Subject: Re: 33JT and 3JT Chuck Tapers...

From: "John W. Hall" <[email-masked]>
Date: Mon, 6 Nov 95 23:43:36 -0300

On 6 Nov 95 07:21:48 EST, 
Kevin Pinkerton  <[email-masked] > wrote:

>>Stamped on the body of the chuck is "RJ3-16L".  Am I to assume that this 
>>is a "3JT" taper?  Will a 33JT taper tool fit okay?
>
>Don't assume RJ3 = 3JT. My Sears drill press has a threaded on chuck. The one 
>we have at work (non-sears) is also threaded on. Try to unthread the chuck. My 
>Sears chuck as a ring that sits right above the chuck (actually it is part of 
>the chuck) and the ring has several holes in it (three I think) that you can 
>put the handle of the chuck key in and unscrew the chuck. It may take a pipe 
>wrench to unscrew it the first time. 
DON'T USE A PIPE WRENCH. Take the time to make a pin spanner out of a 
piece of strap with a screw run through it to fit in one of the holes. 
This is much kinder to the machine and isn't hard to make. Also note 
that taper mounted chucks also have a ring above to force the chuck 
off with. Set a board on the table to protect it and the chuch when it 
comes flying off.

John

---

From: "Matt G. Dralle" <[email-masked]>
Date: 7 Nov 1995 09:13:30 GMT

>>wrench to unscrew it the first time. 

No, my chuck is not threaded - it is a taper maybe 1.5" long.  I have had the
chuck off.

So who make a good quality self-reversing tapping tool for the 3JT taper?  I
need to tap 4-40 and 6-32.  It would be nice to just pull the chuck off and 
pop the tapper on, but I could live with other options.  Any suggestions?

Thanks!

Matt