The Firing Line Forums Spring weight tester???
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 June 11, 2009, 08:04 PM #1 fatboy02 Senior Member   Join Date: November 27, 2005 Location: Olivet, MI Posts: 163 Spring weight tester??? Is there a tester, sort of like a trigger pull test, to see what your spring weights are. so that you know what weight replacement springs to order. I wasn't sure what to call it.
 June 11, 2009, 10:10 PM #2 brewman Member   Join Date: November 19, 2008 Location: South Australia Posts: 54 Solid Height Solid Height = (Number of Coils – 0.25) x Wire Diameter For example, for a spring with 14 coils and a wire diameter of 0.5”, the Solid Height would be calculated as follows: Solid Height = (14 – 0.25) x 0.5 = 6.875 Rate Rate = Load (lbs.) ÷ Spring Deflection (in.) For example, if a spring deflects by 2.75” under a load of 300 lbs, the Rate would be calculated as follows: Rate = 300 ÷ 2.75 = 109 Deflection Deflection = Load (lbs) ÷ Rate For example, a spring under a load of 300 lbs with a 109 Rate, the deflection would be calculated as follows: Deflection = 300 ÷ 109 = 2.75 Load Load = Deflection x Rate For example, a spring with a 109 Rate and a 2.75” deflection, the load would be calculated as follows: Deflection = 2.75 x 109 = 300 Combined Spring Rate This is used when two springs are stacked on top of each other. Combined Spring Rate = (Spring Rate 'A' x Spring rate 'B') ÷ (Spring Rate 'A'+Spring Rate 'B') For example if the rate for spring 'A' is 200 and the rate for spring 'B' is 500, the combined rate is calculated as follows: Combined Spring Rate = (200x500) ÷ (200+500) = 143
 June 12, 2009, 01:37 AM #3 Bill DeShivs Senior Member   Join Date: April 7, 2006 Posts: 9,090 I'll make it easier. It's called a scale. You need different scales for compression and expansion springs. I believe Brownell's sells them. __________________ Bill DeShivs, Master Cutler www.billdeshivs.com
 June 12, 2009, 07:24 PM #4 fatboy02 Senior Member   Join Date: November 27, 2005 Location: Olivet, MI Posts: 163 Scale seemed wayto easy, I have looked at Brownells but could not find it. Now that I know what to call it I will look elswhere too. Thanks That first response from Brewman is great information but made my head spin reading it
 June 12, 2009, 08:37 PM #5 HiBC Senior Member   Join Date: November 13, 2006 Posts: 5,248 How precise are you talking(that is like how much money do you want to spend)? I might spell it wrong,but there is an outfit named Chatillion that makes such gages for QC purposes. However,you might look at scales to weigh fish. extension springs,obviously you pull on,but to compress Suppose you drilled a hole in a board.put a long eyebolt or the equivalent through the hole,thread on the spring,then put a fender washer and nut on it.Hook the fish scale to it and pull.Now,there are many ways you could vary this,but it might get you thinking. Heck,you could put the board horizontal,the spring on top,with a washer on top,something thru the spring and hang a bucket on it.Pour in water till you get whatever compression you want,and weigh the bucket. Don't forget the tare weight of whatever you hang.
 June 13, 2009, 07:01 AM #6 fatboy02 Senior Member   Join Date: November 27, 2005 Location: Olivet, MI Posts: 163 OK, maybe I should have posted the reason I am looking for one. How do you know what pund replacement springs to order for your semi auto guns? I have a customized 1911 I purchased used (the smith that built it is dead can't ask him) I want to know what pound springs to order as replacents because what ever they are they work and I did not want to guess. So how do you guys order springs?
 June 13, 2009, 07:46 AM #7 DWARREN123 Senior Member   Join Date: January 22, 2006 Location: BETWEEN TN & KY Posts: 1,758 Springs are cheap enough to order a set in different pounds to find the one you need/want and works for your gun/loads. Wolff Springs sells sets and individual springs for all sorts of guns and purposes. __________________ Have a nice day!
 June 14, 2009, 01:06 PM #8 Bill DeShivs Senior Member   Join Date: April 7, 2006 Posts: 9,090 If the springs work, why would you replace them? __________________ Bill DeShivs, Master Cutler www.billdeshivs.com
 June 14, 2009, 08:10 PM #9 DWARREN123 Senior Member   Join Date: January 22, 2006 Location: BETWEEN TN & KY Posts: 1,758 Springs do wear out so that is why there are replacements available. __________________ Have a nice day!

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