Re: Jittering and jamming of stepper motors

["Darrell" <dgehlsen-at-earthlink.net>]

If you are getting 40 IPM with the Bridgeport motors, you are doing good. Jitter
in the step pulses above 40 IPM is greater than the instantaneous move
capability of the motor so it stalls.

Darrell

http://www.machinemaster.com


----- Original Message -----
From: "Belal Mohammad Hashmi" <belal.hashmi-at-nu.edu.pk>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Tuesday, November 13, 2001 1:49 AM
Subject: Jittering and jamming of stepper motors


>
> I have installed emc with redhat 6.2 on a HP KAYAK PII 233 mhz machine to
> control a bridgeport series I CNC. (got it up from scrap). I am using
> stepper motors with freqmod.o. The motors do good, but at about 40ipm they
> jam. what may be the problem. Period is set at 20, Prop gain=70. I,D gain=0
> Velocity forward gain is 1.0 all other are 0. There are no following errors.
> The steppers work fine through a signal generator upto 10k steps/sec. What
> may be wrong?
>
> Belal.
>