3 Jaw chuck w/ R8 mount

[Renegade]

I have a three jaw chuck with an integral R8 taper for a mount. I have racked my brain and can not think of any situation where it would be useful. It came with an older mill and the guy I got the stuff from had never used and said he bought it because it looked cool. Does anyone know of a practical use for it before I send it down the road again with the mill?

 

[benmychree]

If it were 5-C taper, it could be useful, but few work holding devices use R-8; maybe someone on E Bay would think it as neat as you did --- and pay for the honor of owning it.

 

[hman]

I'll assume you mean a lathe-style 3 jaw chuck, not a drill chuck (which also has 3 jaws). What size is the chuck?
I've read about some people using a milling machine as a "poor man's lathe," by holding and spinning the workpiece in the spindle and somehow mounting a cutting tool on the table. Your chuck is probably meant for something like that. If you have a lathe, this chuck would definitely be surplus for you. See if you get any nibbles by offering it on Ebay or your local Craigslist equivalent.

 

[Jim F]

 

[mickri]

The R8 shank has to be removable from the chuck. Take it off and see what you got.

Some pictures would be nice.

 

[Jimsehr]

I have a three jaw chuck with an integral R8 taper for a mount. I have racked my brain and can not think of any situation where it would be useful. It came with an older mill and the guy I got the stuff from had never used and said he bought it because it looked cool. Does anyone know of a practical use for it before I send it down the road again with the mill?

I think it might be useful to hold metric shank tooling. If you don’t have metric collets.

Jim Sehr

 

[Renegade]

Thanks all. Yes, it has a 5” 3 jaw lathe style chuck and the R8 is part of the back of it (China special). I did think of cutting it off but it’s probably not worth the effort based on the quality of the chuck itself. I agree that it is probably intended to allow the mill to be used as a lathe. But I have two lathes so eBay it is!

 

[Flyinfool]

Pics would be nice.
One of us may have a use for it.
Curiosity is also rampant on this site.
I never heard of such a thing.

I did some looking and there are some small lathes with R8 spindles.

 

[RJSakowski]

I have a three jaw chuck with an integral R8 taper for a mount. I have racked my brain and can not think of any situation where it would be useful. It came with an older mill and the guy I got the stuff from had never used and said he bought it because it looked cool. Does anyone know of a practical use for it before I send it down the road again with the mill?

My Tormach CNC cn be used as a vertical CNC lathe. However, it is limited in diameter to the maximum capacity of an R8 collet. A small three jaw chuck with an R8 shank would expand that range. I wouldn't want to go too large on the chuck; 3" or possibly 4" but it would be a useful addition.

 

[Larry$]

I've got a 3" on an R8. Got it before I had a lathe. Very limited usefulness!