#linuxcnc-devel | Logs for 2016-12-29

[08:51:25] <skunkworks> jepler, those little dc servos you put on the Zenbot - we are planning on useing a set of them for one of our little emco lathes. (the cnc version that had the control integrated - pretty worthless as is)
[08:51:56] <skunkworks> 2.5:1 reduction plus 10tpi - they should work way better than the steppers
[08:51:58] <cradek> I have similar on my sherline
[08:52:27] <cradek> they work great
[08:52:38] <cradek> can you get 3:1? that's a coarse screw
[08:52:40] <skunkworks> the pc version have normal single phase induction motor. these cnc versions had a dc spindle
[08:53:05] <skunkworks> cradek, not very easily
[08:53:09] <skunkworks> it is a ball screw
[08:53:20] <cradek> ah
[08:53:21] <cradek> neato
[08:53:34] <skunkworks> it is 10.mumble tpi (metric)
[08:53:46] <cradek> mine are 1mm pitch (!) probably triangular thread
[08:54:58] <skunkworks> I remember it from one of the fests.. I think you where still using the printer port to run it
[08:55:26] <cradek> yeah I did that for a while
[08:55:50] <cradek> I had a divider made of an avr that read quadrature and generated lower resolution quadrature so it was slow enough for the parport
[08:55:56] <cradek> ridiculous and effective
[08:56:13] <skunkworks> I remember that too :)
[08:56:57] <cradek> ugh, driving servos from pwm on the parport
[08:57:08] <cradek> it's surprising it was usable, but it was
[08:57:48] <skunkworks> the steppers that are on it work but barely.. they are 72(?) steps per rev - not hibred (no magnet in the center)
[08:58:31] <skunkworks> I remember being very suprised how well it works - you had like 10 levels of pwm
[10:45:47] <andypugh> cradek: There was a guy driving Fanuc servos using the parport and the bldc component with software PWM. Only as an experiment, as far as I know.
[10:49:41] <cradek> can't be very fast...
[10:51:11] <andypugh> https://www.youtube.com/watch?v=l-MNy6-QanI
[10:52:12] <andypugh> Watching it, he is actually only using the parport to convert Fanuc or Hall signals.
[10:54:04] <linuxcnc-build> build #4671 of 0000.checkin is complete: Failure [4failed] Build details are at http://buildbot.linuxcnc.org/buildbot/builders/0000.checkin/builds/4671 blamelist: Chris Morley <chrisinnanaimo@hotmail.com>
[18:42:02] -linuxcnc-github:#linuxcnc-devel- [13linuxcnc] 15sleepybishop opened pull request #220: fix logging messages for hostmot2 uart module (06master...06hostmot2_uart_fixes) 02https://github.com/LinuxCNC/linuxcnc/pull/220
[22:16:47] <skunksleep> These pittman servos have a peak torque of 62 in-oz. Cont of 10 in-oz
[22:19:52] <skunksleep> 28w continuous