Question for Jon was Re: Servo size for Bridgeport?

> I'm using 1/8 Hp (continuous) rated servo motors with a 2.5:1 belt

reduction

> on 5 TPI ballscrews. That is about 4.5 In-Lb at 1725 RPM (72 In-

Oz), the

> continuous rating. With my servo amps, I get about 300 In-Oz from

this,

> and can do rapid feeds over 100 IPM. It has enough power to snap

off a 3/8"

> end mill in a non-rotating spindle without faulting the servo. (I

did this

> while jogging carelessly during setup and rammed a clamp bolt into

the

> tool.) The calculations I did at
> http://www.timgoldstein.com/cad_cam/motor.htm
> show it can deliver about 1000 Lbs force to the table.
>
> Jon

Hi Jon,


The Servo's I have are AMETEK. There is no HP values given on the
name plate.
There is just the following:
38 VDC nominal
Peak Current Rating 12 Amps Max.
They were sold to me as having 600 oz- in. capacity.

Are these big enough?

Thanks.
Wally

P.S. I will try to make some sense out of the math as soon as I can.