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a 1/2-10LH tap only costs $100 or so at McMaster-Carr. Looks like you saved some bucks doing the internal threading on the lathe.
HiAndyThe thread is actually a square profile the tool was slightly narower than the finished thread once it was cut to depth i slowly widend it untill a good fit was achived.I was talking to rob wilson he sugested making a silver steel tap at the same settings as the screw this would be used to finish the internal thread John
If you made it a bit longer, you could part off the end and make it into a tap exactly matching the leadscrew's threading. Or am I all wet?
Hi,Rdg Tools have them for £8.51, I just gave another bloke from in the US the link the other day, he ordered 2 and cost him $55 US dollars delivered.http://www.rdgtools.co.uk/acatalog/ACME_TAPS__LEFT_HAND_.htmlDave