Gallery, Projects and General > How do I??

Alternative to backplates

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Darren:
Thanks John,

Can't cut threads on this lathe, that's the whole point.

OK it was worth a thought, small chuck or nothing it is then. Good point about Boxford threads, arn't they square?

bogstandard:
I'd forgotten about that Darren, it is so long ago since we discussed it.

I think then we talked about me making you a new spindle, but you would lose your 5C nose taper.

Boxford threads are standard triangular shaped. 1.1/2" x 8TPI.

Maybe you spindle nose could be modified. Without measuring up, I wouldn't know if it is possible. It is the 5C nose taper that would be the deciding factor.


Otherwise, back to the drawing board.

John

Darren:
John,

It's the 5C that made them change their standard size from 1 3/8" to a 2" thread. To make room for the 5C from their own smaller collets. Shame they didn't up it a tad more to 2 1/4 as there are quite a few other lathes that use this size.

I really don't think you'd be wanting to make one of these, but then again I know you like a challenge  :lol:

bogstandard:
Darren,

I have just been thinking, if you could wait a while, until I am back on my feet, my 5C is ground to be super accurate (no detectablle runout at all). It would be no big job to mount it onto my lathe, and single point cut it to any thread you needed.

All you would need is either a die like you showed, or say a backplate of what you wanted to use. I think pre made boxford backplates are readily available from RDG.

Then you could use that as a basis for a complete range of chucks or faceplates, as long as you weren't doing any super heavy machining, it should work ok.


John

Darren:
Bogsy, you did mean this thing didn't you



Cos here's a description of the spindle

"By 1954 two additional headstocks were being offered, the PRH/1 and LPH. The PRH/1 could mount standard 5C collets and had a nickel-chrome steel spindle, case hardened and ground on
all working surfaces and running in special high-precision anti-friction bearings."


Thanks for the offer, I may just be knocking on your door when you wake up......take care in the meantime  :thumbup:

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