chicken in the freezer has been eaten
i just have a small package of frozen mystery fish to cook and consume and were good to go
new invention called "trash can" for things you don't want to eat
and circular seat for book reading after processing
umm - mine is more oval than round..
emc parts are ordered....
does that mean we get money?
its saturday, time for joining bits together, oops /me has missed shopping for food
alex_joni: I think it means you get to see a lot of questions from Gamma-x
eric_U: I think so too :)
guess you can't run synaptic over a network connection
The program 'synaptic' received an X Window System error.
world lunior canadian hockey champions - junior's Grab another GOLD..... 9 of 11 so far i believe...
eric_U: not sure why that would be
but you can surely run apt-get in a ssh shell
dunno, I better make the long trip to the basement to see what's going on
apt-get update emc2
zat gonna work?
why not :)
yum user here, that's why
apt-get install emc2
emc2 is already at the latest version :)
isn't there a help button in axis?
sorry, i see it
says my version is 2.2.2, I thought there was a 2.2.2-1
2.2.2 is the latest
the package name is 1-2.2.2 or something like that..
is pc speaker a known latency problem?
not to me
LawrenceG: What did you use to draw up those diagrams you showed me?
autocad 14 under vmware
this latency thing is driving me nuts, this mobo shouldn't have any problems
I remember someone talking about a problem with pc speaker
adam1 is online but not answering.... anyone got hs email?
who is adam1?
i search through 2 months of irc logs last night and i got to a point where he found out what to do on my control and enver shared lol.
alex_joni he did a crusader m retro fit with emc.
u sure it's the same adam?
I saw Adam1_ in the logs not adam1
that's the problem, anyone making parts with emc just goes and makes parts
alex_joni i think it was adam1
3 months ago
Gamma-X: maybe SWPadnos has his email..
the kernel that jepler made for gutsy didn't disable the pc speaker.. any time there was a beeb - there would be overruns..
is that what your talking about?
my comp doesn't have a speaker hooked up so I dunno
I unloaded the module, but I haven't tested latency yet
Gamma-X: if it helps: these are some pictures put online by Adam1 I think http://review-space.dgbremner.com/gallery/index.php
looks like he replaced the tachs with encoders
maybe new amps aswell
Gamma-X: I think this is his site: http://dgbremner.com/
there's a location info there
and ways to send email
when I searched for latency, I got a link to the board election
i hope he didnt have to use encoders....
that's a link to a clothing store
eric_U: I am aware of that
yeah y is that? lol
eric_U anything else u came up with? how did u find those pics?
I'm thinking it's not the same guy
eric_U: I bet it is
he said he's from BC
[22:19:52] <alex_joni> http://www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2007-09-28.txt
Gamma-x: does that look like your amps?
I thought he kept the scales thought..
amps are differant
in that post it said that guy sold the servos and amps...
those pictures look like all new hardware
got new amps and servos with encoders...
looks like he sold the new equipment possibly what the hell lol
what's a good alternative to glxgears as a x program?
X? xterm :P
to test latency
but you probably want accelerated..
you can email me at spadnos at sover net
not his hahaha
nope, that's SWPadnos's email :)
that's why I said maybe SWPadnos has it
SWPadnos u alive?
alex_joni: I got no gltext or glxtext
eric_U: apt-cache search glx ?
Damn - too far away http://cgi.ebay.com/Hurco-KM-3P_W0QQitemZ280188552833QQihZ018QQcategoryZ12584QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Adam1_> Adam1_ is now known as MASCanada
lol wat is up with this guy lol
apparently he's hiding from you
good night all
good night alex
anyone have any donator pc parts? lol
I got a 286 moboard somewhere
paid $2500 for it
? what? lol
I have a whole stack of 8088 mobos
whats an 8088 board? lol
wow thats old
don't disrespect my mobo, mofo
yea, when they were the newest thing you paid a lot
not that old
some of us are old enough to have used 8088 pcs
8088 is weak, demand real 8086 CPU power!
ain't that the truth
no 8086 was ever mainstream
I bought my 8088 when 286 wasn't available
I waited for the 286
turbo switch baby!
i had 386
what a joke
true - because it was too high tech just like Intel disabled the Math co when they sold 486SX chips
my first PC was an XT clone, blazing 8MHz
I have a 10mb hard drive for it
I still see the amber glow from the monitor when I try to sleep...
and the burnt in lettering on the monitor
those were the days when you could still keep track of all the available chips
I still have all the DOS Os up to 6.22
* Skullworks-PGAB used a Z80 add in card on his Apple ][.
"I would prefer that people remember the good things about me rather than mourning my loss. (If it turns out a specific number of tears will, in fact, bring me back to life, then by all means, break out the onions.)"
Hail the power of home user CPM
that was the computer _before_ my first PC
I remember those
compiling your own bios put the damper on home pc's for quite a while
I still have it, sitting in the closet
some good sheet metal back in those days
they are where the term Desktop came from because you needed the entire top of a sturdy desk to use one -
heh more old iron collectors
I'm plotting to make drawers out of some
portable was an "Osbourn"
I have some sun workstation cases ready to go
just have to cover some holes and get some slides
hmm I wish I could find a dumpster price deal on some 19" SCSI RAID cabnets...
19" rack mount...
you missed your chance
they have a nice 19" rack at penn state surplus
I passed up some in the dumpster about a year ago
get on the classiccmp mail list
I snagged one of the cooling blowers and am using it on my CNC cabinet
the disk arrays were just too big and too small
6 foot high 19" cabinet, something like 384G
[22:49:14] <jmkasunich> http://jmkasunich.com/cgi-bin/blosxom/shoptask/cooling-02-13-07.html
I was buying CDrom towers (7x units) and swapping out the SCSI 1 cables for U320 LVD - but they take up so much space - I need to move up ( as in vertical)
bridgeport cnc, $24k, reserve not met http://cgi.ebay.com/BRIDGEPORT-CNC-MILL_W0QQitemZ160195133113QQihZ006QQcategoryZ12584QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I'm thinking you can buy that new for $24k with spare change
24K? it better be 24K gold
look at that Hurco KM 3p link I posted earlier
if I spend 24K for something I want to be able to either drive it or live in it
Buy it now price of $2k
those units have beefy ballscrews and a great servo amp
my problem is space
I done filled my basement up with stuff
I live within easy distance of HGR surplus - there are more machines than I can shake a stick at
just no room fo rthem
any new machines, and I have to throw something away
eric_U: the wife?
she gave up
Cool, then you can toss out the bed, and just sleep on the couch
that would probably upset her
* Skullworks-PGAB is waiting for the next wave of the mortgage crisis - then will start shopping for a bigger place.
theres another 120swft for ya
Isn't there an gpl version of Visio ?
or emply vertical storage, I have books directly above my bed
vertical storage is good
hope you never get earthquakes - books are heavy
My banker expects it to start come MAY - April 15 is going to kill some people (financially) this year.
we already rent a storage unit
Skullworks types into the wrong window
jmkasunich, what kind of bandsaw do you have?
harbor fright 4x8 horiz-vert
jmkasunich: you spelled it right!
not really - I need more space to buy machines to play with - I was just stating when I expect "space" to become more affordable and why.
oops, 4x6, not 4x8
Skullworks-PGAB, win the lottery and get a warehouse
or move out in the woods and build one
I saw an old factory on ebay for $200k buy it now
yeah, and then you get the EPA superfund site as a bonus
could be a downside
otoh, the local cleaner was dumping chemicals into the water table for years
I wonder how narrow I can get a timing belt
I have 0.190 between the step pulley on my lathe spinde and the body of the machine
the warehouse option has been considered - except that our local property taxes would hit pretty hard on commercial/Industrial zoned property if it wasn't generating revenue for me.
and I want to drive a spindle encoder
Penn State should be a superfund site, but they don't know how to clean it up
any room to space the pully out some?
you could use a round belt
I've seen that done
no round belt - gotta be a timing belt
gonna use the encoder for threading
people do it with encoders
not saying I would
there isn't any load
ohh, mcmaster has MXL series 1/8" wide
the MXL are power transmission
now I need a pulley I can bore to 1.730, face down to about .180 thick, and press onto this sleeve
might have to use a pulley without the flanges
one needs flanges unless you have a serpentine belt
JMK - can you mount it directly to the rear of the step pully?
I'll use a flanged pulley on the encoder
I wish I remembered where all my pulleys are
Skullworks-PGAB: probably, but this is easier
there is a sleeve that goes between the step pulley and the bearing inner race
goes thru their felt "seal"
sing the final jeperdy song while I look this up...
I can press a pulley onto the sleeve
the sleeve is a slip fit on the shaft, but when everything is tightened up it can't really slip
the bearing adjustment nuts bear on the pulley, which pushes on the sleeve, which pushes on the race
(tapered roller bearings)
crapskies - the largest MXL pulley they have is 1.528 pitch diameter
I'm going to need to do the same thing on my mini mill spindle - I'm going to mount a 3 step timing pulley, and have a additional pulley to drive the encoder.
jmkasunich: are you limited by lenght and have to mount the encoder on the side
this is a lathe spindle, don't want to block the thru hole
know what you mean now
you want a powergrip or poly chain style
for driving an encoder just about anything that doesn't slip will work
even a tiny 1/8" wide MXL series timing belt, 0.08 pitch
I use the xl on my plasma and they are not exact to pitch diameter
for figuring the ratio, only the tooth count matters
pitch diameter is a theoretical thing, no part of the pulley actually measures at that diameter
the math said so many pulses per inch but it was not so
how far off was it?
I had to put a dial indicator on and tweek my ini
brb I'll check
I did too, but I don't think it was the belts
(I have 2:1 XL series belts between steppers and screws)
and I am very sure that if the motor turns 200 times, the screw turns 100 times, not 100.1 or anything
the math said the SCALE should be 3000 but it really was 2970
screw pitch error? (specially if cheap rolled)
no screws xl belts only
in this case its cheap acme
my errors were running something like 0.00003 per inch
in my case it's just a xl belt drive
thats a whole differnet story
belt stretch for example, will throw it off
ok, do you think that you would see the same in your case?
if I have a 70 tooth pulley on the encoder, and a 70 tooth pulley on the spindle, I will get exactly 1:1
BigJohnT, your error will vary with belt tightness as well,
ok i'll watch that
and as it wears
hmm, I'm gonna need a 75+ tooth pulley
the 72 tooth one from McMaster is solid and heavy for the xl I know
XL won't work, I can't get narrow enough belts
in MXL they only go up to 60 teeth
BigJohnT, actually you could self calibrate on a regular basis with some steps per distance between switches test
that's a good idea
cool - econobelt has pulleys up to 120 teeth
throw an error if the rate of change of stretch changes
[23:26:14] <BigJohnT> http://i47.photobucket.com/albums/f163/johnplctech/Plasma%20Cutter/Plasma003.jpg
that's my X axis drive
without the bridge attached
that big pulley is pretty nice looking - most that I've seen are just solid
the belt attachment http://i47.photobucket.com/albums/f163/johnplctech/Plasma%20Cutter/Plasma002.jpg
it "was" solid!
till it took a trip through my CNC BP
cutting down on that inertia, eh
yes, I cut the weight by a lot
doesn't mcmaster sell parts for a setup like that?
as in the end clamps
I made all the parts
[23:28:49] <BigJohnT> http://i47.photobucket.com/albums/f163/johnplctech/Plasma%20Cutter/LimitSwitch.jpg
the corner connectors I made
while I'm showing off http://i47.photobucket.com/albums/f163/johnplctech/Plasma%20Cutter/HPIM0476.jpg
the gecko drives with cooling
jmkasunich: cost = $2
[23:31:45] <jmkasunich> http://jmkasunich.com/shoptask/geckos-heatsink.jpg
Socket A heatsinks after a ride through my CNC mill
darn you beat me LOL
sink from a dumpster
that looks like a drive heat sink
you should see the heat sinks from my robot
you have the best dumpsters
as far as I could tell, they did nothing
the heat sinks in my robot
jmkasunich: what no fans???
not on the sink
10" wide by 30" but not attached to any heat source
its positioned in the cabinet to it catches some breeze from the main blower
[23:34:35] <jmkasunich> http://jmkasunich.com/shoptask/box-02-13-07.jpg
probably don't need a fan
air enters thru the filter, and goes left and right under that steel plate
the left half goes up the left sidewall, between cabinet wall and heatsink fins
eric_U: you are right, natural convection would be plenty with that sink
heat sinks are my friend. we installed a servo drive and in fine print on page 347 there was a note that if you run more than 20% duty cycle you need the optional heat sinks...
JMK - do you have the encoder yet?
I have a box of assorted surplus and dumpster encoders and resolvers
haven't determined if I have one that A) has a suitable PPR, B) I can figure out the pinout, and C) works
I went on a ebay encoder buying spree a few years ago
any chance you could drive the encoder from one of the original gears that drive the acme.
use the gear ratio to figure the drive pully ratio
you mean the original change gear drivetrain?
yeah - if you didn't remove it all
the part thats inside the headstock is still there, the part that was outside is gone
the part thats inside has a two speed + neutral arrangement
gear(s) on spindle, a countershaft with a sliding gear or gears, and the shaft that comes out
I suppose that is a possibility, but it would mean having to leave that stuff in mesh (which makes noise)
very true (noisy)
also don't know if its a 1:1 ratio, which I would need for index
best to drive it directly from the spindle yes?
easy in theroy
BigJohnT: probably, but Skullworks-PGAB's idea is kind of interesting
WORLD hockey championchips Canadian junior's Grab another GOLD..... 9 of 11 so far i believe...
use an inductive sensor to count gear teeth
or a tcho above it..
counting gear teeth doesn't give me quadrature, and is relatively low resolution
looks like the stud gear turns either once per 2 spindle revs, or once per 4, depending on the gearshifter
so it could work
I have what I think is a 1250 PPR encoder with a 1/4" shaft, A, B, and index
probably 5000 counts per rev, or 20K counts at 240 RPM
just get a ecoder disc with 2 or 4 index lines
Skullworks-PGAB: or wait an extra rev or 3 for the index to come around
waiting is easier
as long as I'm counting in software, the 2:1 or 4:1 reduction is probably a good thing
I might drive it off the stud gear for now, and switch to 1:1 belt drive once I start using the 5i20 and counting in hardware
lash in the geartrain bothers me, but in reality it doesn't matter - you don't reverse while threading
what tooling are you using?
HSS lathe bits so far
might get some carbide eventually
carbide screw cutting tips are luvly
yea I love them
beats grinding them by hand
I've done almost no threadcutting, because the shoptask makes it such a pain
I use the partial thread inserts
more cost effective
don't you need a different one for each pitch you want to thread?
not with the partial thread ones
they cover a range
2 inserts covers most
they thread nice
got them from MSC
dang, where'd I put my calipers
in the drawer...
I want to order this set for my 7x10 mini lathe
[23:57:11] <Skullworks-PGAB> http://www.littlemachineshop.com/products/product_view.php?ProductID=2461&category=-419988835
they also have a size for your combo machine
ok, I have a 12mm shaft, 9.2mm long, with about 14mm of M10 thread sticking out beyond the 12mm section
I have a phase 2 QC toolpost already
Skullworks-PGAB: I don't care much for the piston QC tool posts not too repeatable