Outside of the feedscrew running bass ackward, there is little difference in right and left threading. Most everyone here uses a slightly different technique. But for symmetrical threads such as 60 degree "V" and 29 degree ACME, the tooling for left or right is the same. In reality, only when one gets into "butress" threads like old timey railroad jacks does the cutter get non-symetrical. Whether you run forward or backward, tool front or back, above or below, the only real concern is the direction of the feedscrew.
I cut a lot of metric threads, as well as imperial, near half and half. Usually a machine, bicycle, engine, model, whatever, will be one thread form or the other throughout. When I make a modification to that something, I try to stay with the same as existing. With that in mind, I always use the technique for cutting metric threads, where the half nuts are never released. It's a pain in the wazoo, but I'm old and like consistant techniques. Whatever you are comfortable with, that's the best for you.
The only real difference in my technique is that, as a rule I use a HSS cutter for smaller threads. At around 16-18 TPI or a similar metric, things get a little fuzzy. I use whatever is handy. For small threads, I use HSS exclusively, keeping several grades of inserts is an outside problem. For larger threads, which I seldom cut, I just use the same inserts as for roughing, turning a fresh face if needed.
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