Re: [CAD_CAM_EDM_DRO] stepper - servo Holding tourque

Owen Lloyd wrote:

>Jon,
>my decision to go direct drive was more out of convenience. Since I had to
>make new bearing blocks for my ball screw conversion, I decided to build it
>so the Nema 34 motor could mount right on the end with a keyed female
>coupler. I was intending on using minimum 400 in/oz steppers, though I am
>likely going to purchase the Motion Group
>[http://www.motiongroup.com/cncpkg.htm%5d package with 750 on/in motors. My
>ball screw is a .200 pitch.
>
>

Well, let's see what we can figure out about this system. 750 Oz-In =
46.875 Lb-In. With the .200"
pitch screw, that will deliver 1473 Lbs of linear force. If these
motors drop to 100 Oz-In torque at
some speed, that will deliver 196 Lbs linear force.

The formula is (Oz-In / 16) / (.200/(2 Pi)) = linear force in Lbs.

Jon