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

Hi Tim, Matt, Dan,

I don't have the BIG IRON to drive, but I was thinking of finding a
transformer for an 70-80v supply. I have several F204 transformers that
I could hook up in series (tacky!). I'd like to find a better
solution. Did someone mention microwave transformers sometime back? I
knew I should have bid on those ovens!
Dan Mauch (Camtronics) had some power supply kits for servo systems, I'm
checking with him to see what he has.

So I'm looking for a better transformer too.

Alan KM6VV


Matt Shaver wrote:

>
> Tim Goldstein wrote:
>
> > No, the motors do not have any encoders they run open loop. The reason for 6
> > wires is that they were run as unipolar. They will run just fine as bipolar
> > 1/2 coil and you will get better performance. The motors are most likely 8
> > wire motors so you have a lot of flexibility in how you drive them. Matt
> > used some fairly expensive high voltage drives on his conversion. I have
> > tested my series II (like a series I on steroids) with a Camtronics bipolar
> > chopper driver at 24 V and was getting about 30 ipm on the X and Y and 15
> > ipm on the Z. I just ordered a single Gecko G210 with the NEMA 42
> > modification to try and see how that works. Talking to Mariss (owner,
> > designer, promoter, and I imagine janitor) at Gecko he tells me that all
> > else being the same max RPM on a stepper will increase in direct proportion
> > to the drive voltage. The G210's are good up to 80 volts. So, if it works as
> > planned I should be able to get 40 - 45 ipm on the Z and 80 - 90 ipm on the
> > X & Y. Testing will be reported to the group.
>
> 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...
>
> What is the "NEMA 42 modification" ?
>
> 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.
>
> Matt