BJWTech
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From Right to Left: The Leland universal jaws, main chuck shell, jaw retainer, octagonal outer chuck shell.
Octagonal Shell. I am pretty sure that the race down there is for ball bearings. The hole is for the screw to pass through to the main shell.
The octagonal shell and the jaw retainer. Both have races for the bearings.
The jaw retainer with a better pic of the race for the bearings.
chrisclarins
For the clueless what this all means:
https://youtu.be/2S3oMWz4__k?feature=shared
BJWTech
The one in this video uses a different mechanism for the bearings. But it is similar.
Snufflegrumpagus
I'm amazed when I think about all the things that were built using tools like this.
BJWTech
Indeed. Nearly a century old. Hopefully it'll be around for another one. :)
IceWeaselX
Now think about how the tools themselves were made back then.
Snufflegrumpagus
All the way back to the Whitworth precision surfaces.
BJWTech
I am trying to locate the retaining screw and the bearings. If you happen to have the specs, please let me know!
Snufflegrumpagus
Could you subtract the O.D. of the jaw retainer from the I.D. of the octagonal shell to at least get you in the ballpark for bearing size?
BJWTech
The bearings don't go in between the shells. They are on the bottom outside race on the retainer and inside top race of the octagonal shell. They are threaded to the spot where the screw hole in the octagonal shell lines up with the threaded hole in the main shell.
Snufflegrumpagus
The bearings sit in the race of the octagonal shell with the matching race of the jaw retainer capturing them. The main shell then threads into the octagonal shell capturing the jaw retainer. The matching holes in each shell are for a screw to hold it all in place so it doesn't either come unscrewed and dump the bearings or screw in more and cause contact between the back side of the jaw retainer and the main shell. Do I have that right? I'd just size them a bit under the width of the race.
BJWTech
You have it right. And have explained it better than I. :)
BJWTech
So I broke out the calipers. It seems to be a #2 screw and a 1.5mm bearing. Wish me luck!