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  1. #1
    Join Date
    Jan 2007
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    1332

    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
    Join Date
    Nov 2012
    Posts
    591

    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
    Join Date
    Dec 2013
    Posts
    5717

    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
    Join Date
    Jan 2007
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    1332

    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
    Join Date
    Nov 2012
    Posts
    591

    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
    Join Date
    Jan 2007
    Posts
    1332

    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
    Join Date
    Nov 2012
    Posts
    591

    Re: Floating Reamer Holder

    Yes, why wouldn't you? :-D

  8. #8
    Join Date
    Jan 2007
    Posts
    1332

    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
    Join Date
    Nov 2012
    Posts
    591

    Re: Floating Reamer Holder

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

  10. #10
    Join Date
    Jan 2007
    Posts
    1332

    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
    Join Date
    Nov 2012
    Posts
    591

    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
    Join Date
    Dec 2009
    Posts
    458

    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

  13. #13
    Join Date
    Jan 2007
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    1332

    Re: Floating Reamer Holder

    I milled two slots with just enough radial play for +- 0.010" of float for the 1/4" SHCSs

    Don
    .

  14. #14
    Join Date
    May 2007
    Posts
    1026

    Re: Floating Reamer Holder

    Just out of curiosity, what is the reason to bore then ream as opposed to just one or the other?

  15. #15
    Join Date
    Oct 2011
    Posts
    477

    Re: Floating Reamer Holder

    I bore first to be sure that I have a straight hole located in the right position. I you just ream a drilled hole, the reamer will likely follow the axis of the drilled hole which may or may not be straight or true. The reaming after boring is done to size the hole on the axis of the bored hole. The floating reamer holder is used to compensated for any runout in the system. This includes spindle bearing runout, spindle taper runout, toolholder runout and even the runout between the shank and the cutting end of the reamer.


    If you ever get into chambering rifles, you will find that the difference in a good chamber (accurate rifle) and a poor chamber is a floating reamer holder.

    gary

  16. #16
    Join Date
    May 2007
    Posts
    1026

    Re: Floating Reamer Holder

    So the sizing is that much better with the reamer? Naive me figured if you could bore to within .010" you could just dial it right to size and be done with it, but then I'm rarely trying to hit a hole within +/- .0005", so I wouldn't know!

  17. #17
    Join Date
    Jan 2007
    Posts
    1332

    Re: Floating Reamer Holder

    Quote Originally Posted by sansbury View Post
    So the sizing is that much better with the reamer? Naive me figured if you could bore to within .010" you could just dial it right to size and be done with it, but then I'm rarely trying to hit a hole within +/- .0005", so I wouldn't know!
    That's exactly why I first bored and then reamed the holes. Also I found that I needed a 0.376" hole instead of a 0.375" hole. A simple matter of using a 0.001" oversize reamer. Dialing in the bore head is not so fun.

    Don

  18. #18
    Join Date
    Oct 2011
    Posts
    477
    Quote Originally Posted by sansbury View Post
    So the sizing is that much better with the reamer? Naive me figured if you could bore to within .010" you could just dial it right to size and be done with it, but then I'm rarely trying to hit a hole within +/- .0005", so I wouldn't know!
    If better can also be read as easier then the answer is yes. You can sneak up on a hole with a boring head and make it any size you want but it can be a bit tedious.

    Gary

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