Machining Metric Threads on the South Bend lathe -- For Two Dollars??? Part One

How to add metric threading capability to an antique South Bend lathe for a total cost of - Could it really be two dollars? Let's find out. Part 1 of 2. This approach should work on any imperial lathe,. But the ratio for the stud gear and qc gearbox settings will be different. https://gearcalc.thebuildist.com/ contains a calculator to produce the set of gears you'll need to do most metric thread pitches. I've also written an Excel spreadsheet to calculate the stud gear and gearbox settings. It can be found at: http://www.homemadetools.net/forum/me...