1.75″. Chuck backplate.

1.75″. Chuck backplate.

This topic has 4 replies, 4 voices, and was last updated 13 November 2019 at 19:33 by old mart.

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12 November 2019 at 23:10 #437051
Peter Newton 3
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@peternewton3
Hello. I'm a new member and am at present attempting the restoration of a Ragan Little John lathe. A 6" chuck came with the lathe – with the wrong backplate, which has a 1.75" 'V' form thread and not the square (6 tpi) the Raglan needs. Someone mentioned a member on the forum enquiring about a backplate (1.75" diam with BSF form?). Does anyone know of the member?

regards. Peter Newton
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12 November 2019 at 23:10 #40656
Peter Newton 3
Participant
@peternewton3
13 November 2019 at 09:12 #437068
not done it yet
Participant
@notdoneityet
I very much doubt that a lathe with 6tpi Whitworth or Unified thread would have the same register dimensions. Possible, I suppose, if you are looking to sell. Check out the wanted section on the forum.

Bore out and sleeve it, if there is sufficient metal to do so. Then recut with a square thread.

I see second hand Raglan back plates selling for around £60 delivered, on epay. They are easy enough to make – and one would be confident there is sufficient metal to safely cut another spigot.

There are threads, for making spindle nose protectors, on :

**LINK**
13 November 2019 at 12:34 #437090
Pete Rimmer
Participant
@peterimmer30576
If you want to make a Raglan backplate/faceplate by re-purposing one from another lathe you'll need to find on with a sufficiently wide boss yet an existing thread of 1.5" or less to allow enough material to cut the 6tpi square thread.

A Boxford one would suffice, if the rear boss is wide enough to accommodate the Raglan thread.
13 November 2019 at 19:33 #437149
old mart
Participant
@oldmart
Smart & Brown use a 1 3/4" X 8 W spindle thread, with a 1 3/4" diameter register.
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