On older lathes and some mills/shapers the flat tang is
locked into place by a drift. It keeps the taper from spinning.
Spinning a taper can make the holding taper slick.

Martin

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