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Imperial threads on a metric lathe...
John Hill:
Stew, a counter would be really easy, figuring out where I went wrong is more difficult! :scratch:
It appears that 127 turns of the metric leadscrew is the right point to drop in the half nuts when cutting imperial threads on a metric machine using the 120/127 compound gears.
All you need is a thread indicator of about 5 inch diameter!
Tinker:
--- Quote from: John Hill on August 24, 2009, 10:24:22 PM ---Tinker, do you know the feed screw pitch?
--- End quote ---
I woke him up & asked...he says 8...
Then I read the rest of the posts...
hhhmmm...
:scratch: :scratch: :scratch: :doh:
John Hill:
Tinker, 8 turns to the inch, not much different to the 3mm metric feeds then..
Cutting inches on a metric lathe seem to be a whole different kettle of fish compared to cutting metric on an inch lathe. All inch whole-number inch threads will divide perfectly into 127 turns of the metric lead screw, which is 15 inches or 381mm.
But I am still trying to figure out the other way! :scratch:
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