Re: [CAD_CAM_EDM_DRO] Bearing question for ballscrew conversion

The question of whether to use an angular contact at one end
can be determined by the slender ratio of the screw and the desired rpm.
Very long screws (slender ratio > 40) often benefit from an overconstrained
construction with an angular contact pair at both ends. This is usually
called fixed/fixed mounting.Mounting is not difficult but ballscrew
temperature must be controlled. On the last one I did I use stiff spring
washers on one end to allow for themal growth while constraining bending
moments.

Most ballscrew catalogs have tables and charts to determine the required end
fixity. Thomson comes to mind.

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html

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