Question

*PLEASE DO PARTS E-H AND I IF YOU COULD!*

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.

a) What is the spring index, C?

b) What is the total number of coils, Nt?

c) What is solid length, Ls?

d) What is the maximum suggested load?

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?

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?

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...

A helical compression spring is made from music wire that is
1.04 mm in diameter and has an outer coil diameter of 13.74 mm with
a free length of 50.8 mm and 10 total coils with plain ends.
What is the solid length Ls?
What is the spring rate k in N/m ?
If the spring rate is 1000 N/m what is the maximum shear stress,
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A helical spring is to provide a minimum force of 600 N at
installation and have a working deflection of 25 mm. The spring
rate is 13 N/mm. The coil must fit in a 55 mm diameter hole with at
least 2.5 mm clearance. Use a 6.5 mm diameter unpeened music wire
with squared and ground ends. Using 15% clash allowance, find:-
i. spring constant
ii. free length of the spring.
iii. the ‘solid’ length of the spring
iv. Draw...

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