CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo

Posted by Les Newell
on 2004-02-11 02:43:21 UTC
Hi Tony,

I have to disagree with this. Steppers aren't like mechanical ratchets,
they are springy. As a simple demonstration put a pointer on the pulley
of a stepper, power up the stepper and try to turn it by hand. It will
move slightly, long before you apply enough torque to make it jump a
step. This always happens when you apply a load to a stepper. It is a
known quantity so you design around it. When you design a servo based
system you have to decide what is an acceptable following error and then
set up the encoder resolution + gearing to suit.

Les


> It is worth remembering that with a servo system, if the motor is moving,
> it is doing so *because* there is a discrepancy between the current
> position and the position that it is required to be in. So with a servo
> system, the only time you know that there is no positional error is when
> the motor is stopped. As you increase the load that the motor has to shift
> (e.g., by increasing depth of cut), the size of any positional error will
> tend to increase.
>
> In contrast, with a stepper-based system, as long as the system doesn't
> lose steps (i.e., as long as the motors are sized correctly for the applied
> load), there is no change in the accuracy of the system as the load is
> increased.
>
>
> Regards,
> Tony
>

Discussion Thread

plastiguy 2004-02-09 18:41:27 UTC stepper vs. servo bull2003winkle 2004-02-09 19:49:34 UTC Re: stepper vs. servo Jon Elson 2004-02-09 21:24:17 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo ballendo 2004-02-09 21:59:06 UTC Re: stepper vs. servo Albee Tang 2004-02-09 21:59:07 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Roy J. Tellason 2004-02-09 22:35:39 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Les Newell 2004-02-10 00:55:07 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo John Johnson 2004-02-10 05:22:09 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo Peter Renolds 2004-02-10 06:01:12 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - H Bridge question Jon Elson 2004-02-10 07:47:46 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Stan Aarhus 2004-02-10 07:49:36 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo ballendo 2004-02-10 07:50:14 UTC DIY servo drive? was Re: stepper vs. servo Jon Elson 2004-02-10 08:02:47 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo bank haam 2004-02-10 09:47:15 UTC Re: [CAD_CAM_EDM_DRO] DIY servo drive? was Re: stepper vs. servo Mariss Freimanis 2004-02-10 11:36:49 UTC DIY servo drive? was Re: stepper vs. servo dchristal2 2004-02-10 13:32:47 UTC Re: stepper vs. servo ballendo 2004-02-10 16:59:46 UTC Re: stepper vs. servo ballendo 2004-02-10 17:02:13 UTC Re: stepper vs. servo ballendo 2004-02-10 17:03:03 UTC Re: stepper vs. servo Roy J. Tellason 2004-02-10 17:51:24 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Jon Elson 2004-02-10 21:23:22 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Roy J. Tellason 2004-02-10 21:42:58 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Tony Jeffree 2004-02-11 02:17:12 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Les Newell 2004-02-11 02:31:50 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Les Newell 2004-02-11 02:43:21 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Raymond Heckert 2004-02-11 19:23:21 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo Robert Campbell 2004-02-11 19:40:12 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo bull2003winkle 2004-02-11 20:35:58 UTC Re: stepper vs. servo Jon Elson 2004-02-11 20:51:18 UTC Re: [CAD_CAM_EDM_DRO] stepper vs. servo Jon Elson 2004-02-11 21:02:29 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo ballendo 2004-02-12 09:03:44 UTC Re: stepper vs. servo ballendo 2004-02-12 09:04:03 UTC microstepping was Re: stepper vs. servo Harvey White 2004-02-12 11:44:40 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Chris Cain 2004-02-12 16:44:15 UTC RE: [CAD_CAM_EDM_DRO] microstepping was Re: stepper vs. servo JanRwl@A... 2004-02-12 20:42:04 UTC Re: [CAD_CAM_EDM_DRO] microstepping was Re: stepper vs. servo ballendo 2004-02-13 06:36:22 UTC Re: stepper vs. servo turbulatordude 2004-02-13 07:26:28 UTC Re: stepper vs. servo ballendo 2004-02-13 07:51:51 UTC microstepping was Re: stepper vs. servo Harvey White 2004-02-13 08:34:30 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Mariss Freimanis 2004-02-13 10:11:40 UTC Re: stepper vs. servo Jon Elson 2004-02-13 10:15:17 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Mariss Freimanis 2004-02-13 10:59:38 UTC Re: stepper vs. servo Jon Elson 2004-02-13 18:46:24 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo ballendo 2004-02-14 07:46:52 UTC Re: stepper vs. servo ballendo 2004-02-14 07:46:53 UTC Re: stepper vs. servo Harvey White 2004-02-14 08:43:17 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo Mariss Freimanis 2004-02-14 12:31:32 UTC Re: stepper vs. servo ballendo 2004-02-15 11:45:06 UTC Chopper methodology was Re: stepper vs. servo ballendo 2004-02-15 11:45:07 UTC Stepper Mid band resonance Help! please... jeffalanp 2004-02-15 12:22:14 UTC Re: Stepper Mid band resonance Help! please... Mariss Freimanis 2004-02-15 13:02:29 UTC Chopper methodology was Re: stepper vs. servo Mariss Freimanis 2004-02-15 13:22:53 UTC Re: Stepper Mid band resonance Help! please... zephyrus@r... 2004-02-15 16:33:25 UTC Re: Chopper methodology was Re: stepper vs. servo Mariss Freimanis 2004-02-15 17:05:54 UTC Chopper methodology was Re: stepper vs. servo turbulatordude 2004-02-15 22:20:30 UTC Re: stepper vs. servo - hundreds of microsteps turbulatordude 2004-02-15 22:40:08 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... Jon Elson 2004-02-16 09:39:54 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - hundreds of microsteps Mariss Freimanis 2004-02-16 10:48:05 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... ballendo 2004-02-16 10:52:22 UTC Chopper methodology was Re: stepper vs. servo jmkasunich 2004-02-16 14:07:51 UTC Re: Stepper Mid band resonance Help! please... Mariss Freimanis 2004-02-16 14:22:28 UTC Re: Stepper Mid band resonance Help! please... jmkasunich 2004-02-16 14:38:26 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... jmkasunich 2004-02-16 14:41:11 UTC Re: Stepper Mid band resonance Help! please... ballendo 2004-02-16 15:25:25 UTC Re: Stepper Mid band resonance Help! please... Jon Elson 2004-02-16 22:01:46 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - Allegro and ignoring the edges.... Mariss Freimanis 2004-02-17 07:14:02 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... turbulatordude 2004-02-17 08:09:24 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... Mariss Freimanis 2004-02-17 09:27:33 UTC Re: stepper vs. servo - Allegro and ignoring the edges.... Jon Elson 2004-02-17 19:28:16 UTC Re: [CAD_CAM_EDM_DRO] Re: stepper vs. servo - Allegro and ignoring the edges....