Keith Glasscock
Gold $$ Contributor
I use my 21st century hydro-press. A quick calibration test, and viola! you have a spring tester.
Bolt/ Firing pin maintenance & care
- Thread starter Mulligan
- Start date
Jayplace
Gold $$ Contributor
I've used a spring tester for automotive valve springs and assume it's like that. It's like an arbor press also. Is your spring tester based on a set amout of travel or based on a certain compression height? I haven't seen one used?
Alex Wheeler
Site $$ Sponsor
I check them at the cocked and fired lengths. Its not just about weight, how much they bleed off matters too (rate)
Is the spring poundage measured at installed length, cocked or fired length?
The following analogy is from my drag racing years so bear with me. The spring rate defines the characteristics of the spring as purchased. It is determined by the material, the diameter of the materiel and the number of turns per inch. It is calculated by the change of the measured force divided by the amount of change in the compression length equal rate. With that number you can calculate what the pressure will be at a given installed length. It will let you determine if and how much you need to cut fron a spring to get it to do what you want. Typically all else equal a spring with more turns will have a lower rate than one with more turns because each coil will compress less when compressed the same amount. BTW when I measure the rate of a spring I get my numbers close to the installed height that I intend to use.
Now my question is what do the #21, #25 lb that everybody uses refer to?
The following analogy is from my drag racing years so bear with me. The spring rate defines the characteristics of the spring as purchased. It is determined by the material, the diameter of the materiel and the number of turns per inch. It is calculated by the change of the measured force divided by the amount of change in the compression length equal rate. With that number you can calculate what the pressure will be at a given installed length. It will let you determine if and how much you need to cut fron a spring to get it to do what you want. Typically all else equal a spring with more turns will have a lower rate than one with more turns because each coil will compress less when compressed the same amount. BTW when I measure the rate of a spring I get my numbers close to the installed height that I intend to use.
Now my question is what do the #21, #25 lb that everybody uses refer to?
Those of you pushing a spring down on a scale to get the weight, have a measurement ? I was thinking in terms of 1/4 inch push or something in that line of thinking?
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