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
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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
Interesting! I always thought reamers were for precision holes, where the possible runout of a chuck would get in the way?
A reamer will follow an existing hole, and you want it to float to be able to do that.
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.
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!
Yes, why wouldn't you? :-D
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
Nice. Looks very stretchy :-)
How much of the Z did you have left?
Sketchy really. Sounds like trolling. Enough Z -axis travel to run the program, change tools, and make the holes. Do you need more?
Don
"Clearance is clearance." All you need is a few thou :-)Quote:
Do you need more?
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!
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