| Original Message |
warren (Login lettercarrier)
Posted Jul 10, 2009 3:36 PM
I found this formula for a spring
The spring rate is calculated as follows:
(WD^4 x 11500000) / (8 x NC x (OD-WD)^3)
OD=outside diameter
WD=wire diameter
NC=number of coils
now: "The power that the gun imparts to the pellet is largely dependent on the capacity of the spring to hold energy."
Energy is another word for work, and it's simply "force x distance".
on a M34 the spring is 11.5" long and if set in comes down to 11"
at 11" it has its force and distance already incorporated; with the piston, top hat and rear guide you add from 1 1/2" to 2" to the spring and that is called Pre-Load
Pre-load is what kills the spring if not done proper
all springs; being them OEM or from outside sources ie; JM are done to the proper Spring Rate for the specific Model
It is the improper pre-load that damages the spring and not the pellet weight
warren
and remember "it's 30% the gun and 70% the shooter" |
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