gear and belt sources

Howdy,
I am looking for a source for parts for gears and belts, from the
servos to the controls. say a 2x1 ratio.

I am certain I mis-stated this, but I think you know what I mean.

Got the frejoth lathe F1 in last night, in place. next to zero
runout, and I'll be using the acme threads for the kickoff portions

thanks in advance
jeffe