Re: [CAD_CAM_EDM_DRO] Stepper motors for mill/drill & source of supply?

Yes the ballscrews are ~90% efficient whereas acme leadscrew is at best 45%
efficient. But since the pitch was wrong on the Chinese made acme lead screw
I would say you were luck to get 30% efficiency. As a matter of fact, I
measured the pitch error as .001 per inch.
I used Mcmaster-Carr ballscrews 5/8D .2" pitch. When I got them they turnout
to be Thompson ballscrews however I have seen the equivalent in NOOK
ballscrews and think they are even better. With ballscrews and a 2/1 ratio I
get 180 IPM using servo motors. With stepper motors I was getting 60 IPM as
I recall.
Dan
-----Original Message-----

>
>Hi Dan, I have 300 oz in steppers on my mill/drill with acme screws and it
>seems to be working pretty good so far. I'm using a 2:1 belt reduction as
>well. Are you saying the ball screws take less power to drive even though
>they have twice the pitch? The finest pitch I've seen in ball screws is
>.2". I've been thinking about converting to ball screws to reduce the
>backlash but wasn't sure the motors would be powerful enough since the

pitch

>would double. Which screws did you use?
>
>Joel
>