flexispeed lathe/chuck problem

[Swarf, Mostly!Participant @swarfmostly]

Hi there, all,

My apologies for being a bit late to the party.

I just thought it might help to mention that the old Imperial electrical conduit threads were 16 tpi (Whitworth form), certaily for the ¾" and 1" sizes – I'm not sure if that's also true for ½". Conduit threads were 'borrowed' by some machine builders, e.g. my Coronet Minor woodworker mandrel was ¾" conduit thread.

And I seem to remember that British Brass thread was 16 tpi while some (Imperial) cycle threads are also 16 tpi though one or both might not be Whitworth form.

Best regards,

Swarf, Mostly!

[Howard LewisParticipant @howardlewis46836]

Just to clarify:

BSBrass is Whit form, (55 degree ) usually 26 tpi, where Cycle thread is also 26 tpi but 60 degree form.

But how are things progressing on sorting out the Die cut thread in comparison to the Thread on the mandrel of the lathe?

Any checks on core diameter of the Die, for instance?

Howard

[jason shawParticipant @jasonshaw24246]

thanks Howard and Swarf, and a happy new year to everyone

Update and a resolution.

It turns out that the 2 inch split die does in fact open to a point of giving a PERFECT THREAD MATCH.

I do however feel slightly vindicated as i took it to a mechanic close by and it turns out that the setting/splitting screws in the cheap die holder were deforming and the heads were starting to strip out before the die could open enough. Once he replaced them with some propper bolts the die worked great…. note to self be careful of cheap equipment…

you guys have been so helpful and i've picked up more from your replies than just an answer to this specific issue

THANK YOU ALL

Jason

[Michael GilliganParticipant @michaelgilligan61133]

Excellent result, Jason … Thanks for letting us know

MichaelG.

[Howard LewisParticipant @howardlewis46836]

That makes a good start to the New Year. Now things can only get better.

Thanks for telling us that you have solved the problem., and how.

Howard

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