Re: Removing my drilling chuck

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Re: Removing my drilling chuck Richard 06-16-2008
Posted by Richard on June 16, 2008, 6:31 pm
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 For some combinations of sizes like MT2-JT6, a pretty common tailstock
combination, there isn't enough shoulder for the wedge to get hold of.
The Jacobs recommended method is then to drill a hole through the
(un-hardened) centre of the chuck and punch the arbor out with a
drift.

http://www.jacobschuck.com/drill-chuck-install.asp

I was surprised, but as I say, it is recommended by Jacobs and it has
worked for me.

Richard

Posted by BarryK on June 17, 2008, 2:52 am
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I had a look at the wedges in the Arc Euro catalogue and the reason I'd
not noticed them before is that, to me, the shape appears to be all
wrong.....

I expected them to be just the same as a normal wedge, maybe a bit
squarer and wider and with a slot in the centre - but with a much
shallower angle - Very thin at the front end and maybe 10mm thick at the
back.

The Arc Euro weges look more like the business end of a wood chisel
(now there's a thought....)

I haven't found an illustration of the Jacobs ones yet.

Temporarily, I'm thinking of milling a couple of wedges from ally or
brass and 'skinning' the sliding surfaces with some 20 thou or so Feeler
strip.

Thanks again for all your assistance.....

Barry

PS - hadn't thought about drilling through the chuck - sounds a bit
drastic but it would certainly work.


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BarryK
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Posted by Bob Minchin on June 17, 2008, 12:45 pm
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Richard wrote:
> For some combinations of sizes like MT2-JT6, a pretty common tailstock
> combination, there isn't enough shoulder for the wedge to get hold of.
> The Jacobs recommended method is then to drill a hole through the
> (un-hardened) centre of the chuck and punch the arbor out with a
> drift.
>
> http://www.jacobschuck.com/drill-chuck-install.asp
>
> I was surprised, but as I say, it is recommended by Jacobs and it has
> worked for me.
>
> Richard
I've drilled a hole and tapped it for a whitworth thread to push the
taper out. Tighten the bolt reasonably tight then hit the head wiv
hammer and the taper jumps out so be ready to catch it.

Bob

Posted by BarryK on June 18, 2008, 2:20 am
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Bob Minchin Wrote:
> Richard wrote:
>
> > Richard
> I've drilled a hole and tapped it for a whitworth thread to push the
> taper out. Tighten the bolt reasonably tight then hit the head wiv
> hammer and the taper jumps out so be ready to catch it.
>
> Bob

That's a good one....if you're gonna drill a hole anyway, it makes
sense to tap it for future ease of release.

Thanks Barry


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