How do I get my chucks off?

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David Jupp:
I had a Jacobs chuck stuck fast on a 1MT shank - that's so small that there is nothing for wedges to push against.

I almost gave up and drilled/tapped a hole through rear of the chuck to use a screw to push things apart. Before resorting to that I put the chuck in the freezer for a few hours, then returned to workshop. Quickly gripped end tang of 1MT shank in vice jaws, applied flame from a very small gas torch to back face of chuck (just to warm it up a bit) - one sharp tap with a hammer and drift separated the chuck from the shank.

The temperature differential just loosened things enough that removal was simple.

vtsteam:
Well one thing is for sure David, I won't have to resort to a refrigerator to cool the chuck -- my shed was at 18F this morning. :)

Jasonb:

--- Quote from: David Jupp on February 14, 2013, 09:23:05 AM ---I had a Jacobs chuck stuck fast on a 1MT shank - that's so small that there is nothing for wedges to push against..

--- End quote ---

The wedges come in various sizes to suit the taper/chuck, I expect you wedges were for a larger size.

J

David Jupp:
Jason - with the combination I had the JT was larger than the MT where they met - there was no shoulder to get wedges behind.

vtsteam:
WooHoo!!!!

:ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb:

:mmr:

:bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow: :bow:

Thank you, thank you! I now have a chuck for my mill.

Info:

Wedges made from angle iron. One leg cut off to 1/2".
There was a big score near the mouth of the chuck, the rest of the taper looks okay internally, the MT4 adapter also shows the score mark
The reason it couldn't be pressed out? There is no through hole axially. Lester was pushing the drift against solid metal base! :bang:
The other 2 chucks? Haven't done them yet, I need to thin the wedges more so they will fit in the gap :dremel: -- this one had a wider gap, and it is the main one I wanted to rescue for my mill. I have an R8 to JT33 adapter to fit it and it has a 1/2" capacity.

Psyched!

:beer:

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