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Maximum possible efficiency of a self-locking screw is

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+1 vote
in Machine Design by (86.7k points)
Maximum possible efficiency of a self-locking screw is

(a) 50%

(b) 75%

(c) 66%

(d) 33%

This question stumped me while doing exercises.

I would like to ask this question from the Efficiency of Screws in lesson Power Screws of Machine Design

1 Answer

0 votes
ago by (48.2k points)
The accurate option is (a) 50%

Explanation: For self locking screw Ǿ(friction angle)>ἀ (helix angle), hence efficiency < tanǾ/tan(Ǿ+ἀ) or efficiency < tanǾ(1-tan²Ǿ)/2tanǾ.

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