Question

2. Use hard-drawn 0.075” diameter wire to make a spring with
closed ends, a spring index of 10,

and 12 total coils. Use a load factor of safety of 1.05 and make
the free length 3.0 inches.

a) What is the spring rate?

b) What is the critical length for absolute stability?

c) What is the maximum suggested load?

d) What is the force to close to solid, Fs?

e) What is the critical frequency?

f) What is the factor of safety, solid, ns?

Answer #1

1. Evaluate a music wire spring with plain ends where
the wire diameter is 0.100” and the outer
diameter is 0.600”. The desired spring rate is 100 lbf/in and the
free length is 2.4”. Let the load
safety factor be 1.00.
e) What is the maximum suggested deflection?
f) What is the force to close to solid, Fs?
g) What is the critical length?
h) What is the critical frequency?
i) What is the factor of safety, solid, ns?

A helical compression spring is made of hard‐drawn steel wire
0.080‐in in diameter, has an outside diameter of 0.880 in, and a
pitch of 0.040 in. The ends are plain and ground, and there are 8
total coils. If the spring is supported by two parallel plates, is
it possible that the spring can buckle in service? Support your
response quantitatively.

A compression spring has the following
conditions:
Axial load = 1.0 lb; Spring OD = 0.5”; 0.06” wire diameter;
Squared and ground ends; 20 total turns; Material is oil-tempered
steel wire Spring’s free length = 3.0”
Answer the following:
What is the safety factor with respect to stress? (N=can
do/doing=allowable stress/induced stress)
Will the spring bottom out (i.e., reach solid length with
applied load)? Yes or no?
What is the safety factor with respect to buckling? (N=can
do/doing=allowable ?/induced ?)

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