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  • Don52
    started a topic Custom Wrench

    Custom Wrench

    At work one of the machines that we are in the process of designing had a bolt that was inaccessible with a torque wrench using standard tools. We needed a custom tool to access the bolt so that we could properly torque it down. Using an oxyacetylene torch I bent the handle of the ratcheting combination wrench to make the open end side of the wrench parallel to the ratcheting box end. Next I welded an impact socket on the open end side to allow for access with a 3/8” extension and a torque wrench. I made a 14 mm to 10 mm hex adapter to allow us to use a 14 mm wrench with the 10 mm hex required to tighten the inaccessible M12 bolts, because we were concerned that the M10 ratcheting combination wrench would be too wimpy.

    One thing I noticed was that the thinner socket needed more heat than the thicker open end wrench to make them both the same color during welding. I am assuming that this might be because the socket had more carbon than the open end wrench and a higher melting temperature.
    Attached Files

  • Don52
    replied
    Attached is a picture of the wrench in operation.
    Attached Files

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  • justweldthis
    replied
    Sweet and neat

    Nice welding

    Just jim

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  • Don52
    replied
    The engineer on the wrench project wanted to use a wrench that had a part number and was readily available from McMaster Carr because we can get it delivered overnight for standard shipping. Unfortunately the Armstrong version of the ratcheting box wrench that McMaster Carr stocked didn’t have a stop on it so the hex would pass right through it. To solve the problem I drilled a 3/32” hole thru the hex using a solid carbide drill because the hex is hardened. I was surprised when I pressed a 3/32” spring pin into the hole because the hardened hex key shaved the OD spring pin as you can see. For the second longer hex I drilled a 1/8” hole and glued in a 3mm dowel using Loctite 680. This resulted in a neater job.
    Attached Files

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  • Don52
    replied
    Originally posted by slow50 View Post
    what did you do to heat treat it after bending and welding it? i ask becuase i fix specialty tools at work sometimes when they break and from what ive learned if you dont treat it some how its just gona break again. so far what works best for me it get it red hot then quinch in heat treat oil.
    In this case the hot bend in the wrench was so far away from the bolt that the stress was very much diminished by the moment arm of the extension so I just let the wrench cool off in the air.

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  • mediaad
    replied
    Thanks!!!!!!!!!!!!!!!!!!!!!!!!!

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  • Don52
    replied
    Originally posted by R W View Post
    This formula differs from the BELKNAP calculator.
    The Divisor A ( first calculation) and Dividend A (second calculation) should replaced by the L (length of wrench) in both cases.
    The Belknap calculation is correct.
    The one in my previous post is wrong.
    Attached is my derivation.
    Sorry for the confusion
    Attached Files
    Last edited by Don52; 09-09-2012, 08:57 PM.

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  • slow50
    replied
    nice job. what did you do to heat treat it after bending and welding it? i ask becuase i fix specialty tools at work sometimes when they break and from what ive learned if you dont treat it some how its just gona break again. so far what works best for me it get it red hot then quinch in heat treat oil. those calculation charts are cool good to know. do you guys not have a torque checker? we have one at work and its amazing how much different extenstions and what not change the torque.

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  • R W
    replied
    Originally posted by Don52 View Post
    Attached is a picture with the calculaton for the diminished torque when used with an extension. (Courtesy of Dale M.)
    This formula differs from the BELKNAP calculator.
    The Divisor A ( first calculation) and Dividend A (second calculation) should replaced by the L (length of wrench) in both cases.

    Leave a comment:


  • weld on
    replied
    on-line calc

    I like this one

    http://www.belknaptools.com/support-...ns-calculator/

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  • GilaSlim
    replied
    Originally posted by Goodhand View Post
    Don52,

    If the first formula is used, it appears that the output torque is actually increased when using an extension, even though the input torque remains the same. So, it follows... if the input torque at the handle is 150#, and the extension is equal to the length of the wrench (in effect doubling the length), then the output torque is 300#.
    Regards,
    Goodhand
    And that's the whole point of the exercise. One formula says if your wrench is set for 150, you get 300 with the extension. The other formula says if you want 300, then set your wrench to 150. The formulas allow you to substitute different values for your extension length, wrench length, and the desired torque to be applied (which is usually known).

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  • Goodhand
    replied
    Originally posted by Don52 View Post
    Attached is a picture with the calculaton for the diminished torque when used with an extension. (Courtesy of Dale M.)
    Don52,

    If the first formula is used, it appears that the output torque is actually increased when using an extension, even though the input torque remains the same. So, it follows... if the input torque at the handle is 150#, and the extension is equal to the length of the wrench (in effect doubling the length), then the output torque is 300#.
    Regards,
    Goodhand

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  • R W
    replied
    Thanks for the info re torque wrench extension.

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  • strube1369
    replied
    Been a few times, years ago, when I sure coulda used that kinda thinking. The welding hobby is pretty recent for me. Nice one, man. Nice one.

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  • Don52
    replied
    Originally posted by JSFAB View Post
    Foot-pounds is simply how many pounds of force you apply one foot away. If one is even moderately competent with the math, easy to scale it up or down. Most of the old-time Cat mechanics or JD mechanics, that I knew anyway, didn't even own a torque wrench. Torqued every bolt, even the head bolts, up by feel.
    Attached is a picture with the calculaton for the diminished torque when used with an extension. (Courtesy of Dale M.)

    The attached calculation is wrong.
    The correct one is on post #13
    Attached Files
    Last edited by Don52; 09-09-2012, 08:58 PM.

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