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Headstock spindle (Turnstyler Slide Bed Lathe)

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RLSK:
Hi,
I own a Turnstyler Slide Bed Lathe and it has an unusual headstock spindle, it has no thread and has a hole right through the headstock to accommodate a threaded bar which can be attached to faceplates and a Oneway Stronghold chuck which has been modified in someway.
I have this idea that I could have a threaded spindle made which could fit onto the existing headstock spindle, it would need to be approx 100mm diameter with a circular recess with locating pin and threaded hole to take the threaded bar and obviously the threaded spindle that will hold modern chucks, etc.
My question is, what would be the best thread to use? How long should the threaded part be? Length of register beyond the thread?, etc.
I have tried to find these details on some larger lathes out there but can't find anything.
Kind regards
Rob

fuzzyturns:
I personally would go for a M33 thread, as most new kit will be made to fit onto that (or at least have an option for this). I believe the M33 mounting is actually standardized, and you should be able to dig up some spec on the internet. If not, let me know and I'd be happy to provide you with a diagram showing all relevant dimensions from my own lathe.

RLSK:
Thanks fuzzyturns
Yes I was thinking m33 but I spent a few hours yesterday trying to find all the dimensions I would need to give to someone for making it also what type of metal should be used?
Kind regards
Rob

fuzzyturns:
I can get you the dimensions of my headstock this evening. Since this is not an engineering lathe, you don't need any specialist steel, standard tool steel should be fine. If you can afford the cost of stainless steel, that's better, but it will also take longer to machine (it's tough stuff).
I can't easily identify a suitable source for an official standard right now either, so the drawing from my lathe is the best I can do.

The Bowler Hatted Turner:
Not sure if stainless steel would be the material to use. It has a tendancy to bind on the threads.

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