Posted by BillS on August 07, 2015 at 10:09:10:

In Reply to: Re: Lead Gear posted by inshaajee on August 06, 2015 at 13:47:09:

I think you just want the formula for gear lead?

Gear lead = [PI x Teeth] / [NDP x Sin(HA)]

I originally thought you didn't have the differential formula and were looking for a way to calculate HA from a known setup:

Sin(HA) = differential ratio / [.101614 x NDP ]

The formula above is true for single start cutter.

Is this what you need to know?