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  • Thumb repair

    Customer sent me this pic. Heading out today to fix it. How do you not notice this until it's this bent?

    Click image for larger version

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  • #2
    Careless operator? Looks like the sacrificial plate & stitch welds did their job & saved the stick though.
    Last edited by Old Skool; 01-23-2015, 03:34 PM.
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    • #3
      Thumb repair

      Any photos of the repair yet?

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      • #4
        Here ya go. It was more difficult than I thought to get it straight & flat. Got it back & fully welded it as I always do. I know it is usually recommended it be stitched but I have repaired a bunch of thumbs that have been torn off.

        I had to slice the rib to get it to bend back & also slice the plate itself to align it as it stretched on one side more than the other. The red primed tube is my port-a-power pushing it down using the bucket to push against.

        Click image for larger version

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        MM250
        Trailblazer 250g
        22a feeder
        Lincoln ac/dc 225
        Victor O/A
        MM200 black face
        Whitney 30 ton hydraulic punch
        Lown 1/8x 36" power roller
        Arco roto-phase model M
        Vectrax 7x12 band saw
        Miller spectrum 875
        30a spoolgun w/wc-24
        Syncrowave 250
        RCCS-14

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        • #5
          Here is the same machine about a week earlier. They tore a boss off the one side of the thumb. At that time I didn't see any cracks on the plate to stick welds. This customer is hard on machines.

          Click image for larger version

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ID:	516962
          MM250
          Trailblazer 250g
          22a feeder
          Lincoln ac/dc 225
          Victor O/A
          MM200 black face
          Whitney 30 ton hydraulic punch
          Lown 1/8x 36" power roller
          Arco roto-phase model M
          Vectrax 7x12 band saw
          Miller spectrum 875
          30a spoolgun w/wc-24
          Syncrowave 250
          RCCS-14

          Comment


          • #6
            MMW:

            Most of the thumbs I work on are hydraulic thumbs, and we normally add bypasses set very low between the cylinder and the valve, as the bucket curls, it will push the thumb back without doing any structural damage.

            All the thumb is supposed to do in this case, is simply keep the long stuff from falling off.

            I see a fixed thumb in the pictures you posted. The damage is 100% operator error, unless he was saving somebody's life, he should be fired.
            Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

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