CAD CAM EDM DRO - Yahoo Group Archive

RE: [CAD_CAM_EDM_DRO] Re: General Question REgarding Stepper vs. Servos

Posted by Tim Goldstein
on 2003-06-26 11:11:59 UTC
Charles,

No, closed loop has nothing to do with it. What you have to have is a
DOS program that is using a virtual port and not direct port access.
There are some 3rd party applications that will allow you to access the
port from a command shell (it is really not DOS, but a virtual DOS
emulation. Way off list and too nerdy to get into it here, but trust me
it is not DOS), but they have very high latency. Now closed loop and
high latency is a bad thing. You have the software correcting position
in real time and a queue of position change commands that have not yet
been sent to the drive. Causes great instability.

Apparently what you are doing is working for you and you are happy with
it. I would not recommend a DOS program under any of the NT based
operating systems as a general rule.

Tim
[Denver, CO]
Sherline products at Deep Discount
Mach1 & DeskCNC with credit card ordering
www.KTMarketing.com/Sherline


> -----Original Message-----
> Hey Tim, I AM running a DOS program through WinXP without errors -
> no program errors, no machining errors. I have access to my
> parallel port, the encoder and the motors. I believe, but am not
> absolutely sure, that a closed-loop system is a necessary part of
> this type of setup. Refer to message 62087 and subsequent threads.
> Thanks Charles

Discussion Thread

Statman Designs, LLC 2003-06-26 07:15:33 UTC General Question REgarding Stepper vs. Servos Markwayne 2003-06-26 07:50:12 UTC Re: [CAD_CAM_EDM_DRO] General Question REgarding Stepper vs. Servos Charles Hixon 2003-06-26 08:01:08 UTC Re: General Question REgarding Stepper vs. Servos Tim Goldstein 2003-06-26 08:05:15 UTC RE: [CAD_CAM_EDM_DRO] General Question REgarding Stepper vs. Servos Tim Goldstein 2003-06-26 08:13:05 UTC RE: [CAD_CAM_EDM_DRO] Re: General Question REgarding Stepper vs. Servos Les Newell 2003-06-26 08:36:36 UTC Re: [CAD_CAM_EDM_DRO] General Question REgarding Stepper vs. Servos Charles Hixon 2003-06-26 09:25:09 UTC Re: General Question REgarding Stepper vs. Servos Tim Goldstein 2003-06-26 11:11:59 UTC RE: [CAD_CAM_EDM_DRO] Re: General Question REgarding Stepper vs. Servos Charles Hixon 2003-06-26 11:44:06 UTC Re: General Question REgarding Stepper vs. Servos JanRwl@A... 2003-06-26 14:18:25 UTC Re: [CAD_CAM_EDM_DRO] General Question REgarding Stepper vs. Servos Jeff Lionberger 2003-06-26 15:20:00 UTC Filter or converter for converting short lines to arcs IMService 2003-06-26 16:26:37 UTC Re: Re: General Question REgarding Stepper vs. Servos fortino 2003-06-27 08:20:47 UTC Re: [CAD_CAM_EDM_DRO] Filter or converter for converting short lines to arcs Torsten 2003-06-27 09:33:04 UTC Re: Filter or converter for converting short lines to arcs Charles Hixon 2003-06-27 09:51:02 UTC Re: Filter or converter for converting short lines to arcs andyolney 2003-06-27 10:19:35 UTC Re: Filter or converter for converting short lines to arcs Marcus 2003-06-27 10:56:46 UTC Re: [CAD_CAM_EDM_DRO] Filter or converter for converting short lines to arcs Alan Marconett KM6VV 2003-06-27 11:28:23 UTC Re: [CAD_CAM_EDM_DRO] Re: Filter or converter for converting short lines to arcs Fred Smith 2003-06-27 11:51:36 UTC Re: Filter or converter for converting short lines to arcs Charles Hixon 2003-06-27 13:54:28 UTC Re: equation for locating the center of an arc knowing three points Alan Marconett KM6VV 2003-06-27 16:21:51 UTC Re: [CAD_CAM_EDM_DRO] Re: equation for locating the center of an arc knowing three points Kim Lux 2003-06-27 16:40:44 UTC Re: [CAD_CAM_EDM_DRO] Re: equation for locating the center of an arc knowing three points Charles Hixon 2003-06-27 18:42:20 UTC Re: equation for locating the center of an arc knowing three points R Petersen 2003-06-27 18:45:08 UTC Parker systems Jon Elson 2003-06-27 19:25:38 UTC Re: [CAD_CAM_EDM_DRO] General Question REgarding Stepper vs. Servos Bill Price 2003-06-27 19:54:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Filter or converter for converting short lines to arcs Charles Hixon 2003-06-28 06:40:50 UTC Re: Filter or converter for converting short lines to arcs Mariss Freimanis 2003-06-28 10:51:35 UTC Re: General Question REgarding Stepper vs. Servos Raymond Heckert 2003-06-28 18:00:00 UTC Re: [CAD_CAM_EDM_DRO] Re: Filter or converter for converting short lines to arcs Charles Hixon 2003-06-28 19:47:46 UTC Re: Filter or converter for converting short lines to arcs Jon Elson 2003-06-28 21:43:44 UTC Re: [CAD_CAM_EDM_DRO] Re: General Question REgarding Stepper vs. Servos Jeff Lionberger 2003-06-30 09:50:29 UTC [CAD_CAM_EDM_DRO] Re: Filter or converter for converting short lines to arcs