CAD CAM EDM DRO - Yahoo Group Archive

Re: Re: Low cost Servo Controller

Posted by Jon Elson
on 1999-09-15 13:35:35 UTC
Ray Henry wrote:

> From: Ray Henry <rehenry@...>
>
> Bertho
>
> I spent years keeping up a bunch of Hardinge lathes that were controlled by
> AB 73xx controllers. They used 15 bits from the digital to drive their D/A
> board. That's 1600+ steps plus direction if mscalc works the way I think it
> should.

Actually, 16384 discrete levels, + direction.

> They would do an excellent job on shallow tapers where one axis
> runs very slow compared to the other and on cutting a radius or half circle.
>
> To me that's the critical question. What are the very shallow tapers going
> to look like? What are the four corners (where axis motion slows to a stop
> and then reverses) of a milled circle going to look like? 128 steps are
> more than adequate for the high end of axis motion. Will they be enough
> for the low end of feedrates.
>
> The stg card uses 13 bit for both D/A and A/D. (8000+ levels)

I find very good results with EMC and the STG card, and my servo amps.
I am using 1000 cycle/rev encoders, so I get 4000 counts/rev, x 5 revs/inch,
to get .00005" / encoder count. This is part of the secret.

On my mill, I often bore out circular holes using circular interpolation.
If it is a critical part, I then bore it out to final size with a boring head.
But, just doing the circular interpolation with an end mill gives a VERY
good circle, maybe with a variation in diameter of .002" or so. Most
of that is due to a little bit of backlash in my ballscrews. The results
are VASTLY better than my AB7320 did, but then it was never properly
tuned for my machine. I also now have the following error holding
within .005" all the way up to 105 IPM, with a following error of
about .0005" or so at low feed rates.

Jon

Discussion Thread

David Howland 1999-09-10 12:24:44 UTC Low cost Servo Controller PTENGIN@a... 1999-09-10 15:48:31 UTC Re: Low cost Servo Controller David Howland 1999-09-10 17:07:57 UTC RE: Low cost Servo Controller Andy Olney 1999-09-10 19:34:45 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-10 21:19:13 UTC Re: Low cost Servo Controller Jon Elson 1999-09-12 22:42:24 UTC Re: Low cost Servo Controller David Howland 1999-09-13 13:34:08 UTC RE: Low cost Servo Controller Jon Elson 1999-09-13 14:49:40 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-13 15:26:10 UTC Re: Low cost Servo Controller Mo 1999-09-13 14:31:40 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-13 16:08:55 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-13 18:09:21 UTC Re: Low cost Servo Controller PTENGIN@a... 1999-09-13 16:36:02 UTC Re: Low cost Servo Controller David Howland 1999-09-13 17:41:39 UTC RE: Low cost Servo Controller CG 1999-09-13 18:06:05 UTC RE: Low cost Servo Controller Dan Falck 1999-09-13 19:00:45 UTC RE: Low cost Servo Controller PTENGIN@a... 1999-09-13 21:44:43 UTC Re: Low cost Servo Controller Jon Elson 1999-09-13 22:52:12 UTC Re: Low cost Servo Controller Jon Elson 1999-09-13 23:52:43 UTC Re: Low cost Servo Controller David Howland 1999-09-14 09:03:57 UTC RE: Low cost Servo Controller Kirk W. Fraser 1999-09-14 10:00:49 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-14 10:06:39 UTC Re: Low cost Servo Controller George Potter 1999-09-14 10:41:57 UTC Re: Low cost Servo Controller David Howland 1999-09-14 11:04:16 UTC RE: Low cost Servo Controller David Howland 1999-09-14 11:44:55 UTC RE: Re: Low cost Servo Controller Bertho Boman 1999-09-14 12:21:12 UTC Low cost Servo Controller Matt Shaver 1999-09-14 12:42:53 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 12:58:25 UTC Re: Low cost Servo Controller David Howland 1999-09-14 13:01:16 UTC RE: Low cost Servo Controller Bertho Boman 1999-09-14 12:53:19 UTC Low cost Servo Controller Bertho Boman 1999-09-14 13:05:48 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-14 13:20:37 UTC Re: Low cost Servo Controller David Howland 1999-09-14 15:26:19 UTC RE: Low cost Servo Controller Steve Carlisle 1999-09-14 16:43:25 UTC Re: Low cost Servo Controller David Howland 1999-09-14 15:31:48 UTC RE: Low cost Servo Controller Ian Wright 1999-09-14 15:42:11 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 16:11:54 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 16:20:15 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-14 17:40:37 UTC Re: Low cost Servo Controller PTENGIN@x... 1999-09-14 16:32:29 UTC Re: Low cost Servo Controller PTENGIN@x... 1999-09-14 16:34:15 UTC Re: Low cost Servo Controller PTENGIN@x... 1999-09-14 16:36:36 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-14 18:03:13 UTC Re: Low cost Servo Controller garfield@x... 1999-09-14 18:39:50 UTC Re: Low cost Servo Controller Dan Falck 1999-09-14 18:10:27 UTC RE: Low cost Servo Controller Bertho Boman 1999-09-14 19:09:34 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 23:07:45 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 23:16:59 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 23:21:04 UTC Re: Low cost Servo Controller Jon Elson 1999-09-14 23:42:00 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-14 23:36:26 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-15 03:54:15 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-15 04:00:36 UTC Re: Low cost Servo Controller Ray Henry 1999-09-15 06:19:49 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-15 07:49:52 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-15 07:52:54 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-15 08:16:04 UTC Re: Re: Low cost Servo Controller David Howland 1999-09-15 10:11:41 UTC RE: Low cost Servo Controller Jon Elson 1999-09-15 13:35:35 UTC Re: Re: Low cost Servo Controller F. de Beer 1999-09-15 14:52:43 UTC Re: Low cost Servo Controller Jon Elson 1999-09-15 15:23:54 UTC Re: Low cost Servo Controller CG 1999-09-16 10:02:58 UTC RE: Low cost Servo Controller Jon Elson 1999-09-16 15:39:09 UTC Re: Low cost Servo Controller Tom Kulaga 1999-09-16 17:06:29 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-16 19:40:10 UTC Re: Low cost Servo Controller Jon Elson 1999-09-16 22:40:26 UTC Re: Re: Low cost Servo Controller Dean Franks 1999-09-17 00:32:44 UTC Re: Re: Low cost Servo Controller Bertho Boman 1999-09-17 04:43:03 UTC Re: Low cost Servo Controller Darrell Gehlsen 1999-09-17 22:44:49 UTC Re: Low cost Servo Controller CG 1999-09-18 08:28:21 UTC RE: Low cost Servo Controller Mike Gann 1999-09-18 09:47:15 UTC Re: Low cost Servo Controller Dean Franks 1999-09-18 12:40:43 UTC Re: Low cost Servo Controller CG 1999-09-18 14:23:16 UTC RE: Low cost Servo Controller Jon Elson 1999-09-18 21:03:37 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-18 22:38:48 UTC Re: Low cost Servo Controller Jon Elson 1999-09-18 21:40:59 UTC Re: Low cost Servo Controller Matt Shaver 1999-09-18 22:05:11 UTC Re: Low cost Servo Controller Dean Franks 1999-09-18 23:09:04 UTC Re: Low cost Servo Controller John Craddock 1999-09-19 04:28:15 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-19 04:27:59 UTC Re: Low cost Servo Controller Pete Dunster 1999-09-19 05:48:20 UTC Re: Low cost Servo Controller Les Watts 1999-09-19 07:32:37 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-19 09:28:21 UTC Re: Low cost Servo Controller Steve Carlisle 1999-09-19 09:38:53 UTC Re: Low cost Servo Controller Dean Franks 1999-09-19 11:21:32 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-19 13:28:28 UTC Re: Low cost Servo Controller Jon Elson 1999-09-19 21:49:09 UTC Re: Low cost Servo Controller Jon Elson 1999-09-19 22:05:46 UTC Re: Low cost Servo Controller Jon Elson 1999-09-19 22:25:23 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-20 04:22:28 UTC Re: Low cost Servo Controller Leslie Watts 1999-09-20 12:47:55 UTC Re: Low cost Servo Controller Leslie Watts 1999-09-20 12:59:48 UTC Re: Low cost Servo Controller PTENGIN@x... 1999-09-20 13:55:27 UTC Re: Low cost Servo Controller Bertho Boman 1999-09-20 14:11:43 UTC Re: Low cost Servo Controller Jon Elson 1999-09-20 16:05:20 UTC Re: Low cost Servo Controller Peter Bailey 1999-09-20 16:56:10 UTC Re: Low cost Servo Controller Leslie Watts 1999-09-21 08:17:58 UTC Re: Low cost Servo Controller PTENGIN@a... 1999-09-21 10:04:48 UTC Re: Low cost Servo Controller Jon Elson 1999-09-21 13:03:23 UTC Re: Low cost Servo Controller Leslie Watts 1999-09-21 13:46:58 UTC Re: Low cost Servo Controller Les Watts 1999-09-22 07:25:34 UTC Re: Low cost Servo Controller Jon Elson 1999-09-22 12:18:19 UTC Re: Low cost Servo Controller Stephen Barmash 1999-09-23 17:13:28 UTC Re: Low cost Servo Controller