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Chuck backplate with 1" 8tpi thread?

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edward:
Axminster stock a suitable thread backplate for a now obsolete wood lathe chuck. Got one on the way now, hopefully it will fit but if not I can return it. The Drummond may yet rise again!

BaronJ:

--- Quote from: John Stevenson on March 11, 2015, 07:49:42 AM ---Early Myford, ML1 TO ML4 were 1" x 8 tpi to the best of my knowledge, as was the ML8 wood working lathe

--- End quote ---

I believe my ML8 wood lathe is 1" X 12 tpi.  Though I must admit never checked it.

edward:

--- Quote from: Baron on March 11, 2015, 01:12:08 PM ---
--- Quote from: John Stevenson on March 11, 2015, 07:49:42 AM ---Early Myford, ML1 TO ML4 were 1" x 8 tpi to the best of my knowledge, as was the ML8 wood working lathe

--- End quote ---

I believe my ML8 wood lathe is 1" X 12 tpi.  Though I must admit never checked it.

--- End quote ---

Consensus seems to be the thread should be 1" 12 on this mark of lathe, along with the M type and early Myfords and the ML8  wood lathe. I have spoken to RDG and Myford and they all have backplates like that, but not 8tpi. Apparently there are wood lathes out there with 8tpi noses, and thankfully Axminster have a plate that might fit for their now obsolete 'precision' wood lathe chuck which I might be able to adapt.

If not then time for a bespoke plate, but that is slightly complicated to do on the actual lathe.

I think that the spindle may have been changed at some point. Another little thing sent to try me.

Oh well, onwards and upwards!

edward:
time to bang head against wall! The axminster plate is UNC and my nose is Whitworth. It will go on nearly two turns then locks up.  Poo.

Time for a re-think.

edward:
need to check if this is an insane idea. If I were to run a whitworth tap through the UNC thread would that re-cut the 60° angle to 55°? They are both 8tpi and It should be taking material away.

Or is this mad and there is some awful disaster I am missing?  I am probably going to need atap anyway

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