Old drill chuck...fine fine threads....educate me?

[1982fxr]

This is the chuck that is on my Companion drill press. Probly late 30's or very early 40's. The threads are finer than 1/2" x 20. 1/2" by 28?

Soooo this chuck is missing the top half that opens and closes it I guess? Where can I get a replacement chuck for this--inexpensive?

If this was a homeowner brand from back in the day why does it have a fine fine threaded chuck like this? I'd think it would be coarse and therefore less expensive to make?

thanks for any help

dammit getting fatal error when posting pics

 

[1982fxr]

hmmmmmmmm

 

[FMJSS]

I don't know about this exact drill press, but the threads could be anywhere from 1/2-28, 32, 48, 56, even 80 threads per inch, though 48, 56 and 80 Tpi would be pretty crazy.
Get yourself a thread gauge to help identify the thread pitch then look on line for one that is the same.

 

[Outlawmws]

Need a closer up pic, but fine threads are not a big deal. you can use other size bolts as a thread gauge, if the thread from a 1/4-28 NF bolt will mesh with your treads then that is what it is.

Fine tread might have a couple of reasons to go for:

Finer threads are not as deep and you can make the parts thinner.

Finer adjustment or control of an adjustment

You can get more tightening pressure with less torque on the fastener the finer the thread is.

Many of those chucks in that era typically had retention systems since they also touted these as multipurpose tools, and included routing as one of the purposes. Today the Chicom DP makers provide X/Y tables, and if you try it on those without the retention system, the tapered shanks come off when side loaded (Not Good)

 

[tool_scrounge]

Standard keyless chuck used on post drills in the early 1900's. Are you sure it does not work? Just rotate the chuck by hand with the spindle stationary to tighten on a drill. Just unscrew it completely to examine (dirt simple). I am sure I have a few in a drawer, but there are a couple of different types so a photo of it (especially of the male threaded part on the spindle with the chuck removed) will tell which type it is.

 

[larry_g]

Standard keyless chuck used on post drills in the early 1900's. Are you sure it does not work? Just rotate the chuck by hand with the spindle stationary to tighten on a drill. Just unscrew it completely to examine (dirt simple). I am sure I have a few in a drawer, but there are a couple of different types so a photo of it (especially of the male threaded part on the spindle with the chuck removed) will tell which type it is.

Concur with it being a 'keyless' chuck. Screwing the outer onto the spindle should run the top of the jaws into the end of the spindle causing them to close up on the drill shank as chuck is screwed further onto the spindle. If you remove the whole chuck you should find that the top of the chuck will unscrew from the body. Once apart you can clean and lube and repair the spring if necessary. I have found those chucks on hand held drill also. You can also get a modern chuck with a 1/2-20 thread http://www.jacobschuck.com/images/products/JC-003 Multicraft Series No Crops.pdf

lg
no neat sig line