Help identifying lathe tool!

[MacGregor]

Hello!

I wonder if anyone can help me identify a part which came with an ex school Wadkin BL wood lathe I bought.
It is made from heavy bronze, is hollow, threaded to accept the 1.5" 6tpi right hand thread of the inbound side and has a very fine but rough finished internal thread on the tailstock end of the tool. It could be a kind of a collet made especially for a specific educational task but why bronze? Maybe to extract as much money as possible from supplying schools!

Please see attached photos.

I'm sure the answer will be straightforward but I'd love to know. Thanks for any input!

 

[wizard]

Some sort of tool holder it could be brass and bronze is not very expensive

 

[parvum]

Hi its a jam chuck, the threaded end goes on the spindle and the other rough internal end accepts the end of a piece of wood for spindle turning, the other end is supported by the tail stock,you may find some screw threaded holes around the unthreaded opening to accept grub screws, thus giving a more positive grip than just friction provided by the rough finished slightly tapered opening, although this should not usually be necessary. Great lathe and bullet proof, I've rebuilt one and made it three phase with variable speed, like working on a tank!

 

[heimlaga]

I agree. It looks like a jam chuck to me.

Maybe someone had a piece of bronze laying around and used it because it is much easier to turn non-standard internal threads in bronze than in mild steel.

 

[MacGregor]

Thanks for the replies! Yes I'm concluding it's a simple chuck. Makes a good paperweight! Yes it's a solid machine for sure, though the spindle thread size is a bit of a pain but I shouldn't be needing more faceplates for a while. A chuck would be handy though!
Cheers!

 

[bugbear]

I agree. It looks like a jam chuck to me.

Maybe someone had a piece of bronze laying around and used it because it is much easier to turn non-standard internal threads in bronze than in mild steel.

In a school workshop context, it's quite likely they had the requisite metalwork lathe - my school had a Union Graduate and a Myford super 7, amongst other things.

BugBear

 

[Vic Perrin]

I think it's an attachment for a morticing tool as used on the Coronet Lathes

Vic

 

[parvum]

Hello again MacGregor, These chucks were supplied as original equipment with the new lathe , see Tony's web site lathes.co.uk for info. Graduate lathes have the same 1 1/2 x 6 thread form so chucks ,chuck adaptors are readily available. I got my stuff from Sorby.

 

[MacGregor]

Thanks folks, good info!

 

[Vic Perrin]

Here's a picture of the part in use holding a morticing tool