Re: [CAD_CAM_EDM_DRO] servo motor ID

Keith Rumley wrote:

> > 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.
>
> FWIW - To give an idea of scale, the Emerson DX490 brushless servos on my
> mill are 90in.lbs (4" sqr body) - rated at 240v, 14amp, 3.19hp. (Continuous)
> 180in.lbs peak Peak torque being 2x continuous torque.

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. If direct drive, it is still a LOT
of torque. Is this a standard Series-I Bridgeport size machine, or something
bigger? 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.

>
> You mentioned 25in.lbs to150in.lbs peak = 6x continuous torque. Looks to me
> like it might be 75in.lbs continuous, especially with the 5" case.

6:1 peak:continuous ratings are not unusual for natural convection cooled
motors. When forced air cooling is used, the range narrows.

Jon