Does anyone know the mat behind creating threading on CNC

I'm curious to calculate the speeds I would need to do threading on
my Sherline mill. In order to do this I am in search for the math
to calculate thread size against spindle RPM and the feed rate
needed. Can anyone explain the relationship in such a way as it
could be used to calculate the feed rates? e.g., a given thread and
spindle RPM would require 'x' feed rate.

Thanks,
Ken