RE: [CAD_CAM_EDM_DRO] Thoughts on PC Based Control Retrofit....pictures of the specimen

> -----Original Message-----
> My mistake was to use the whole coils rather than half. Still with
> 72V/10A drives I got 54ipm on X,Y, and Z. Unfortunately (actually it IS
> fortunate), the machine is gone, the new owner is happy, and sleeping
> dogs will be left to lay where they are...

In that case I would say that 80 + IPM range is realistic with Gecko G210's
on 1/2 coil. This is sounding better all the time.

> What is the "NEMA 42 modification" ?

Mariss says that the drives monitor the motors to provide the midband
stabilization. On a NEMA 42 the signal they are watching is so much greater
than on a smaller motor that it is over compensation. If you specify the
drive is for a NEMA 42 he will add a single resistor chip that adjusts the
gain to a more appropriate value. The downside of the change is that the
motor will not drive a NEMA 23 or smaller properly.

> I spoke with Marty on the phone this evening and I think he could also
> use some recommendations on how to build an inexpensive 80V supply if he
> goes with Gecko drives.

I would actually go with 72 volts to give a little leeway even though the
drives are rated to 80 V. I am planning to use some 48 V 10 amp transformers
that I picked up surplus with a rectifier and a cap. Don't know of any 48 V
units on the market cheaply at the moment, but a pair of 24 V units in
series would work just as well and are easier to find.

I Don't remember the exact value, but Lee (fellow series II owner) mentioned
to me that if you apply 110 V single phase to the big 3 phase transformer in
it outs out something that sounded close enough to be a very usable power
supply.

Tim
[Denver, CO]

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