Emco chuck on Watchmakers lathe

[Speedy Builder5Participant @speedybuilder5]

I want to fit a 2" Emco 3 jaw chuck to my watchmakers lathe (Unknown make).

So I need an 8mm collet with a front end threaded 1/2" BSF to fit the Emco chuck. Anyone know what it is called or where I could look for one.

I have the dimensions of the lathe collet and a list of collet tales from the 'Lathes' site.

[Speedy Builder5Participant @speedybuilder5]

Searching for collet mandrel

[JasonBModerator @jasonb]

"8mm Screwed Arbor" should find you something. I know RDG do M14 x 1 for which is the Emco Unimat 3 thread and may also do M12x1 for the SL but surprised the Emco chuck you have is BSF

Alternative would be an 8mm blank arbor and thread it yourself which any registers etc.

Edited By JasonB on 09/03/2020 19:16:04

[Speedy Builder5Participant @speedybuilder5]

Belated thanks Jason, not found one yet but … At least I have a name for the 'Arbour'. A 1/2 " BFS tap enters the chuck nicely, but I suppose it could be 12mm x 1.5 – will check that out tomorrow.

Bob

[HollowpointParticipant @hollowpoint]

Posted by Speedy Builder5 on 10/03/2020 21:23:09:

Belated thanks Jason, not found one yet but … At least I have a name for the 'Arbour'. A 1/2 " BFS tap enters the chuck nicely, but I suppose it could be 12mm x 1.5 – will check that out tomorrow.

Bob

Emco chucks are M12x1 unless someone has made a different backplate for it. 1/2 inch bsf is very close but the thread angle is different (55° rather than 60°.) 

Edited By Hollowpoint on 10/03/2020 23:27:34

Edited By Hollowpoint on 10/03/2020 23:28:04

[Speedy Builder5Participant @speedybuilder5]

Update – On closer inspection, there is a thread adaptor (Backplate). The thread in the chuck is 5/8" x 11TPI 55 degree form – Whit ? I guess there won't be many arbors like that around.

Its definitely not metric form

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