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HHIP 3901-5032 ER-32 Collet Chuck

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  • HHIP 3901-5032 ER-32 Collet Chuck

    Anyone know if the body of this collet chuck on Amazon.com ishardened?I would want to add tommy bar holes.
    https://www.amazon.com/HHIP-3901-503.../dp/B01ADK2PM2



    Chuck

  • #2
    A pin spanner wrench works a lot better than a tommy bar. With the pin spanner it won't matter if it's hardened. There are 2 kinds of pin spanner. One goes on the face, with a pin on either side of the U shape, one goes around the circumference with one pin near the end. The latter one would be the way to go in this case. If you can't find one the size you want, or it's too expensive, it's easy enough to make your own. The holes for a tommy bar work for the pin spanner as well.
    Kansas City area

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    • #3
      Not sure about that particular brand but the two I bought (different sources for each) weren't particularly hard. I drilled & reamed each one on the edge with HSS tooling for a tommy bar with no problem at all.
      Milton

      "Accuracy is the sum total of your compensating mistakes."

      "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

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      • #4
        Originally posted by DICKEYBIRD View Post
        Not sure about that particular brand but the two I bought (different sources for each) weren't particularly hard. I drilled & reamed each one on the edge with HSS tooling for a tommy bar with no problem at all.
        Ditto , I have three "like" the one pictured. A propane torch could perform local softening enough to allow drilling if it were hard.
        But for $70, It's NOT HARD! ;-)

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        • #5
          Toolguy, the tommy bar is used to hold the chuck stationary while the collet nut is tightened or loosened. my lathe, as all 7x lathes, has no spindle brake.

          Thanks for all the responses.

          Chuck

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          • #6
            chucketn-

            The tommy bar wallows out the holes after a while. The pin spanner does not. On that chuck you would use a pin spanner on the OD of the body and a hook spanner on the collet nut.
            Kansas City area

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            • #7
              I've been using a tommy bar exclusively on mine for several years & have only seen minor wear of the holes. They fit pretty close when I set them up & still fit well after hundreds of tightenings. They're not hardened but aren't too soft either. YMMV
              Milton

              "Accuracy is the sum total of your compensating mistakes."

              "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

              Comment


              • #8
                Originally posted by DICKEYBIRD View Post
                I've been using a tommy bar exclusively on mine for several years & have only seen minor wear of the holes. They fit pretty close when I set them up & still fit well after hundreds of tightenings. They're not hardened but aren't too soft either. YMMV
                would it help to have the bar much softer then the chuck material?
                Ed
                Agua Dulce, So.California
                1950 F1 street rod
                1949 F1 stock V8 flathead
                1948 F6 350 chevy/rest stock, no dump bed
                1953 chevy 3100 AD for 85 S10 frame have a 4BT cummins motor, NV4500
                1968 Baha Bug with 2.2 ecotec motor, king coil-overs,P/S

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