Re: [CAD_CAM_EDM_DRO] Re: 7A, 80VDC 10 microstep drive

Mariss,

One other suggestion. I would like to see a driver for 1/4 step mode.
Microstep past 1/4 step would not help me with my cnc router, as most PC
system would not be able to create the pulses fast enough to move my router
at 400 inches per minute. 1/4 step would be 800 pulses per rev. My lead
screws are usually set for 4 turns per inch. This gives me 3200 pulses per
inch.

Bob Campbell

----- Original Message -----
From: Mariss Freimanis <geckohall@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Sunday, June 11, 2000 4:07 PM
Subject: [CAD_CAM_EDM_DRO] Re: 7A, 80VDC 10 microstep drive


> Bob,
>
> No, the drive does not automatically reduce current. This can be done
> by switching in another current set resistor while the G201 is
> stopped using an opto-coupler whose emitter goes to term. 12. The
> collector would connect to one end of this resistor while the other
> end would go to term 11.
>
> I admit this is rather a kludge; in the next iteration of the board I
> will try to do this internally. Thank you for the suggestion.
>
> I am presently finishing up a design of a brush-DC servodrive (G320)
> that will emulate a step motor. It will be the same package size as
> the G201, and likely the same price. The ratings will be 20 Amps, 80
> VDC, true PID (albeit analog), +/- 128 count servo lock range, step
> and direction inputs, no tach required, pulse by pulse current
> limiting, will power the quad encoder so long as 5VDC current
> consumtion is 50 ma or less, etc. This would place it in the 1-2 hp
> class.
>
> Prototypes will be available for beta-testing end of this month, if I
> haven't screwed up the PCB layout.
>
> Mariss Freimanis
> Geckodrive Inc.
>
>
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