Technical opinion needed: How many active coils?


Kipper

Kipper

Well-Known Member
Joined
May 27, 2008
Messages
2,163
So I'm messing about with some spring rate calculations and I can't seem to find a definitive answer anywhere, well when I think I have another source is telling me something different.

I have this linear coil spring with closed and squared ends and I need to know how many active coils the spring has, I keep changing my mind between 5,6 & 7.



Help is appreciated :nice:.
 
I would say 5 personally, but don't take that as gospel.
 
There is just under 5.

PS.. I design springs, amongst other things.
 
Thanks guys, was swaying towards 5 myself, although it was bringing my answer to my calculation higher than I would have imagined. Around the 12 kg/mm region, 1mm of deflection per 12kg load placed on the spring.

It definitely seems that as the number of active coils gets lower the spring rate increases rather quickly assuming all other spring dimensions remain constant.

Maybe cut springs aren't as stupid as people make out :p.

Although progressive springs are a different kettle of fish.
 
Just under 5,
From the picture there appears to be just under 7 total coils,
Top and bottom are inactive as they are touching The ends/sitting in the cup/platform so don't compress,

That's how I've always assumed it worked...
 
Last edited:
I'd also say 5 as said top and bottom will be inactive due to being seated
 
You must log in or register to reply here.
Back
Top