[Ducati] Shock spring info?

[Don Hill]

Yeah ... The problem is balancing something heavy enough to deflect the 
spring enough to give a reliable deflection. We're taking springs in the 450 
lb/in range. I was thinking put spring up on patio roof (on paired rafters), 
hang something of known mass through the middle of the spring (thereby 
compressing it), measure deflection. Or there's the leverage method ... 
build simple (extra large) "can crusher" ... ad mass, multiply by leverage 
ratio, measure deflection ...
I'd like to get ~ 1" of deflection to be reasonably acurate.
Don

Subject: Re: [Ducati] Shock spring info?


> I've never done this for a bike spring, but all you need is a known mass
> that you can compress the spring with and measure how much the spring 
> length
> changes with that mass (well, force - F=m*a where a is the acceleration of
> gravity).  So maybe you could set the spring on the floor, find something
> heavy to set on top of it, and measure the deflection.  You'd ideally want
> something heavy enough to cause enough deflection so that whatever method
> you were using to measure deflection had a low percent error.
>
> John
> http://ldsg.snippets.org/HORNS/ducati.html