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Grizzly Quick Change Collet Set - R8

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  • #16
    Hey Jack: Do you have any more info on the neat looking vertical head for your little atlas horizontal? I have the basic casting but no prints or other info. I do best when I follow someelse's lead.
    Thanks
    [email protected] or PM me if you have info to share.
    John Burchett
    in Byng OK

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    • #17
      Originally posted by jkilroy
      If they are TG's they are probably TG 75's but those usually go for big bucks, $25 ea. and up. Looks like a home grown variant, but should work well.
      TG 75 do not go to 1", TG 100 go to 1"
      Mark Hockett

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      • #18
        I have a similar set. The taper is of course R8, but the collets are not. They are not ER either. Mine, at least, are Ortlieb.

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        • #19
          If that set isn't ER type (and it probably isn't as they'd be dumb not to say so if it was), I'd go with a R8/ER holder and collet set from www.maritool.com instead. Good quality and prices, great support.

          I don't know about "quick change" with these types of collets and holders thou, I use them a lot on my CNC-BP mill but if you are running carbide endmills you have to crank them up to factory torque specs (60 to 80 ft-lbs on ER32) or they'll slip on you. I had to make a special fixture to do this, its too much to try to do in the spindle. I bought a cheapo R8 to int40 adapter and put mounting plates on it so I can pop it in my vise, when using endmills I tighten the collets in that fixture.

          Paul T.

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          • #20
            Grizzly Collet Set

            I bought a set of Grizzly's quick-change collets (#T10068) with the R8 adapter. The finish is excellent, and the runout is zip. I'm impressed with the workmanship.

            Nonethelsss, I'm disappointed in them.

            The adapter tightens the collet using a threaded ring. When the ring is removed, which you must do to change collets, it's difficult to get the threads started again.

            Worse, the collet does not release when the clamping force is removed. It continues to grip the tool. The threaded ring has to be removed and the collet pried out of the holder. Quick change it's not.

            I could bevel the threaded ring so it would start easier, but I see no easy way to get the collet to release when it's clamping pressure is released. This must be a design problem, and I don't see an easy answer.

            I'll probably return the set to Grizzly

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            • #21
              Worse, the collet does not release when the clamping force is removed. It continues to grip the tool. The threaded ring has to be removed and the collet pried out of the holder.
              I thought those collets were similar to a ER collet- in which first you snap the collet into the nut,- before inserting into the chuck.
              The way you describe it sounds like you are putting the collet into the chuck and then screwing on the nut which is not the way ER collets work.
              Steve

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              • #22
                yes the collet snaps into the nut before you put in the holder, and when you loosen the nut, it pulls the collet out of the holder. So far my set works fine, my only regret was not getting it sooner.

                Jack
                jack

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