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Old 01-07-2018, 03:23 PM   #1
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Spring Tester

One of my weekend projects (in between watching football games) was to build a spring tester. I found a kit online for around $40 but figured I could build something that would work since I already had a scale I could use. I have a 0-50 lb fish scale that doesn't get much use given the size of fish I've been catching lately

Went to the hardware store and found the items that I thought would work and came home to assemble (see pics). Once completed, I tested a new recoil spring for my Colt Mustang that I had just bought. It was an 11 lb spring (factory spec) and it tested at exactly 11 lbs. Spooled up a used flatwire spring from my Micro 380 and it tested at 9 lbs. I'm pretty happy with it and the total cost (less the scale I already had) was right at $9

Mainly wanted to check the recoil spring on my Rock Island Baby Rock and will post another thread on that shortly.
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Old 01-07-2018, 03:36 PM   #2
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Nice job Tenjun, I have a Secure Firearm recoil spring tester with a digital scale that works very similar to the one you built.
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Old 01-07-2018, 03:45 PM   #3
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Nice work!
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Old 01-07-2018, 06:58 PM   #4
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How about the parts list? Thanks
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Old 01-07-2018, 07:56 PM   #5
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Originally Posted by Jerry1834 View Post
Tejun

How about the parts list? Thanks
Here is a list of the parts I got specifically to test the Baby Rock recoil spring. You can modify based on what spring(s) you will be testing and their particular diameters (id/od).

(1) x 12 pvc irrigation nipple
(1) pvc threaded cap
(1) #6 32 threaded rod 12 long
(1) Brass tube 3/16 id x .18 od (cut to length that allows about of threaded rod to protrude on each side ~11.5)
#6 nuts & washers

For the eye end to hook the scale, I used a dog leash swivel snap and just cut the eye end off and put on one end of the threaded rod with 2 nuts to hold in place. Put the tube over the threaded rod. Drill a hole in the 1/2" pvc cap that allows the brass tube to move freely through it. Slide the spring you want to test on the open end of the rod/tube assembly then install a washer/nut. Insert the spring side of the assembly into the 1/2" Pvc nipple and screw the pvc cap onto the nipple. Pull the tube assemble to compress the spring and make mark on the tube so you know the point to hold and take reading on the scale. Hook the scale into the eye. Holding the scale in one hand and the pvc nipple in the other pull on the scale to compress the spring to the mark made on the tube. Note the reading on the scale.

Thats about it. You can make other assemblies for larger diameter springs if you have multiple sizes. I used a 0-50 lb scale I purchased at Academy (for $20) but there are many out there at lower costs. You want one that does not have an auto peak hold on the weight.

Let me know if you have questions on any of the above. Good luck !!
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Old 01-08-2018, 04:23 AM   #6
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Nice job Tejun.
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Old 01-17-2018, 02:10 PM   #7
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Thanks! going to build one myself....
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