how can i figure the tpi of a lead screw?

[ljoe1969]

hi

i got a lead screw off of ebay. it takes two revolutions to move the nut one inch and it has four starts.

what do i need to put in turbocnc when it asks me for the tpi during set up?

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[bb99]

Good question! I'd guess 2.

For reference:
Lead = Pitch x Starts

Lead = distance the nut moves in one turn
Pitch = distance between the threads

So for you...

1/2" = 1/8" x 4

--bb99