hot dang - I just found something I didn't even know I had
in Dad's toolbox, a 1/8" dia x 2" long carbide boring bar
can't bore a 1/8" hole with a 1/8" bar, but it will do nicely for 3/16
be very careful - breaks very easily
strange plan for holding it - I have a boring block, fits on top of my toolpost, and has 1/2" and 3/4" holes in it
I also have an ER collet chuck with a 3/4" straight shank, and a 1/8" collet
that will do it
descisions decisions - do I get sidetracked converting this one to 3/16" or do I stick with the program and work on the 1/8 that I actually need
should do the latter I think
when you get to the same point with both it is a simple matter to bore 1/8 and then 3/16 - just before you slit them
assuming I do the 1/8 the same way I did the first one
I don't have anything that will bore that small, even my smallest endmills are 1/8"
do you need a 5/32 and 7/32 also :)
will making the 3/16 help with technique for the 1/8?
find a dull (broken) 1/8 end mill and grind clearance on one side
jtr: depends - if I do the 1/8 by making the hole first and then turning the OD concentric to the hole, no
if I make the outside first, and then bore it, yes
the other problem with boring is it will be only as concentric as my lathe spindle, which isn't great
what is the collet going in?
if I put it on an arbor with a center hole, I can do the work down near the tailstock on a dead center
400W 48,000 RPM spindle
originally a die-grinder kind of thing, I'm hoping to do both toolpost ID grinding, and fine milling like PC boards
I see - you cannot drill and bore and ream the hole in the spindle you will use it in
I can turn the spindle down some, maybe to 10,000 RPM
[00:10:25] <jmkasunich> http://ukptocs.bosch-pt.com/boptocs-uk/Product.jsp;jsessionid=0EFEF165822E3CFA01AD71A6326F7580?division=iw&ccat_id=9749&prod_id=6328
that is the spindle
and this is the business end: http://jmkasunich.com/pics/bosch-collet-1-2611.jpg
Anyone know anything about AMD CPU's? 1.90 GHz AMD Athlon 64 X2 Dual-Core Processor TK-57 --versus-- 1.90 GHz AMD Athlon X2 QL-60 Dual-Core Processor
darn - even at 10K and 1/8", that is 327 sfpm
I'd need carbide to bore it
I bet a high speed end mill will bore it taking a very light cut and not very deep - you could then ream it by turning the spindle by hand or rig up a pistol drill and rubber band
bbl - got to go
can I do "floating" reaming, where I hold the reamer in my fingers and let it self-align?
hm, I see that "split nut" is not what I meant ... jtr is probably right
there is more than one type of 'split nut' - one with an axial split - clamped tighter to reduce the pitch diameter
and another that is actually two nuts mounted together to be able to adjust the pitch between them
that's how the plastic acme nuts I have work
plastic works well that way - it will conform nicely
the cincikins comps on all positions on the table
I am a happy camper
I will post video tomorrow
I am working on interp_convert.cc to get the W and Z working like I want
I saw that when I read back - not sure what the right answer is
:) the right answer is 'what I want' :)
the interp itself really doesn't know about TLO
I mean the best way to get what you want
rats - I want cheap - easy - fast
the interp make decisions about w-tool-length so it has some knowledge of TLO
yep I was wrong
I will mark this day on the calendar :)
the TLO is in the interp state (settings->tool_Xoffset)
I can see this "should" work pretty easy with A0 B0
are you going to have convert_tool_length_offset() issue an extra move?
no I was planning on changing the assigns at the end of the function according to the status of the w-tool-length
I have a bad feeling about that
an extra move may be a better deal - the way it works now is you command a -w and +z and the machine does not move just the displays. I haven't tried this with AB not zero. I will try that tomorrow
you can g90 or g91 and g01 or g00
the machine does not move - just the displays
right, with AB zero, it won't move because Z,W are the same direction
with A or B nonzero you will get motion
I will try it and see
I am going to the shop right now to try it - bbl
don't you ever go home?
I wonder if "to the shop" was "from my office" or "from home" ?
iirc, shop and home were not at all near each other
i was at home
I got ZX motion with B at -30 - the axes moved over and down and then back to the same vector with the W and Z exchanged
the way it is now I can make it work but I will need to know the exact tool length and have that value in the program - if I change tools I will have to change the program.
if I can make it work with A0B0 that will work for now. I will work on being able to do offset changes at any angle later
I don't see why that would be
if you load the tool somewhere above the work, then apply G43, then back to the work with G0 X... Y... Z0 W0, you'll get straight motion that applies the offset during the move
the program doesn't need to know the tool length
yes - I agree - won't I get motion if I don't match the tool length to the motion command - I will try it
yes you will get motion, but it will end up with the tool tip in the right place
yes - I get motion - for a normal mill with more Z travel and usually shorter tools this is not a problem. This machine has 14 inches of Z travel and many times I have tools more than 10 inches long in it. This requires three or four commands to move Z down a little bit, move W up a little bit, move Z down and then move Z up again.
the tool tip is in the right spot then but it has been a hassle
no, maybe I am missing something, but if you move them together it is not a problem
say clearance plane is Z0.1
if you G43 then move to Z0.1 W0, it will go there in one shot, in a straight line
I will try it - btw: feed hold doesn't work in MDI - how do I stop an MDI command?
hitting escape will abort it
jepler: if you can add a second block and nut insert, you will have the second type of split nut stustev mentioned. you'll have differential threads, too.
yes - it goes to Z0.1 in a straight shot - canceling is a little different - if your Z move is not more than the tool length the motion is down - not a good thing - if your Z move is too much the machine doesn't move and gives an axis over travel warning
having the axes invert position by the exact and opposite magnitude is much better - no motion
cradek: enough about me - how is your lathe coming this evening?
going ok - I made a few more test parts
are these imaginary or do you have pictures?
it was fun to see it run a whole program - drill, bore, turn, part
they are very uninteresting - aluminum rings
I like watching lathe work the best - seeing the shape of the parts emerge from the stock is nice
also it extends the part chute, parts, part drops onto ways below part chute, then the part chute retracts
it is adjustable :-)
isn't the chute supposed to catch the part?
no I think it's just for decoration, while the part drops next to it
nice - I have seen lathes like that before
internal and external indexable threading kits cost a fortune.
yeah - I heard comments like that before
jmk - what happened
I made three blanks with nice accurate 0.125 holes in them - that part is fine and I haven't ruined them yet
then I started making an arbor
got it almost turned down to 0.126, and I oopsed and the tool dug in
now I have a nice bent arbor, and need to start over
that is for non concentric parts
I'll save it for the next time I have a batch of those
paste an insert on it and you will have a fly cutter - always a positive
got any inserts that will fit on a 0.140 diameter bar?
the ease with which that bent doesn't fill me with confidence in this approach
1/8 is pretty small
it will bend just as easy when it is carrying the collet blank
will you have a center supporting it on the end?\
yeah, thats the reason for the arbor
have some drill rod? 1/8 dowel pins?
a dowel pin 'dead arbor' like you mentioned earlier?
unfortunately a pecularity of the shoptask is that you can't get the tailstock very close to the headstock without trapping the table
a real lathe runs the tailstock on its own set of ways
my part is only 1" long, but I can't just make a 1.2" long arbor and run it between centers
going home - see you later
my plan was to have an arbor about 3" long, with most of the length a bit larger (I started with some 7/32 drill rod)
collet blank on the tailstock end - the tailstock has less runout than the spindle
live center is a couple tenths, dead center zero
I have to turn the arbor, so its OD is concentric with the center hole
unless I use a dead arbor
one of my blanks isn't horrible as is - the hole is centered within 0.0003 at one end, and about 0.0007 at the other
the other two stink
0.003 and 0.007 on the one, and 0.005 and 0.009 on the other
wow, why are they so bad?
they were just drilled and reamed - drills don't center, and they definitely don't go straight
I center drilled, then drilled 0.109, 0.120, then reamed 0.125
my goal was just to get accurate size holes, then spin around the hole and turn the OD concentric
if I had bored a starting hole they would have been much better at the start end, and somewhat better at the exit end
stuart was probably right - make the blanks (OD) first, then bore them in the actual spindle
which means I need to make a mount for the spindle (which I was going to have to do anyway), and come up with a freaking tiny "boring bar"
how deep does the bore (grippy part) need to be?
woo that's deep
I could make the nose shorter I suspect - the only thing out there is wrench flats
I could probably get the bore depth down to about 0.3"
which is less than 3:1 depth/diameter
I don't know what collets usually have
these are weird collets (with the wrench flats out front)
the 3:1 ratio comment wasn't about collets, it was about boring bar stiffness - 3:1 is doable
I have a feeling I'm going to be disappointed when I get the collets made
the tool was intended for hand use, and I think the spindle itself might have close to 0.001 runout
it only has two bearings, and they aren't angular contact or anything special like that
they are lightly preloaded by a spring
is there a way to compile modified .c and .cc files without recompiling the whole of EMC? I modified interp_convert.cc. It seems as if I have to do 'make -B' to compile it. I am impatient.
I think I know what I need to do. I will try it in a minute.
make noemally does just compile the needed, but it still has to link the whle pile
yes, normally after modifying one or more files you just type "make" and it rebuilds what is necessary
is there a reason you don't think that make without "-B" (which I don't think I've ever used!) doesn't do what you want?
ive never used -B either
(after "touch"ing interp_convert.c it takes about 2 seconds to finish a 'make' here)
argh I should go in to the office
jepler: good morning - I figured it out - I work in interp_convert_stuart.cc - then I copy it to interp_convert.cc - I forgot to copy it - make didn't touch it until I copied it over - the last statement of my first post says it all. I should have waited to think about it a little before crying wolf. Thanks - takes about 15 seconds here (if done correctly)
stuste1: yes, that's a somewhat atypical way to work, and 'make' can get confused by it.
make wasn't confused - I was - I copy the original to XXXXX_orig.XX - that way I can easily return to the original file after I have 'worked' on the system
I think I will point him to the email list.. ;)
sounds like he means he wants kinematics
.. but it's hard to tell
just a bit
"Crossbar engines" is a very strange term
he is from Uzbekistan
jepler: or tool comp.
I see A is the distance from the origin, but I don't recognize B,C equations
I can't guess what he's trying to do
heh crossbar engines, awesome
skunkworks he pm'd me the same question
BigJohnT: interesting.. I pointed him to the emc_user list
I told him I didn't even have clue what he was asking :)
but maybe someone on the list will ask the right questions :)
are there any other good general machining/metalwork channels out there?
dunno but we do natter about machining as well in here
practical machinist is my fav forum dunno about any IRC channels
BigJohnT: has the search quit working on the practicalmachinist forum?
or is it just me
skunkworks_ dunno I haven't used it in a while
doesn't work for me either
does Jon E ever come here? he may be interested in IBM's OpenCV from sourceforge http://sourceforge.net/projects/opencvlibrary
nice tomp, I may need that for tool positioning
cinci ball test on youtube: http://www.youtube.com/watch?v=Nn1bJ3YAQdI
holy crap.. that is awesome.. I was really wondering what you guys where talking about..
is it supposed to make that banging noise? bam bam bam bam
(I assume that noise is something else going on in the shop..)
I know the video is riveting, I was asking about the noise
I think that should go into the quotes
a part is being riveted behind the camera :)
you need to show off some 5 axis parts being cut with it later ^_^
we will - for sure
stuste1: spindle fixed?
yes - spindle is running
not in this video but it is working
I just saw the fastest toolchange on a video I've ever seen
if you could see it i cant imagine it was that fast
* archivist_ub notes the drip onto the dti at about 3.15 secs in vid
[18:36:08] <anonimasu__> http://www.youtube.com/watch?v=4XYakTeQahA
stuste1: that's very nice. congratulations.
thank you very much
the dancing cinci !
archivist_ub: this is an old slow messy oil leaking coolant flinging hunk of iron
that was all done in rapid traverse feed rate
thats going to eat metal soon
* anonimasu__ has been looking forward to seeing emc make some impellers
rapid is a relative term
being fast is not its job I think.
no more like being heavy is it's job
seeing the spindle motor on top, I would stand well back when it throws chips around
they will be large and hot
wow, thats a helluva machine tool. i still dont get the ZAB construction, looks like a backwards Jhead in the slot, and the slot pivots on that fan shaped backplate, but cant see the Z clearly ( i can see the spindle move up but not how it moves up )
anonimasu__: hahaha wtf was that
like prob half the toolchange time its waiting for the changer doors to open =\
it's the fastest I've seen
[19:19:21] <archivist_ub> http://www.youtube.com/watch?v=L5aC5Kpvibc&feature=related
As this has always bugged me.... http://www.youtube.com/watch?v=G5bXb8l52yk
I'll have to check it out when I get home
tomp: the Z axis is behind the fan way the B axis rotates on
stuste1: is it setup the way you want it?
yes - this will make parts as it is - and do a very nice job - the point of diminishing returns is very close
I want to do a few things but what I want to do has more to do with the control side and not the machine
wie heeft er ervaring met emc2 en blender?
check out the CNC TOolkit
It doesn't work with Blender, but I think it may be close to what you're asking for
(I don't speak or read Dutch, so I'm not sure ;) )
there is an .stl out in blender.
the word is getting out.. ;) http://www.cnczone.com/forums/showthread.php?t=24817&page=5
it's nice that alot of people throw random things aroun..
that they have no real clue about :p