Re: [CAD_CAM_EDM_DRO] spinning ball nuts

In a message dated 2/7/2004 12:36:09 AM Central Standard Time,
plastiguy@... writes:
Besides the added design challenge of having the servo motor move with the
gantry that it drives, what snafus might I encounter with this approach?
That "design challenge" will indeed be the "SNAFU"! I still think you will
need AT LEAST a 1.25" O.D. screw! I built such a machine in '86
(126"-"X-screws") and I DID use 1.5"O.D. x ½" pitch ball-screws. Expensive, yes, but it
worked!

The preloaded ("dual") ball-nuts were quite large over the ball-return tubes,
etc., and it WOULD have been a challenge to rotate the nuts instead! You'd
also need DUAL thrust-bearings in addition to the axial bearings, or, just a
pair of angular-contact ball-bearings at each end (facing opposite ways).

Lossa luck! Jan Rowland


[Non-text portions of this message have been removed]