I got interupted. Doesn't matter in theory or practice, but a 1/4-20 has 20
full revolutions to an inch. Just make the sprocket bigger than the base of
the router. Have to calc throws of everything on paper first. Anyways it
works finely. A flat router top free of dials, etc. helps too, but....

1 complete revolution is 1/20 of an inch, or .050";

360 degrees / 50 = ; 7.2 degrees of revolution per .001".

1 o'clock is 1/12 of 360, or 30 degrees, or 1/12 of .050", which is .0042"

IOW, a quarter turn (3 o'clock) is .0125" exactly, not to be confused with
1/8" (.125")



Now to go check if mine is 3/16, 1/4, or 5/16...



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