Found one of these in the warehouse today, no idea where it came from. The Chuck is by Union, is 10”, has 3 independent jaws, each with a 1/2” male square drive protruding outside Chuck body. The back is bolted to an NMTB50 arbor that has only one 1” wide, full-depth key slot. So what was the purpose, spin workpiece in mill and hold cutter in vise (why?) or what? Did it fit on something other than a mill? Sry no pic, had no phone on me then.
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Purpose of 3-jaw independent Chuck on NMTB50 arbor?
- Thread starter Cannonmn
- Start date
- Replies 7
- Views 1,111
srp61
Aluminum
- Joined
- Sep 19, 2009
- Location
- Dunedin, New Zealand
Possibly for a dividing head, we have a cincinatti dividing head that has a 50 taper socket. have have a 4 jaw attached to a cut down milling holder.
sfriedberg
Diamond
- Joined
- Oct 14, 2010
- Location
- Oregon, USA
Yeah, dividing head or, perhaps more likely, a workhead for a tool&cutter grinder. Many of those had NMTB50 tapers so mills could be sharpened on their arbors.
michiganbuck
Diamond
- Joined
- Jun 28, 2012
- Location
- Mt Clemens, Michigan 48035
On a lathe, a independent 3 jaw be nice for holding hex work, and like a 4jaw if one should not have a 4 jaw.
Good with leaving two jaws in set position and so needing to only pull one jaw.
Agree the arbor likely suggests it may have been a TC, Od grinder (or something) chuck.
With the taper, it could be handy as a tool cutter holder in a mill having that taper..
Good with leaving two jaws in set position and so needing to only pull one jaw.
Agree the arbor likely suggests it may have been a TC, Od grinder (or something) chuck.
With the taper, it could be handy as a tool cutter holder in a mill having that taper..
Thx. Yes it could certainly have been intended for a dividing head. I should have mentioned that the “otherwise” NMTB 50 arbor lacks the “neck” maybe intended to further discourage mounting it on a mill. The single key slot is the first “not for mills” indication. The protruding jaw screw heads wouldn’t be used on a Chuck intended to spin at hundreds of rpm in a mill.
The pix confirm the foregoing regarding dividing head purpose. The broken Cinci divider shown has only one spindle key, and has a big fat arbor, probably 50 taper, but I didn’t have time to pull it to be 1000% sure.
John Morris has shared 4 photos with you! | Flickr
John Morris has shared 4 photos with you! | Flickr
rickseeman
Cast Iron
- Joined
- Oct 7, 2014
My Kearney & Trecker dividing head would like that chuck if you want to sell it.
Thx, I’ll put a note in my “estate sale” file.
Meanwhile my K&T mill has a spline shaft it’d like to connect to a K&T dividing head if you decide to sell that. : c ). I hadn’t thought much about trying to adapt another brand of DH to it, I guess any with shaft connection at same or greater height above table would work, just throw in a big shim of needed thickness,
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