jepler: one small question
what happens to the pluto driver if there is no python available?
probably the build is broken
but look at me not caring <---
python is part of the base system everywhere we care about
then look at me not caring <--- :O
jepler: if pyvcp is in 2.1, AXIS in 2.1 should probably support it? is that doable?
awallin: yes, and it will
in fact I think that change has already been back-ported in this recent flurry of activity
it already does
awallin: you're the only one behind :P
maybe I'm wrong about it being a part of base debian, but on this bdi4 machine, python2.3 is depended on by the packages bdi-branding and kdebase which might as well be "base"
The bdi-branding thing is a Paul/rayh thing for custom distros for Sherline and Smithy.
hey Ray - do you have any experience with AMC servo amps?
(Advanced Motion Controls)
rayh: there are different brandings for sherline and smithy afaik
the bdi-branding is the generic BDI one
you may be right, alex
I may be wrong :)
I've see a couple in machines, SWPadnos but I've never worked with them.
I have some brushless around someplace.
I'm looking at brush servo amps
My understanding is that AMC makes good devices.
I think a G320 might be a good choice (if stripped of the step/dir stuff)
I'm kind of curious as to whether I can get better finishes with analog amps vs. step-to-servo stuff like the Geckos
I have 3 G320s now, and could do the mod Mariss suggested (to you, if I recall :) )
I suspect so
yeah to me..
You can certainly increase the resolution/accuracy.
the G340 has the biggest issue that it's only PID
not PID FF0 FF1 FF2
I was thinking that. I have 40000 steps/inch on my mill
I'm curious about the continuous-time control of an analog amp
my motors have tachs on them, so I can do true analog amp control, and discrete position monitoring with the encoders
well, an amplifier runs in continuous time, it doesn't need an encoder pulse to be "active"
That is the nicest way to run. You will get the best finish using velocity commands rather than torque.
ok - good to know :)
that was another point for research :)
with a tach you can command very low velocities.
0.001 volt will produce a taper.
yeah. I suspect that'll be limited by the 5i20 (unless I add a good A/D on an SPI port)
Where a step servo like 320 will produce a staircase.
right. I've worked on power supplies that need to ramp voltages over hours, and 10-bit control isn't too impressive to those guys
rayh: mariss suggested a mod to the G320/340 to make it purely analog
lft pin 2 of some chip, and connect that to the analog output
0V = full reverse, 2.5V = stop, 5V = full fwd
or some such :)
but it still doesn't take analog feedback, so it isn't quite right
Ah. There were some inexpensive cards that worked like that.
it just becomes a torque amp, I think (I think the input was a current, but don't remember)
err - the input controls the current
SWPadnos: yeah, and encoder feedback is not taken into account either
right - only in EMC (same as an analog amp)
If I remember the old GE circuit it just used an analog comparitor betwen command and tach.
so the drive will be really stupid :)
no PID, not feedback, no nothing :)
I guess I'll have a look when my GE uSTOR comes in :)
You got a U-stor?
SWPadnos: did mesa say anything about the new 5i20 ?
I will, when the HNC comes in
Ah a 550 control?
alex_joni, not much, except for talking about ethernet
err - I dunno :)
it's big and blue though
or maybe it was gray
how do you know?
Matts got a spare if you need parts
heh - I don't want to move the one I'm buying 8 miles, let alone 500 for a spare ;)
since I plan to rip out all the electronics and stick an EMC machine in there anyway
I've got several spare GE drives that would match it.
those are basically just analog servo amps, right?
or did that unit use PWM or something?
There is a goofy stepper drive that controls the spindle speed.
I wonder if those would work on my Baldor motors on the Bridgeport
I'm not sure if the spindle on this lathe is DC or AC
probably DC, from our past conversations
AC with two belts and two clutches.
would be my bet.
hmmm. would that require a manual operation to change speed ranges?
err - nevermind
There is a center idler with a leadscrew to change speed.
and then low or high speed clutch.
hmmm. I should ask them forthe manuals when I get the machine
it's funny. moving a big machine 10 miles has almost the same complexity as moving one 1000 miles
it's the last 20 feet that make it complex
maybe more with the controller
[22:21:40] <alex_joni> http://www.woodstone-corp.com/images/ms_pallet_jack_lg.jpg
should work for 1mile /day
maybe 3 if you're fit
the one I linked to yesterday: http://cgi.ebay.com/HARDINGE-HNC-CNC-PRODUCTION-LATHE-S-Up-to-seven-avbl_W0QQitemZ200066336883QQihZ010QQcategoryZ97230QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
You can move these things with pipe for rollers.
it's the 3-foot drop from the truck that's hard ;)
SWPadnos: who said anything about a truck?
don't get your toes under it.
I won't get my anything under it
SWPadnos: there are trucks with a small crane in the back
yeah, but I don't have one
maybe I can call one of my national guard buddies and borrow a HEMTT
remember those pictures of folk building the pyramids
oh wait, I don't have any national guard buddies any more ;)
yeah, but there were like a million of them, and only one of me
or a long angled plane
the angle is the wrong way - there's a few hundred foot change in elevation between me and the machine
I'm thinking of two tow trucks. One flatbed and one with a boom (to lift it off)
they have a forklift for loading
it may work with just a flatbed, since they have a winch to control the slide (if they tilt the bed)
There are car haulers where the bed slides back and down to the ground.
yep - one of those. I'm not sure what kind of base they'll have it on. I can probably ask for a 6x6 pallet
4x4 should be enough, angle the ends to make a skid.
that could work
hmmm - do you know the height of the uSTOR? I think it was taller than I am
I've even known guys who will build a roadbed with 2x6 and 2x4 on edge for the sides.
SWPadnos: I just (yesterday) moved a 13" south bend
we hired a guy with the tiltbed car hauler and they made short work of it
spread grease in the trough and you can slide them by hand.
I overbuild when I don't know what I'm doing ;)
the 13" is about 500-800 pounds, right (depending on the base)
everything is cast except the electrical box ;-)
oh - right. I was thinking my friend's 9x36 was a bigger one
they just tilted the bed, and winched it right up
I had it mounted to 4x6 skids with 1/2" lagscrews
yep. and down - that's teh end I'm concerned about
same thing, tilt the bed and winch it down
we were unloading onto a dock, and that made it harder - no gravity to help
I wonder if it makes sense to make two trips - one for the lathe and one for the controller
then you can use a come-along to pull it off the truck
no - prybar to get it up a bit, 1" round bar underneath, roll to back of truck
then forklift the back end onto a low wheeled platform that we had for moving heavy stuff
push it some more, until we could lift the other end onto another platform
then roll 'er away
hmmm - gotta run - the wife is starving (and is pushing me to go out to dinnner, rather than to cook forr her :) )
sounds like a plan
thanks for the info and suggestions guys
I need to finish this wiring
jmkasunich: btw, it looks very nice
on your blog
the wiring today is an outlet in the kitchen ;-)
half the fun I bet
catch you guys later.
jepler: is this all for 'net' ? http://cvs.linuxcnc.org/cvs/emc2/src/hal/utils/halcmd.c.diff?r1=1.100;r2=1.101