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  1. #1
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    Floating Reamer Holder

    Made a new 3/8" floating reamer holder using parts from the junk box, 3/8" TTS holder, old 3/8" drill chuck and self-lubricating 2" diameter Turcite-A round sandwiched in between.

    DonAttachment 415224

  2. #2
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    Re: Floating Reamer Holder

    Interesting! I always thought reamers were for precision holes, where the possible runout of a chuck would get in the way?

  3. #3

    Re: Floating Reamer Holder

    A reamer will follow an existing hole, and you want it to float to be able to do that.
    Jim Dawson
    Sandy, Oregon, USA

  4. #4
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    Re: Floating Reamer Holder

    Quote Originally Posted by jwatte View Post
    Interesting! I always thought reamers were for precision holes, where the possible runout of a chuck would get in the way?
    The idea is for the reamer to float with about +-0.010" of X-Y movement so the reamer follows the hole. I first drill a hole with an undersized drill then using a single point tool in a boring head open the hole to about -0.010" and finish to size with the floating reamer. These holes are then used to locate my part in a fixture held with 3/8" internally expanding XYZ pins. https://www.miteebite.com/products/m...xpansion-pins/

    Don

    Attachment 415246.

  5. #5
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    Re: Floating Reamer Holder

    Again, interesting! Learn something new. I've always been using reamers right after drill without re-clamping the part, so they are as coaxial as possible. This is an interesting other possibility, especially if I somehow need to re-clamp the part between hole making and reaming!

  6. #6
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    Re: Floating Reamer Holder

    Quote Originally Posted by jwatte View Post
    Again, interesting! Learn something new. I've always been using reamers right after drill without re-clamping the part, so they are as coaxial as possible. This is an interesting other possibility, especially if I somehow need to re-clamp the part between hole making and reaming!
    I am using the floating reamer even though I don't re-clamp.

    Don

  7. #7
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    Re: Floating Reamer Holder

    Yes, why wouldn't you? :-D

  8. #8
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    Re: Floating Reamer Holder

    The floating reamer holder on my 1100. Why the Kurt D688 was mounted on a subplate with no Y-axis overhang. Used all 10.5" of Y-axis travel and 8.75" of the 8.8" opening of the D688 vise.

    Don


    Attachment 415388

  9. #9
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    Re: Floating Reamer Holder

    Nice. Looks very stretchy :-)
    How much of the Z did you have left?

  10. #10
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    Re: Floating Reamer Holder

    Sketchy really. Sounds like trolling. Enough Z -axis travel to run the program, change tools, and make the holes. Do you need more?

    Don

  11. #11
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    Re: Floating Reamer Holder

    Do you need more?
    "Clearance is clearance." All you need is a few thou :-)

    My point is that it looks like a nice way to get right up at the limits of the machine. Just curious about how close, exactly, you managed to get!

  12. #12
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    Re: Floating Reamer Holder

    Quote Originally Posted by Don Clement View Post
    Made a new 3/8" floating reamer holder using parts from the junk box, 3/8" TTS holder, old 3/8" drill chuck and self-lubricating 2" diameter Turcite-A round sandwiched in between.

    DonAttachment 415224
    I guess it's true that "Great Minds Think Alike." I use a very similar set up to ream the chambers on the rifle re-barreling projects I do on my own rifles. I found that the Tormach 3/8" tool holder fits the bore of my lathe tail-stock just loose enough to be able to use it as a "Floating Chamber Reamer Holder." As luck would have it, my home made barrel nut wrench fits right onto the outside diameter of the same Tormach tool holders so it give me a secure handle to guide my chamber reamer right down the center of my barrel-blank's bore.

    I'd be interested to see exactly how the front section and the rear section of your setup fits together. My set up just floats inside the bore of my tail stock. Yours seems to be more ridged with the floating part being in the junction between the front and back parts. Is there any chance of getting you to show exactly how much movement it has in any direction? It would be nice to have a slightly more rigid setup like yours with just enough "Float" to allow for my reamer to self-center.

    MetalShavings

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