Another Fobco Chuck

[spencerd72Participant @spencerd72]

Dear all,

 

I have no idea how to remove the chuck from my recently acquired Fobco Star 9see pics below).

I have seen an old post in this parish where there was a knurled ring that unscrewed and pushed the chuck off. My drill does not seem to have this. Any ideas?

Many thanks in advance,

Dominic.

[noel shelleyParticipant @noelshelley55608]

Extend the quill and see if there is a slot in it – if so then it will be 2MT and need a tapered drift to push the 2MT shank out of the quill shaft. If not then a Jacobs Taper in the chuck, the chuck may have this fact marked on it. Gentle heating and a forked drift should get it off, patience is needed. Good Luck. Noel.

[spencerd72Participant @spencerd72]

Many thanks Noel,

There isn’t a slot, even with the quill extended, so I suppose it’s a case of getting a good forked wedge and tapping with some heat.

I can’t see any markings on the chuck to describe the taper. It says it’s British made, in Sheffield, shows the capacity and says it’s a Jacobs number 34.

Thanks again from the reply.

Dominic.

[noel shelleyParticipant @noelshelley55608]

Dominic, whilst I would expect it to be a JT I have seen ones with an internal thread, I bought one in the early 70s to fit a Myford, but it told me the thread – you say yours has no info. Noel.

[spencerd72]

On spencerd72 Said:

Many thanks Noel,

There isn’t a slot, even with the quill extended, so I suppose it’s a case of getting a good forked wedge and tapping with some heat.

I can’t see any markings on the chuck to describe the taper. It says it’s British made, in Sheffield, shows the capacity and says it’s a Jacobs number 34.

Thanks again from the reply.

Dominic.

As far as I can see, all Jacobs 34 are all tapered fit, in the current range anyway.
http://www.jacobschuck.com/plain-bearing-keyed/17.html

Really, I believe you should uses opposed tapered wedges, specifically for the purpose, rather than just hitting on one side with the likes of a ball joint splitter.
http://www.jacobschuck.com/uploads/ueditor/file/20200604/1591240204146153.pdf

They are available, but come at a cost.
http://www.jacobschuck.com/search/index/tag/id/97.html

Bill

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