This one ended up with 323 teeth and I calculated 323!
Self indexing was helped by graduations done in the 4 jaw acting as
a rotary table.
Final depth was also as calculated...0.875mm which for an ACME
thread is pitch/ 2 and a 29 degree tool.
I made a video this time of the hob/ worm polish process.
That makes 3 successful gears from this process.
Pic 1: at half depth on the hob
Pic 2: full depth and now polishing on the worm section.
Pic 3 and 4: final product
Steve