Re: [CAD_CAM_EDM_DRO] stepper - servo Holding tourque

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.
Thanks for the informative link. I'll be sure to read it through several
times.
Owen

> Well, with a direct drive, you get much higher speeds, and less torque.
> With a 2:1 toothed belt
> reduction, you double the torque but half the speed. Servo motors
> usually have lots of speed,
> so a belt reduction is a good move. Steppers are usually lacking on
> high speed, so direct
> drive may be a much better choice.
>
> If you give me specifics, (motor specs, lead screw TPI) I can crank some
> numbers for you.
> Or, see my page on this at http://www.timgoldstein.com/CAD_CAM/motor.htm
>
> Jon