It is too long – you need to grind the flat / tang off

Find a tool that does fit, degrease the end, stick a dollop of plasticine on the top, squirt some WD40 up the spindle to make it non-stick, shove the test tool up it and get an impression of the free space and shape of it.

This has been stated numerous times but let's say it again, the tang does not drive a morse taoer drill, it is for ejection purposes only.

Martin C

Hi Adam,

FWIW, I just tried a tanged MT3 in my Weiss wmd30lv, and it fit fine.

It would seem seem that the spindle socket is short, but that appears implausible, unless all the models, in that series, are as such.

Just to reiterate, have you tried turning the tool whilst pushing upwards. It is a very positive fit.

ATB,

Daniel

My understanding is that Morse Tapers come in two basic forms; with and without tangs.

The tang is essential to machines (mainly drills) with an ejector slot or some other mechanism for dismounting the tool. MT tooling is also available without the tang, instead being threaded to take a drawbar.

Logically it makes sense for the Chester to NOT expect a tang. Tangs are most useful on a drill where most of the cutting force tends to tighten the grip. Milling applies strong sideways forces likely to break a taper grip: milling needs some positive way of keeping the grip tight, like a drawbar, which won't work if a tang is in the way.

It's a triple gotcha:

• tapers with tangs that won't fit in certain machines unless you grind the tang off!
• tapers without tangs that can be difficult to remove from machines expecting a tang.
• otherwise compatible tools that can't be swapped between different MT3 machines.

If your drills are only for use on the Chester, I'd grind the tangs off.

To add to the confusion, I've also come across MT tooling that doesn't have a tang or a drawbar thread. I think these are intended to fit lathe tail-stocks where a shorter than normal taper helps reduce overhang and vibration.

Dave