Abdullah Eyles wrote:

John Rumm wrote in message ...
While flicking through the Axminster catalogue the other day (looking
for an elusive long 7mm SDS drill bit!) I noticed that they had a range
of drill bits with morse taper shanks designed to be inserted directly
into the quill of a pillar drill.

This started the train of thought - What is the "proper" way go about
removing something (i.e. the chuck for starters) from a morse taper
interference fit?

They are normally removed by inserting a metal wedge through a hole at
the back of the taper and hitting it with a hammer, if necessary.


The correct name for the wedge is drill drift. For anyone who did an
engineering apprenticeship (a real one, in the old days) this would be
one of the first things they ever made - by hand using just a hacksaw
and a selection of files. Ah, happy days :-) I still have mine
somewhere. You can make your own, from a piece of angle iron or similar.
They are not hardened or made from "fancy" steel because they need to be
softer than the drill bit and the quill in the pillar drill to avoid damage.

You can buy them, e.g. http://www.cromwell.co.uk/category?code=3301 Note
that there are different sizes depending on the size of the Morse taper.

http://www.grm.net/~shlosser/mttaper.htm has a detailed description of
Morse Tapers and such like... The picture "MTsSlot.jpg" shows this
removal slot clearly, but on the page other pictures are unfortunately
placed on top of it.