robert.a.brewer. Posted June 2, 2018 Share Posted June 2, 2018 Which recoil spring shipped with my gun?Is the longer spare an 11 lb spring or is it the shorter one? I need a way to measure springs. I have a small digital scale. What else do I need, and how do I build it? Link to comment Share on other sites More sharing options...
wespac78 Posted June 2, 2018 Share Posted June 2, 2018 Aren't they color coded? Like green is 13# orange is 16#Sent from my SM-G960U using Tapatalk Link to comment Share on other sites More sharing options...
huskerlrrp Posted June 2, 2018 Share Posted June 2, 2018 I just measure the wire diameter and number of coils when I'm confused. If you have a measurement, I can compare to my stock. Factory is typically 16lb. I haven't checked the math but this place has an online calculator. Interesting enough, they don't correlate with the Cajun and CZ Custom values. https://www.thespringstore.com/spring-calculator.html For example a Cajun 11lb (yellow) comes out to be @3.1lb/in spring rate and 9.6lbF, and a gray (14lb) is 4.3lb/in and 11.7lbF. Link to comment Share on other sites More sharing options...
yigal Posted June 2, 2018 Share Posted June 2, 2018 1 hour ago, huskerlrrp said: I just measure the wire diameter and number of coils when I'm confused. If you have a measurement, I can compare to my stock. Factory is typically 16lb. I haven't checked the math but this place has an online calculator. Interesting enough, they don't correlate with the Cajun and CZ Custom values. https://www.thespringstore.com/spring-calculator.html For example a Cajun 11lb (yellow) comes out to be @3.1lb/in spring rate and 9.6lbF, and a gray (14lb) is 4.3lb/in and 11.7lbF. thank u for this. i measured my tso springs in mine jig and find that "13 lb" cz spring actually ~11 lb and the other "11lb" is actually 9.5 lb the calculation of this springs perfect. it was that "13lb" cz spring is 10.6lb and the other "11lb" is 8.9lb the all aftermarket springs from eemann that i purchased:: 14lb is actually 14 . and 13 lb is 13lb. Link to comment Share on other sites More sharing options...
robert.a.brewer. Posted June 2, 2018 Author Share Posted June 2, 2018 thank u for this.[emoji106] i measured my tso springs in mine jig and find that "13 lb" cz spring actually ~11 lb and the other "11lb" is actually 9.5 lb the calculation of this springs perfect. it was that "13lb" cz spring is 10.6lb and the other "11lb" is 8.9lb the all aftermarket springs from eemann that i purchased:: 14lb is actually 14 . and 13 lb is 13lb.So, I do not need to build a spring jig.I need to do the calculation instead. How do you measure the wire diameter?Another reason to get a good caliper? Link to comment Share on other sites More sharing options...
yigal Posted June 3, 2018 Share Posted June 3, 2018 good digital caliper . Link to comment Share on other sites More sharing options...
PRanta Posted June 3, 2018 Share Posted June 3, 2018 In the calculations you need to know how much spring is compressed. The slide cycle will not fully compress the recoil spring. You can multiply the spring rate by compression length to get calculated lb value. This is usually quite close to the measured lb value. Be careful in the spring diameter measurements. A small error will make a big difference in the spring rate. Link to comment Share on other sites More sharing options...
robert.a.brewer. Posted June 3, 2018 Author Share Posted June 3, 2018 In the calculations you need to know how much spring is compressed. The slide cycle will not fully compress the recoil spring. You can multiply the spring rate by compression length to get calculated lb value. This is usually quite close to the measured lb value. Be careful in the spring diameter measurements. A small error will make a big difference in the spring rate.Thanks, but I don't get it just yet.What is the formula for spring rate?I assume the rate will be in pounds per inch, and then multiply by inches of compression. Link to comment Share on other sites More sharing options...
yigal Posted June 3, 2018 Share Posted June 3, 2018 i can measure the real spring force on my assembled gun. and it is very close to the formula. Link to comment Share on other sites More sharing options...
PRanta Posted June 3, 2018 Share Posted June 3, 2018 34 minutes ago, robert.a.brewer. said: What is the formula for spring rate? I assume the rate will be in pounds per inch, and then multiply by inches of compression. The link for spring calculation page was supplied few posts ago. It will give you the spring rate. You got the rest right. Link to comment Share on other sites More sharing options...
robert.a.brewer. Posted June 4, 2018 Author Share Posted June 4, 2018 i can measure the real spring force on my assembled gun. and it is very close to the formula.How do you measure the spring on the gun?Do you push the slide into a scale with something? Link to comment Share on other sites More sharing options...
yigal Posted June 4, 2018 Share Posted June 4, 2018 2 hours ago, robert.a.brewer. said: How do you measure the spring on the gun? Do you push the slide into a scale with something? yes. Link to comment Share on other sites More sharing options...
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