RE: Parallel port isolation

Peter

The FRO on the Optistep is nice in that it uses a potentiometer. There is a
firmware problem on the board that causes the acceleration rate to scale
along with velocity. This is not a serious problem if taken into account
when setting the global acceleration parameter. The real problem with the
Optistep is lack of ramping on both jog mode and feed hold. If you have to
hit feed hold during a G0 move you lose position because the motor
overshoots. The Optistep was apparently designed without considering these
effects on 1150 in.oz. motors.

I bought this system with the intention of migrating it to a 3D router once
I get the servo system running again. Thus far, I am not sure it will serve
that purpose either. The Yeager software looks like it will serve my needs
- just need to get more opinions from those who have used it.

Doug

> -----Original Message-----
> From: PTENGIN@... [SMTP:PTENGIN@...]
> Sent: Monday, November 22, 1999 8:05 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] Parallel port isolation
>
> From: PTENGIN@...
>
> In a message dated 11/22/1999 1:57:18 PM Hawaiian Standard Time,
> dharrison@... writes:
>
> << Microkinetics uses keyboard feed
> hold and I know from experience this is not safe >>
>
> Doug,
> The Optistep card has a FRO option which I have on my machine. It does
> not
> take the speed to zero like on many commercial machines. The tap to stop
> is
> not a problem if you can crank down to 25% first. Hitting escape will stop
> it
> without losing position. The continue command works as long as you don't
> edit
> the current part file.
> Peter
>
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
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> bill,
> List Manager