metric threading chart

how do i aquire a metric threading chart for a 17" southbend turnado?
Reply to
Dwain Martinson
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"Dwain Martinson"
I made a threading chart for my 10" SB that lacked the plate by writing a spreadsheet which included the tumbler and banjo gear ratios in the formulas. As I didn't know the gearbox innards I reverse engineered the pitches from a photo of the gearbox plate.
I found that a 120/127 metric gear set would add more fine threads for the optical stuff I was making than the standard 100/127 set.
-jsw
Reply to
Jim Wilkins

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