07-31-2013, 06:55 AM
(07-31-2013, 06:42 AM)Mayhem Wrote: Take a look here ED Marv probably has a calculator programmed up already...
You beat me to it Darren. I just visited that thread and thought I'd post the formula for others to enjoy.
TD = MD - 0.013*DOT/TPI
where:
TD = tap drill diameter
MD = major diameter
DOT = desired depth-of-thread expressed as percentage
Ed