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Bob,
thanks for sharing your results.
The Acme thread certainly looks far more suitable in shape to my
results with plain metric.
One thing though, looks like you have a big distance out from the chuck
and live centre.
You only really want to have just enough or the hobber will flex away
from cutting as you apply cross travel. I noticed this happens on mine
and it will take ages for the new cut to actually develop a deeper
thread. I use 2 thou cuts and after about 10 revolutions and cutting
compound it seems to be ready to add another 2 thou etc etc.
Was the jack thread hardened? I'm going to try turning up my first
M12 x 1.75 or M16 x 2 ACME thread soon.
Steve
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