Re: [CAD_CAM_EDM_DRO] servo motor ID

> Now, is this the MOTOR rating, or the servo amp rating? If your servo

amps

> can deliver 28 A peak, that should be enough to break your ballnut if
> there is a belt reduction from the motor.

Motor amps are 230v.3ph. 20a. (the matching FX-490 amps) And no, this isn't
at home. :)

> If direct drive, it is still a LOT of torque. Is this a standard Series-I

Bridgeport size machine, or something bigger?

It's a retrofitted Moog - the column is Bridgport I, saddle is similar to
Series II, but slightly smaller. No reduction belt drive X,Y,Z (Through side
of saddle). The servos are overkill, but I couldn't refuse them at the price
I paid. The plan is to put them on a bigger machine later.

> I'm using motors good for about 1/2 Hp peak on a Series-I Bridgeport,
>and I deliver 1000 Lbs linear force to the table. I understand for those
> 400+ IPM rapid feeds, you need a lot more.

The saddle slows things down - lots of mass. Like you mentioned, belt break
is at the back of my mind, so I keep EMC limited at the top end of 200ipm on
the Z. (Interesting note - EMC's commanded IPM is usually higher by two or
three IPM than that read directly from the drive...)

- Keith


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