ball screw

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ball screw

[′bȯl ‚skrü]
(mechanical engineering)
An element used to convert rotation to longitudinal motion, consisting of a threaded rod linked to a threaded nut by ball bearings constrained to roll in the space formed by the threads, in order to reduce friction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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A ball screw mechanism, consists of a ball screw and a ball nut with recirculating balls providing rolling contact between the nut and the screw.
-Y axis -- The vertical movement of the axis is made by an endless screw with re-circulating ball nut. Programmable speed: Speed 30 m/min.
Beaver will utilize high-strength stainless steel for the ball screw and ball nut to minimize corrosion as an alternative to chrome plating.
The All Whites had an edge in the scrums and both sides generally won their own lineout ball nut Currie had some real pace behind with Andy MacMahon proving a real handful for the Swansea defence.
And for certain special demands, the ball nut can be supplied with silicon nitride balls.
By using balls manufactured from silicon nitride instead of tool steel, microwelding in the ball nut is eliminated.
The primary ball nut included a 17inch diameter mounting flange and involved removing 800 pounds of material to reach the final size.