On 2010-03-25, danmitch wrote:
Well, a bigger Morse tape will hold a larger cutter BEFORE the cutting
forces make it come loose! :-((

These things DO exist (Morse and B&S tapers are all I've seen), and
WERE used, probably mostly a long time ago. I've seen a bunch of
such tooling, including milling cutters with integral Morse tapers,
and NO drawbar threads. IIRC, all these cutters had tanged tapers.

As I said earlier, it CAN work, sometimes, maybe, if the tapers are well
seated (probaly driven in with a mallet). If you've ever tried to
UN-seat a well seated Morse taper, you'll know just how tenacious these
self-locking tapers can be.

Took me at least a minute, and I had to get a 2 lb sledgehammer to get
one of those MT4 holders ouf of an MT5 adaptor.

I expect their biggest weakness was in interrupted cuts, where the
hammering would tend to work them loose.

Today they're mainly a curiosity. I wouldn't recommend using them.
Considering what a mess a cutter can make if it slips and puuls out in a
collet, I can't immagine how bad it's be if they pulled out of a taper
during a heavy cut. It's surely wreck the cutter and work, and maybe
damage the machine.

The few M2 size I have mostly had soft enough shanks that I drilled and
tapped most for a 3/8 drawbar.

I intuitively agree with you, but I must point out, these holders are
very obviously used and they were used a lot. They also look like they
have not seen crashes. I can take pictures if anyone is interested,
they are quite unusual.

i