Coil Spring Expansion
Coil Spring Expansion
(OP)
Does anyone have know of any formulae/info to calculate the diametrical expansion of coil compresion springs?
Have looked in all the usual places with no luck!
Have looked in all the usual places with no luck!





RE: Coil Spring Expansion
I have a formula here for coil growth its:-
O.D.solid= sqr root (D^2+ d + (p^2-d^2/(3.142^2)))
regards desertfox
RE: Coil Spring Expansion
I just need a clarification on the symbols.
Also is the last bit meant to read (p^2-d^2)/(pi^2)?
Cheers,
Richg1
RE: Coil Spring Expansion
yes you are correct with your assumption.
D= o.d of spring
d= wire dia
regards desertfox
RE: Coil Spring Expansion
how do you account for different wire properties and hence expansion?
Phil.
RE: Coil Spring Expansion
The p is the pitch of the coils
regards desertfox
RE: Coil Spring Expansion
Thanks for the formula.
I'm working on a problem with a coil spring binding in the ID of its housing. The above formula is very helpful but do you have anything that would take material properties into account?
Cheers,
Ubergeek
RE: Coil Spring Expansion
RE: Coil Spring Expansion
Where:
O.D. - Outside diameter
D - Mean diameter
d - wire diameter
P - coil pitch
DESIGN HANDBOOK Engineering Guide To Spring Design, 1987 Edition, Page 31, Associated Spring - Barnes Group Inc.