出典:Wikipedia
出典:『Wikipedia』 (2011/02/08 06:03 UTC 版)
A ball screw is a mechanical linear actuator that translates rotational motion to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which act as a precision screw. As well as being able to apply or withstand high thrust loads, they can do so with minimum internal friction. They are made to close tolerances and are therefore suitable for use in situations in which high precision is necessary. The ball assembly acts as the nut while the threaded shaft is the screw.
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a galley
a pole used for pole vaulting
ball-firing
ボールをける
ボールをつく.
a ball
a ball
the magic mallet―(に相当するは)―the magician's wand―Aladdin's lamp
へぼ射手