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Thread: Removing a broke off thread

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    Supporting Member Frank S's Avatar
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    Removing a broke off thread

    A mechanic friend of mine dropped off a part that had the Dutchman thread of a horizontal boring bit broke off deep in the part
    Asked me if I could get it out for him because he knew how tight those things get.
    So I torched a couple holes in one end of my work table bolted and clamped the part down then proceeded to weld down inside until I had the weld built up high enough to weld a 1" nut to it. Once it had cooled I put a 1 /12" box end wrench on the nut and whacked the side of the wrench a couple times with a 10 lb sledge hammer, the Dutchman screwed right out.
    Removing a broke off thread-img_20211113_121126hg.jpg
    Removing a broke off thread-img_20211113_122224jk.jpg

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    mwmkravchenko (Nov 20, 2021)

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    Supporting Member WmRMeyers's Avatar
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    Nice combination of Blue Wrench and Percussive Maintenance!

    Bill

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    mwmkravchenko (Nov 20, 2021)

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    Supporting Member Frank S's Avatar
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    Quote Originally Posted by WmRMeyers View Post
    Nice combination of Blue Wrench and Percussive Maintenance!

    Bill
    Yes, in this case the blue wrench was in the form of duel shield flux cored wire. When something is broken off as deep as that one was, on top of being a tapered thread hydraulically torqued, welding them out is usually the fastest option. Not only does the welding allow you to build up to surface so you can attach a means of twisting it, but the heat from the welding causes expansion and the gradual cooling contraction. You never want to quench or rapid cool because it will make things brittle . The filler wire I use has nearly 90,000 lb tensile strength, but for times when that is not enough I have some stick electrodes that have a 250,000 PSI yield
    Last edited by Frank S; Nov 14, 2021 at 08:56 PM.
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  6. The Following User Says Thank You to Frank S For This Useful Post:

    mwmkravchenko (Nov 20, 2021)

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    Thanks Frank S! We've added your Broken Thread Removal Method to our Metalworking category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:




  8. #5
    Supporting Member mwmkravchenko's Avatar
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    Nice one Frank. Must have been glowing red hot by the time you were up high enough to weld on the nut!



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