Re: [CAD_CAM_EDM_DRO] INCONSISTENT STEPPING - WIERD SITUATION

Surprisingly enough I have had this complaint before. It is usually the
step/dir pins being swapped or the polarity is wrong. Gecko's do indeed need
special handling of the DIR bit ( Actually, it must be held on as long as
the multiplied pulse train) but Master5 takes this into account. (Couldn't
have it NOT run Marisses drives..that would be kiss of death).

Try swapping step/dir or polarity and see what happens.

Good luck,
Art
Master5 Software
http://users.andara.com/~fenerty/master.htm

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, March 10, 2002 6:48 PM
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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