Re: Bridgeport servo motors

I don't understand Jon. I have a peak torque of 600 oz-in
(37.5 in-lb). Are not the commercial retrofits using
about this value as their continuous torque? I was thinking
I need to gear it down to raise my continuous torque, whose
value I do not know.

Also using a heavy belt is bad thing. You want the belt to snap
in the event of a crash.


Scott



-- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:

> Polaraligned wrote:
>
> >Torque constant: 44oz-in/amp
> >Voltage constant: 32.5v/1000 rmp
> >Peak torque: 600 oz-in, or 37.5 in-lb
> >
> >
> 44 oz-in/amp * 20 A = 880 Oz-In, or 2640 Oz-in after the 3:1 belt
> reduction. That is 165 In-Lb of torque at the screw. Assuming a 5 TPI
> ballscrew, this will exert 5189 Lbs of linear force on the table.

Assuming

> a total weight of table, vise and workpiece of 1000 Lbs, it can

accelerate

> it at 5 G!
>
> If you ever have a serious crash with this system, be prepared to dodge
> a flying J-head!
>
> You are going to need a very heavy duty belt to resist this force. It
> is about
> 7 times more force than on my Bridgeport retrofit.
>
> Jon