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
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