RE: [CAD_CAM_EDM_DRO] INCONSISTENT STEPPING - WIERD SITUATION

Jon,

You may be able to shed some light on my problem.

I do a lot of 3D engraving which means my machine is doing a lot of short
moves in the Z direction. After about 10 minutes of operation, my Z height
has moved up by about .020".

I am using the CNC controller from Microsystems. I have also tried it with
cncpro. With cncpro, it goes down about .020".

Bob Campbell

-----Original Message-----
From: elson@...
[mailto:elson@...]On Behalf Of Jon Elson
Sent: Sunday, March 10, 2002 3:49 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] INCONSISTENT STEPPING - WIERD SITUATION


ja_erickson wrote:

> hey all,
>
> ive just wired up one drive on a bridgeport series 1 with
> size 42 steppers using gecko 210 drives. the system is being driven
> by master5 software and is exibiting some strange behavior.
> when im jogging the motor in one direction it functions smooth as silk
> but when i attempt to jog the motorin the opposite direction,the
> motor misses steps, stall and growls.any suggestions

Note that the Gecko drives have funny requirements for the direction
signal not changing for up to 500 uS after a step pulse. Apparently,
for Gecko drives to work correctly, the direction signal should only change
at the beginning of a step pulse. Most software does not generate
the signals like this. Most other drives sample the direction signal
during the step pulse and then don't mind if it changes later. Many
software CNC programs let the direction signal return to '0'
between step pulses, which will drive Geckos crazy in one direction.
That is why I'm guessing this might be the problem. Se if master5
has any info on setting up for Gecko drives.


Jon


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