Mechanical Engineering - Machine Design - Discussion
Discussion Forum : Machine Design - Section 1 (Q.No. 8)
8.
A screw is said to be over hauling screw, if its efficiency is
Discussion:
13 comments Page 2 of 2.
Amde tesema said:
6 years ago
A screw is said to be self hauling if efficiency is >50%.
KAUSHAL kumar said:
5 years ago
Interlocking :Torque =+ve.
(Friction angle >helix angle),
efficiency<50%.
Overhauling: Torque=-ve.
(friction angle <helix angle).
Efficiency>50%.
(Friction angle >helix angle),
efficiency<50%.
Overhauling: Torque=-ve.
(friction angle <helix angle).
Efficiency>50%.
(1)
Vijaykumar A.L said:
5 years ago
I was thinking the same, there is no relation between overhauling and efficiency. Overhauling means screw will automatically lower the load. Technically negative torque required to lower the load ie. Friction angle < lead angle. But it can be also proved by using maths efficiency >50% for overhauling.
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