Multistart threads are used to get

This question was previously asked in
BPSC AE Paper 6 (Mechanical) 25th March 2022 Official Paper
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  1. smaller linear displacement
  2. larger linear displacement with assured self-locking
  3. larger linear displacement with no guarantee of self-locking
  4. None of the above

Answer (Detailed Solution Below)

Option 3 : larger linear displacement with no guarantee of self-locking
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Detailed Solution

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Explanation:

  • Multistart threads may be used to increase the linear displacement of a screw in one revolution.
  • But this increases the angle α and if α > ϕ, the screw may overhaul.
  • For this purpose, a compound screw may be used for increasing the linear displacement per revolution.
  • Total displacement in one revolution = p1 + p2 as the threads are of opposite hands.
  • In differential screws the threads of the same hand with a small difference in the pitch are used so that the total displacement per revolution is equal to the difference of the two pitches.
  • This is used in precision equipments.

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