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Imperial threads on a metric lathe...

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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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