Question
Download Solution PDFMultistart threads are used to get
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- 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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