Harrison m400 lathe metric thread3/29/2024 ![]() If the leadscrew is geared to run at the same speed as the spindle, then you get a 16tpi thread. This means that for every 16 turns of the leadscrew, the saddle advances an inch. Many versions of the mini-lathe come as standard with a 16tpi imperial leadscrew, including the one I have. The essential principle is that the leadscrew is geared to the main drive spindle at a much higher ratio than is ordinarily used for power feed, and the ratio is chosen so that the cutting tool moves the right distance to cut a single turn of thread for each turn of the main spindle. There’s a basic thread cutting guide in the Clarke C元00M user manual. There’s plenty of detailed information online about the way to cut threads on a lathe, which I’ll not repeat here – a quick search will get you any number of guides and multiple youtube videos of the process in action.
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