Subject: Re: Ball Screws

From: tonylos <[email-masked]>
Date: 1 May 1996 23:58:43 GMT

>	OK, a followup then: typically how accurate is yer typical Acme 
>screw like that originally supplied with the mill?? I mean, if the rolled 
>screws aren't any more accurate, what's the point? One supposes the 
>reduction of load is significant, which would be important in terms of 
>sizing a motor to drive the axis, but would I really gain *any* accuracy 
>in positioning with a rolled screw??

The reason roller screws are more accurate is because there is much less
backlash. A new Acme screw will wear enough in a short time to produce
a lot of backlash. Roller screws don't have that problem. The reduction
in load to produce movement isn't the point.