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Thread: Backhoe thumb

  1. #1
    Join Date
    Jan 2008
    Location
    southern vermont
    Posts
    38

    Default 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. #2
    Join Date
    Feb 2008
    Location
    North of Phila. PA
    Posts
    404

    Default

    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?

  3. #3
    Join Date
    May 2008
    Location
    Belle Plaine Iowa
    Posts
    270

    Default

    My father in law has been lusting for one for a while now.

  4. #4
    Join Date
    Jan 2008
    Location
    southern vermont
    Posts
    38

    Default

    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

  5. #5
    Join Date
    Feb 2008
    Location
    North of Phila. PA
    Posts
    404

    Default

    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.
    thumb.jpg



    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.
    thumb dwg.jpg


    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.
    thumb2.jpg
    thumb3.jpg
    thumb4.jpg

    Hope these help.

  6. #6
    Join Date
    Jan 2008
    Location
    southern vermont
    Posts
    38

    Thumbs up

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

  7. #7
    Join Date
    Nov 2006
    Location
    NW PA
    Posts
    27

    Default 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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