Shopsmith Jacobs 3326 Chuck Key Needed

hobbyist · Post by **hobbyist** » Fri Jan 30, 2009 4:09 pm

Here's two more for the chuck library...

Left:
Cushman C13LS, JAPAN
Cap. 5/64 - 1/2
Jacobs KK chuck key fits (I don't have the original Cushman key)

My machine is a 1981 model that I purchased used. I believe this was its original chuck supplied by Shopsmith.

Right:
Jacobs 3326
Hartford Conn., Made in USA
Cap. 5/64 - 1/2
Jacobs K 32 H chuck key

I bought this chuck on eBay last year. It's a beautiful old chuck that looks to have never previously been used. Interestingly, the chuck key doubles as a 5/32" hex wrench. I wonder if these keys were specially made for Shopsmith long ago. This is an outstanding chuck and reliably locks up with almost no runout every time.

Ray

james.miller · Post by **james.miller** » Fri Jan 30, 2009 4:22 pm

I just checked an old 3326 chuck that came with a 55 greenie.

The key is a K32H with hex rod for a handle.

This chuck will not close down far enough to chuck up a 1/16" drill bit.

james.miller · Post by **james.miller** » Fri Jan 30, 2009 4:32 pm

Also check out this post https://forum.shopsmith.com/viewtopic.php?t=2941

Jacobs still offers a version of it, the 3326A, it won't close on a 1/16" bit either.

hobbyist · Post by **hobbyist** » Fri Jan 30, 2009 5:02 pm

james.miller wrote:This chuck will not close down far enough to chuck up a 1/16" drill bit.

For drill bits less than 5/64", I like to use a Starrett Pin Vise (with the knurled pin vise handle cut off). These pin vises are designed for chucking, though the Shopsmith chuck bore is not deep enough to accommodate the length of the handle.

Here's my modified 240A pin vise...

Ray

bucksaw · Post by **bucksaw** » Fri Jan 30, 2009 5:06 pm

It's too bad Shopsmith did not keep a master list of all the Chuck and Keys shipped over the years. It would have save us some hassle.

bucksaw · Post by **bucksaw** » Fri Jan 30, 2009 5:10 pm

I keep one of these Makita chucks on hand for small bits.

alaskanexile · Post by **alaskanexile** » Fri Jan 30, 2009 7:56 pm

I have a Jacobs 3326 chuck with a K32 key. Believe it came orginal with my 56 greenie. Although clearly stamped on the chuck is, 4/64 - 1/2", I have many time successfully clamped a 1/16 bit in it. Now you guys have me wondering what's in there hanging unto that bit.
Roger

charlese · Post by **charlese** » Fri Jan 30, 2009 10:59 pm

I don't know much about the differences in dill chucks, but I have successfully chucked up a #6 bit in my Shopsmith chuck. This is a wire drill bit that is a lot smaller than 1/16". I used it for drilling pilot holes for staples in shutter louvers.

Next time I'll have to strongly consider a Starrett Pin Vise.

charlese · Post by **charlese** » Sat Jan 31, 2009 1:10 pm

charlese wrote:... I have successfully chucked up a #6 bit in my Shopsmith chuck. This is a wire drill bit that is a lot smaller than 1/16". I used it for drilling pilot holes for staples in shutter louvers.

Whoops!!! Correction! - - It was a #56 wire gauge bit, not a #6. The bit measures .046" But now I know about a Starrett Pin vise.

With what I read, I'm surprised the Shopsmith chuck worked, but it did nicely.

horologist · Post by **horologist** » Sat Jan 31, 2009 2:41 pm

I have had mixed results with the pin vise mounted in the Jacobs chuck arrangement. In general the accumulated errors can wreak havoc on both your work and the drill bit. Chinese pin vises will not work here! I have an Albrecht sensitive feed chuck (missing the outer sleeve) that I use. These chucks appear regularly on ebay with a 1/2" shaft. This would probably work well with the 1/2" router bit chuck. For holes near 1/16" it really isn't that critical and odds are a Starrett pin vise would rarely give trouble. I frequently use the wire gauge bits between 61 and 80 and have pivot drills down to 0.1mm (0.004").

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