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making spring weaker

peddlerpeddler Member Posts: 881 ✭✭✭✭
edited July 2015 in Ask the Experts
Need info on how to make a flat spring weaker. Do I make the sand the flats or do I grind the sides very carful? Thanks

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    yoshmysteryoshmyster Member Posts: 21,295 ✭✭✭✭
    edited November -1
    Heat will do it. Not from a hair blower but a $19.99 butane torch.

    What's the project?
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    charliemeyer007charliemeyer007 Member Posts: 6,579 ✭✭✭
    edited November -1
    Grinding is faster but you need to be careful not to draw the temper. Width is less critical that the thickness. Make a jig so you can measure the spring force. Clamp the root to something ridged, measure from a fixed point to the free end. Hang a weight on the free end, re-measure the distance from the reference fixed point. Reduced the hanging by like 25%, thin spring uniformly in thickness as best you can using sand paper or file, mark the surface with a Sharpie first. Repeat mark an file, several times then test to see if it deflects to the proper reference distance with the lighter weight. Then test it in the gun for function. You could do 10% steps. The key is to go slow and check often.

    Having a new spare or 2 on hand before thinning is good. Much easier to take more off than to put it back.
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    iceracerxiceracerx Member Posts: 8,860 ✭✭✭
    edited November -1
    A stone or diamond lap will not cause any heat and will allow more control to gain the thickness you want.

    http://eze-lap.com/products/diamond-hone-stone/
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    Bill DeShivsBill DeShivs Member Posts: 1,264 ✭✭✭
    edited November -1
    File or grind the sides until it's the tension you want.
    Leave the torch alone! Heat will certainly do it, but applying heat indiscriminately will ruin the spring. Why do people post such "helpful" remarks?
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    yoshmysteryoshmyster Member Posts: 21,295 ✭✭✭✭
    edited November -1
    quote:Originally posted by Bill DeShivs
    Heat will certainly do it, but applying heat indiscriminately will ruin the spring. Why do people post such "helpful" remarks?


    Not like there was much to go on other than "making spring weaker". Besides dude had figured a way.
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    peddlerpeddler Member Posts: 881 ✭✭✭✭
    edited November -1
    I know better than to put heat on a spring, I will file or grind sides a little. This spring goes in a old Smith Wesson top break revolver, someone put some other SW spring in it, it is some length but way too strong.
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    pip5255pip5255 Member Posts: 1,631 ✭✭✭
    edited November -1
    why not try to get the correct spring before tying to make one work ?
    we have want ads section here that works fairl well for stuff.
    just because you could doesn't mean you should
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    beantownshootahbeantownshootah Member Posts: 12,776 ✭✭✭
    edited November -1
    quote:Originally posted by Bill DeShivs
    File or grind the sides until it's the tension you want.
    Leave the torch alone! Heat will certainly do it, but applying heat indiscriminately will ruin the spring. Why do people post such "helpful" remarks?


    This.
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    v35v35 Member Posts: 12,710 ✭✭✭
    edited November -1
    File sides to taper, testing as you go.
    Do not use heat unless you want to soften, reshape and reharden & retemper the spring.
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    TxsTxs Member Posts: 18,801
    edited November -1
    quote:Originally posted by beantownshootah
    quote:Originally posted by Bill DeShivs
    File or grind the sides until it's the tension you want.
    Leave the torch alone! Heat will certainly do it, but applying heat indiscriminately will ruin the spring. Why do people post such "helpful" remarks?


    This.

    ...is how a trained 'smith would do it. [^]
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