How do I set and turn very small internal taper (ER11)

Gallery, Projects and General > How do I??

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John Stevenson:
Yes turn a taper up then mill it down to a gnats left bollock under half the diameter then harden it and hone the flat face to get a cutting edge.
Used for cleaning up with loads of cutting oil.

John S.

dickda1:
I assume that the heat treat operation would limit the size of the D-bit possible - like a 2 or 3 MT would require a tool post grind post heat treat?
-Dick

mike os:
tapered end mill?

Lew_Merrick_PE:
Mike, >> Tapered end mills? << Yes, they make them with tapers for milling clearances in dies. They most normally come in 0.5° through 2° taper. You have to go to specialty cutter houses these days to find them, but they do exist.

PekkaNF -- If you know the axial taper (cited at 8°) you need accurately, you can make up a taper gauge fairly easily. Start with a piece of stock (AL would be fine) that is (say) 100 mm X 45 mm X 10 mm thick. Drill & ream three holes to press fit a (say) 4 mm dowel pin. The first hole will be (say) 10 mm in (in both axis) from the corner of your stock. The second hole will be (say) 80 mm (along the 100 mm dimension) from the first and also 10 mm in from the edge. The third hole will be (say) 69.32 mm away (along the 100 mm dimension) and 9.74 mm away from your other pair of holes. Press the dowel pins into (say) the first two (10,10 and 90,10) holes and use them to line up the gauge in your vise and mill the edge clean with minimum clean-up. Press out the (90,10) dowel pin and press it into the (79.32,19.74) hole and repeat the process. Move the dowel pin back to the (90,10) hole and use it to line up the gauge in a vertical orientation such that you can centerdrill the (100 mm nominal) ends of your gauge in a line parallel to the dowel pins spaced at 80 mm. Press out the dowel pins, mount it in centers, and prop it such that it sits with the tapered face perpendicular to the bed of your lathe. You now have a long face to indicate your compound's angle against.

A small bit ground with a boring tip will clean up your hole very nicely.

Bogstandard:
This part of a post of mine shows how I set up and made a taper for an er32 collet.

Yours is much the same but slightly smaller.

http://madmodder.net/index.php?topic=2249.msg23587#msg23587

Bogs

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