Arbor for No.0 Jacobs Chuck?

Arbor for No.0 Jacobs Chuck?

This topic has 6 replies, 5 voices, and was last updated 13 February 2020 at 17:32 by Martin Connelly.

Viewing 7 posts - 1 through 7 (of 7 total)

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13 February 2020 at 13:01 #452027
Bo’sun
Participant
@bosun58570
Good afternoon All,

I have a No.0 Jacobs Chuck, which I want to put on a 2MT arbor. The designation on the Chuck reads "No.0 0-5/32 H78". I assumed that H78 was the mounting interface, but can't find any reference to a suitable arbor.

Any ideas you clever lot?
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13 February 2020 at 13:01 #19624
Bo’sun
Participant
@bosun58570
13 February 2020 at 13:10 #452031
Thor 🇳🇴
Participant
@thor
Arc has drill chuck arbors for Jacobs No.0. Code 040-020-00400 for an arbor with M10 drawbar thread, 040-020-02100 for an arbor with tang.

Thor

Edited By Thor on 13/02/2020 13:13:04
13 February 2020 at 13:28 #452033
not done it yet
Participant
@notdoneityet
If I were to assume anything, I might assume that the code was for the chuck key that fitted that chuck?
13 February 2020 at 16:41 #452051
Roderick Jenkins
Participant
@roderickjenkins93242
Just to confirm that 0 chuck takes a 0 Jacobs Taper. I turned one on to the end of the spindle for the drilling head on my George Thomas pillar tool.

Rod
13 February 2020 at 16:55 #452053
Bo’sun
Participant
@bosun58570
Thank you Rod,

I've just measured the taper in the chuck (as best I could) and it pretty much measures up to the JT0 specification.

Can I assume then, that the JT taper number is the same number as the chuck size?
13 February 2020 at 17:32 #452059
Martin Connelly
Participant
@martinconnelly55370
Machinery's Handbook I have gives maximum drill size for each size of Jacob's Taper under normal drilling loads and for JT0 it is 5/32".

Otherwise it is rare for the chuck designation to match the Jacob's Taper size.

Martin
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