Does anyone have a good spreadsheet and or links to good (free) websites
that calculate parameters for compression and extension springs?
I've found one or 2 links that are OK up to a point, but none are ideal.

My immediate need is to be able to calculate the maximum safe working length of an extension spring of known dimensions. The material is galvanised music wire, but I don't know what its safe working stress is considered to be, nor do I know how to calculate the stress for a given extension of this particular spring.

Any help would be appreciated.

Regards, John H

My immediate need is to be able to calculate the maximum safe working length of an extension spring of known dimensions. The material is galvanised music wire, but I don't know what its safe working stress is considered to be, nor do I know how to calculate the stress for a given extension of this particular spring.

Any help would be appreciated.

Regards, John H