Re: [CAD_CAM_EDM_DRO] servo motor ID

"Carey L. Culpepper" wrote:

> I purchased a servo motor setup for J-head Bridgeports on Ebay recently.
> Motors, mounts and belt drives for x-y axis. The price was to good to
> pass even though I already have retrofitted the machine with nema 42
> steppers with encoders.
> The motors are EG & G Torque Systems. The model numbers are
> MT-5330-111EV code 1003. I have been doing some internet searches to
> try and get some specs on these motors. My searches for EG & G have
> given me a company that is a defense and customs contractor. The company
> logo is the same that is on the motors.

E G&G is a HUGE conglomerate, with defense, other federal, aerospace,
and industrial customers. If you see a strobe light on an airplane flying
at night, that's an EG&G part.

> No mention of any products. Did
> this company sell out that part of their business? The motors have
> Watertown MA. on the label under the logo.
> Futher searches led me to a "Torque Systems" site. A search of their
> product line found a "5330" which matches the physical diameter of the
> motor at 5". This listing yielded these specs: 170VDC max-3000RPM no
> load- 25lb. in. torque rating- 150 lb. in. peak torque. No current
> ratings were listed.
> The EG & G motors have tachs with encoders. The encoders were removed
> and mounted on the leadscrews.
> Anyone familiar with these motors? Can I drive them with Gecko drives
> (they are permanent magnet brush motors).

Sure. The only problems are you won't get full RPM, and you have no idea of

the current needed to get 150 In-Lb peak. You could actually use an arm an
spring gauge to determine what current delivers the peak torque. But, most
likely, it will be more than the Gecko will allow, anyway. We can figure
you'd
get just about half of 3000 RPM at the Gecko's maximum voltage. 1500 RPM
is still fast enough you can probably use a 2:1 belt reduction ratio and get

a decent rapid feed rate. 150 In-Lb is a HUGE amount of torque, probably
enough to break things in the machine. It will certainly break good sized
toothed belts.

Jon