Gallery, Projects and General > How do I??

metal lathe thread dial

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bert4255:
I would like to make a thread dial for my lathe. it is a large lathe has a 49" swing, nt that that matters. How do i determine how many teeth the thread dial needs in relation to the lead screw. Is there a ratio? I want to do imperial threads.

RussellT:
I think we need more information.  Is the lead screw metric or imperial.  What's the thread pitch?

Russell

bert4255:
I think the lead screw is imperial. I'm not sure on pitch. I'll try and find out. thanks

John Stevenson:
The gear has to be a multiple of the threads per inch.
Just guessing from the size but your lathe probably has a 4 tpi thread so the gear needs to be a minimum of 8 or better 16 teeth

bert4255:
Thanks John, I will check and see what the thread count is

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