127T change gear for cutting metric threads on a Harrison L5 lathe
thingiverse
The 127T gear is crucial for cutting metric threads on the Harrison L5 lathe, which operates in imperial units. Since 12.7mm exactly equals half an inch, the 127T gear provides an exact conversion. To cover nearly the full range of metric thread pitches, other gears like 40T,50T,60T and 63T are also required. I adapted this from my previous Harrison gear code that utilizes a customiser to allow users to input the number of teeth they desire. It's not recommended to run plastic on plastic, but I've successfully used 3D printed gears against steel gears for an extended period, and they seem to function correctly.
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