Re: [CAD_CAM_EDM_DRO] Higher voltage servo motors with low volt drivers

> >Maybe the other guys can Enlighten me also since I thought Rutex's

reference

> >to Lock Range is really actually called "Error". Right?
> >If you exceed that error limit of +/-128 the driver goes into error and
> >stops. Why set an Error of 30000?
> >Wouldnt this ruin your Product when you find your 0.010" out of spec and
> >your machine didnt even think of erroring???
> >Here is what I'm refering to: http://www.rutex.com/home/servodrv.htm
> >
> >But Rutex comparisons are impressive... I just think that having 30000
> >would actually be a disadvantage.. Right?
> >
> >
> Not necessarily. If the larger following error ocurrs ONLY during rapid
> traverses, and never during cutting moves, it will not affect your parts,
> but allow you to get more speed from the machine during rapid feed.
> This is pretty common practice on commercial gear, and why large
> machine tools have two speed ratings. The lower one is the speed at which
> it maintains some level of accuracy, the higher one is what it can do
> when accuracy is not a concern.

Ok, I understand now. Its pretty much for comfort and ease of use I take
it... If I understand right you can make adjustments to your
Acceleration/Decel.. to maintain a minimum of error without tripping the
Drivers error/stop feature. I guess +/-128 might be a bit too tight for a
Servo that is perfectly happy at 3000rpm..
Later on, when I'm bored with myself, :) can I somehow modify the Error
limit on my G320 to maybe switch to +/-5k when I want to, or is this a fixed
internal IC setpoint? Adding external Circuitry would be easy for me. Just
wondering if its possible? Can it be done??

> Of course, with step/dir drivers, you are running blind, as you can't
> measure
> the following error from the computer. A true closed-loop system, where
> the encoders feed back to the computer, can allow you to have various
> error bounds at different speeds.

If I'm not mistaken EMC could take additional encoder feedbacks from
Step/dir output, right? And use it to make corrections?
Maybe not as true Servo but say maybe making corrections along the way? ie:
when there are load changes..
Yes, I think I posed that as a question. <ggg>

Vince

> Jon
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