RE: [CAD_CAM_EDM_DRO] Spindle RPM control

im thinking im missing something... aren't most hobby cnc retro's using some
form of step'n'direction signal? from a parport? is there an existing
circuit to control the vfd from step/direction?--dave l.

-----Original Message-----
From: Jerry Kimberlin [mailto:kimberln@...]
Sent: Friday, September 27, 2002 1:27 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Spindle RPM control


Dave Lantz wrote:

>
> if someone where to make some of these, i, for one would be interested in
> purchasing! if i understand it right, it would be like a gecko 3XX for a
> spindle, right? (but controlling rpm instead of position)--dave l.

Plenty of them out there already. If you have a 3 phase motor
running 220v, you can just use a VFD. These things can be
totally computer controlled as to speed, speed-up rate, slow-down
rate, forward, reverse, etc. You really need a 3 phase motor to
adequately adjust speed anyway, so I don't see why some VFD like
a Hitachi SJ100 couldn't be used.

Maybe using a VFD has already been discounted by those who know
better. I don't know better as yet.... :-).

JerryK

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