Adapter

C

COPE 19

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Being new to the hobby machining world is there an adapter so I can use R8 collets on my 2 1/4-8 lathe spindle? My mill uses R8's so I have those on hand. If not are there any collets that can be used on an old Enco lathe?
 
The spindle threads do not matter here, only the spindle internal taper. See if it is MT4 or ?. You might be able to find an adapter from MT to R8, but I have never seen one. You might be able to make one out of a MT shank off a drill or other tool, or a semi finished arbor. a feature would need to be added to eject the adapter from the taper. The major disadvantage of your idea is that R8 collets do not allow the stock to go through the bore like 5C and others do.
 
There are no internal threads. The lathe spindle that the chuck screws onto is a 2 1/4-8TPI external thread. The chuck itself has the internal threads or taper. I don't know if such an adapter exists. Just thought that I could use them if they did.
 
Bob Korves said:
The spindle threads do not matter here, only the spindle internal taper.
Click to expand...

Not quite true Bob.

Adapters like these:
http://www.bealltool.com/products/turning/colletchuck.php
http://www.bealltool.com/products/turning/bigchuck.php
screw onto the lathe spindle threads and allows use of collets.

I posted a whack of info about them here:
http://www.hobby-machinist.com/threads/is-there-a-definitive-article-on-collets.36227/#post-308310

If you do have a hollow spindle then long work can extend thru that hole.

I have never used R8 tooling.

-brino
 
I made a r8 setup for my 10" atlas, worked ok but was kind of touche as far as the draw bar went, it liked to through it out round on the part. The draw bar had to king of float. I sold it sometime back. I bought a 5c set up but don't use it much.
 
That's exactly what I am looking for, now if I can just find a set that fits my 2 1/4 spindle. Thanks to all that helped.
 
brino said:
Not quite true Bob.

Adapters like these:
http://www.bealltool.com/products/turning/colletchuck.php
http://www.bealltool.com/products/turning/bigchuck.php
screw onto the lathe spindle threads and allows use of collets.

I posted a whack of info about them here:
http://www.hobby-machinist.com/threads/is-there-a-definitive-article-on-collets.36227/#post-308310

If you do have a hollow spindle then long work can extend thru that hole.

I have never used R8 tooling.

-brino
Click to expand...
Indeed, Brino, I had completely forgotten about collet chucks, mostly due to the OP's request for using R8 collets. I am pretty sure there are no R8 collet chucks to go on lathe spindle threads for sale. My other point was that R8 collets are held in place with a 7/16-20 drawbar, so no stock can go through the collets. If the work cannot go through the collet then the hollow spindle is of no use.
 
COPE 19 said:
There are no internal threads. The lathe spindle that the chuck screws onto is a 2 1/4-8TPI external thread. The chuck itself has the internal threads or taper. I don't know if such an adapter exists. Just thought that I could use them if they did.
Click to expand...
We are looking for an internal spindle taper, not internal threads. What brand and model lathe is it?
 
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