Re: [CAD_CAM_EDM_DRO] Servo torque test question

Robert Allen & Marsha Camp wrote:

>
> Did you put servos on a Bridgeport?

Yes.

> What size, or mfg. & model no.? What was the gear ratio?

I used GE 1/8 Hp (continuous rating) servo motors, with the 1/8 Hp measured
at 1725 RPM, a very good match for what I was doing. The belt ratio was
2.5 : 1, and I left it there. This was the axis drive arrangement on an
Excellon PC board drilling machine. I added DC tachometers and replaced
the resolver with a shaft encoder. I had 2 of these axis drives.

Oh, don't worry about the part number, these are 30+ year old motors, and
GE would charge you $1500 at least, because they'd assume you needed
it for an $80,000 PCB drill that went down!

> Who's drive did you use?

I designed and built my own servo amps, because I didn't know what was
available out there. They work very well, but I could have saved a year,
and bought Copley servo amps for what I paid in parts.

See it at : http://ascc.artsci.wustl.edu/~jmelson/Machining.html
in the CNC section.

Jon