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  • Backhoe thumb

    i was wondering if anyone has plans for a mechanical thumb for a backhoe??
    Miller Bobcat 250
    Victor O/A
    Chop Saw
    Porta-band
    grinders
    hand tools

  • #2
    I don't have plans but have worked with a number of machines with them. Are you thinking of a fixed thumb or a hydraulicly actuated thumb?

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    • #3
      My father in law has been lusting for one for a while now.
      Who do you call when the lawmakers ignore the law?

      Miller AC/DC Thunderbolt 225
      Miller 180 w/Autoset
      Old cutting torch on LPG

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      • #4
        I was thinking more on the lines of a fixed thumb for a 580D Case
        Miller Bobcat 250
        Victor O/A
        Chop Saw
        Porta-band
        grinders
        hand tools

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        • #5
          Personally I would not use a telescoping brace. Remember that all your bucket thrust will be trying to collapse the brace. You will need a good sized pin to prevent this. On large machines they often have multiple holes for adjustment.



          This one attaches to the boom on both points. I would be careful about bending the boom with one of these.
          Click image for larger version

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          Here's a drawing with some dimensions I found for this style.
          http://cdp-backhoe.com/backhoe_thumbs.htm

          This drawing uses a single mounting plate base that will stiffen the boom if you mount the entire unit to the boom.
          Click image for larger version

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          Most I have worked with use the bucket pin as the pivot, like that shown in the pict by Iron head. You can get the correct size bushings ( replacement bucket bushings) and a longer pin from Case to do this. Use a good heavy plate for the jaw 3/4"+ and cut some serrations on it to grab material. A hook or lip at the bottom works well if you plan on using it to pluck curb or sidewalk.

          Here's a couple more things that might help. These are on a Case so they may work best for your application.
          Click image for larger version

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          Hope these help.

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          • #6
            Thanks's everyone you have been a great help as usual
            Miller Bobcat 250
            Victor O/A
            Chop Saw
            Porta-band
            grinders
            hand tools

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            • #7
              CAD drawing

              Go to http://www.excavatorthumb.com/

              then click the link the model size you need and you can see some good pictures and info. There is some good info at that site.

              Nick

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