Question 1. Spiral spring was used to design a mechanical clock. The spring is made of a flat strip 6 mm wide and 0.25 mm thick. The length of the strip is 2.5 m. Assuming the maximum stress of 800 MPa to occur at the point of greatest bending moment. Take E = 200 kN/mm2. (a) Calculate the bending moment. (b) The number of turns to wind up the spring. (c) The strain energy stored in the spring.
Question 1.
Spiral spring was used to design a
(a) Calculate the bending moment.
(b) The number of turns to wind up the spring.
(c) The strain energy stored in the spring.
Question 2
A helical compression spring is wound using 2.5 mm diameter music wire. The spring has an outside diameter of 31 mm with plain ground ends, and 14 total coils.
a) Estimate the spring rate.
b) What force is needed to compress this spring to closure?
c) What should the free length be to ensure that when the spring is compressed solid the torsional stress does not exceed the yield strength?
d) Is there a possibility that the spring might buckle in service?
Question 3
A helical compression spring with square and ground ends has an outside diameter of 14 mm, 20 total coils, a wire diameter of 2 mm, and a free length of 105 mm. Calculate the spring index, the pitch, the solid length, and the shear stress in the wire when the spring is compressed to its solid length.
8
Question 4
An 02-series ball bearing is to be selected to carry a radial load of 8 kN and a thrust load of
4 kN. The desired life LD is to be 5000 h with an inner-ring rotation rate of 900 rev/min. What
is the basic load rating that should be used in selecting a bearing for a reliability goal of 0.90?
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