Ahelical compression spring is to be made of oil-tempered wire, d, of diameter 1–mm with a spring index of c = 10. the spring is to operate inside a hole, so buckling is not a problem and the ends can be left plain. the free length of the spring, lo, should be 86 mm. a force of 50 n should deflect the spring 15 mm.

Question

Determine the minimum hole diameter for the spring to operate in

11 mm

Explanation:

Mean spring coil diameter is given from the following relationship

D=cd where C is spring index and d is the diameter of oil-tempered wire

By substitution

D=10*1 mm=10 mm

To find the outer diameter, we add the d to D hence getting the minimum hole diameter as

answer:

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