RE: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other screws!

Andy,

Not sure - maybe he was getting initial resistance from the servos and
not actually from the ball screws?? I do know he was comparing a
(large) CNC mill to a manual Bport.

George


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Andy Wander
Sent: Monday, September 19, 2005 6:05 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: RE: [CAD_CAM_EDM_DRO] Rolled vs. Ground ballscrews or other
screws!

I don't have any direct experience with that, but I would bet against
it.

I could be wrong.

Conventional wisdom is that ballscrews will have something like 1/4 of
the friction of an acme screw, IIRC.

Of course, you will usually have a ballscrew with a faster pitch than
the acme you are replacing, and so the table, carriage, whatever will be
moving farther for each turn of the handwheel.

Andy Wander
Verrex Corporation