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So I then swapped the bar around to cut the M10 thread on the other end, and that's when the fun started. I can't screwcut metric threads without fitting the metric conversion set, which takes longer than I wanted to spend on it.
AS,I find die cutting any thread above 1/4" / 6mm in steel a pain so I do tend to single point cut most threads and just finish with a die. Which is where this table comes in handy:Just slip the 24 tooth gear below the tumbler gears off and replace with either a 33 or 34 (available from Myford). Pitch accuracy is good enough for almost all purposes.HTHRod
Rod there is an error on the M fine threads the second calculation with 12 using the 33 stud gear and 20 box gear. It should be 1.746 value.For any one interested I have attached a Myford gear box calculator. It will calculate TPI and Metric threads along with gear box ratios up to three gears sets along with the Norton QC gear box.
The die (not a die-nut - that was the whit one) is one from a cheap set I bought somewhere over the years, so it could be that.