On Apr 8, 2:48*pm, "Joe AutoDrill" wrote:
I've always thought the tang at the back of a Morse Taper was for
insurance... *Or in other words, if the tool slipped, the tang provided
drive.

I was told today that a MT1 has more holding power than a Jacobs J33 taper
without the tang...

This makes me wonder... *Is the tang for driving the tool rotationally,
material to remove the taper without damaging it, combination?

Thoughts? *Charts on their ratings without the tang, etc?

Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills:http://www.AutoDrill.com
Multiple Spindle Drills:http://www.Multi-Drill.com
Flagship Site:http://www.Drill-N-Tap.com

V8013-R

Joe,

The tang is merely to separate the taper from the socket with a flat
taper drift.

The taper is to do all the driving.

This becomes painfully apparent in the larger taper and drill sizes:
If a #4 or #5 MT slips when driving a large drill the tang is easily
sheared off. With a #3 MT it depends on the type of tool. With # 2
MT and smaller the tang generally is of sufficient strength to drive
the tool in case of slippage.

However on many lathe tail stocks there is no slot to engage the tang,
and the taper turns in the socket when improperly seated due to oil,
burrs or dents, chips, combined with laziness or improper instruction
of the operator.

Wolfgang