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Danke, Saint: I'm not saying you guys are wrong, but could you state where you get your information from or how you know? I'm trying to work out the forces the spring undergoes in my head and I believe there to be mainly two - bending and axial.
How I see things happening:
-The coils act like mini 'levers' of sorts causing bending moments on these 'levers' - main cause of the spring length change.
-Stretch out the spring into a straight wire and picture an axial force on wire. This will cause it to shrink. Now when this wire is wound into a spring the shrinkage would cause the spring to rotate during compression/decompression. I can't see this axial force/strain being great enough to really have a noticable effect.
A simple definitive test would be to chrono a gun with a bearing spring guide. Replace the spring guide with a non-bearing one but add spacers so the overall thickness is the same and compare the chorno results. Anyone ever done this?
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