"DeepDiver" wrote in
:

I happen to have a nice Nikken metric boring head that was designed to
fit a 26mm BT-flange holder. This boring head has a 26mm dia x 26mm
straight cylindrical shank with two radial holes at 90-deg to accept
locking set screws or pins.

Of course, my mill doesn't have a BT spindle; it has an R8 spindle. So
my idea was to use an end mill holder as an adapter for this boring
head. But that presents its own problems as I have yet to encounter a
26mm end mill holder. (Anyone know a source for these? I find it
amazing that the US machining industry is still so firmly entrenched
in the English system.)

Short of finding a 26mm holder, my next thought would be to buy a 1"
end mill holder (25.4mm) and try to modify it to accept the 26mm shank
of my boring head. I just don't know how successful that plan might
be. For one thing, I suspect that the bore of an end mill holder is
hardened and ground, so I will probably have a tough time trying to
bore 0.6mm off the inside diameter in my lathe. Another possibility
would be to use an abrasive cylinder hone to enlarge the bore of the
holder. But that may not be a very accurate operation as I only have
the low-cost, sprung-arm hones that are common in auto parts stores.

Any thoughts or advice?

Contact these folks, bet they have one. May not be cheap though.

Lyndex-Nikken, Inc.
1468 Armour Blvd.
Mundelein IL 60060
Phone: 800-543-6237
Fax: 847-367-4815

--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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