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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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