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Hi all.
Not sure if this is the correct place for this thread but here go s.
Has anyone got a lathe with a 4TPI lead screw , as i have just got hold of one and need some info on screw cutting on it.??
Thanks in addvance.
Chubbs
What i am after derek is a Indicator table to suit this lathe so i know were to drop in for repeat cuts.There are 6 positions marked on the dial plus the half ones , the gear on the dial indicator has 24 teeth.I am used to a lathe with an 8TPI lead screw but it has a 4 position plus half ones , i do have a indicator chart for this lathe but i dont think it will be the same would it?????? appreciate any help.Not trying to be sarcastic but you're being more than a little vague. Yes, I have a lathe with a 4TPI lead screw, but I don't think that's really the question you need answered????
4 TPI on the screw, so every 4 teeth of the gear corresponds to one inch of relative movement between the carriage and the screw. 24 teeth on the gear means 6" of movement per rev of the dial, hence the six divisions you see on it. Each large division is one inch of travel, each small division is 1/2" of travel.
So, it works out that you can pick up:
ANY WHOLE number thread on any Large division(1" mark).
ANY EVEN number thread on any small division(1/2" mark)
4 or any multiple of 4TPI threads, ANYWHERE, on any large division, small division, or half way between small divisions.
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