I am trying to make a sheave for a wooden block. Something like this, except the sheave is made out of oak, not plastic:
I am cutting the 2" blank out of an oak plank using a hole cutter. The hole cutter makes a pilot hole in dead center. I need to expand this hole to 3/8", but the bigger hole also needs to be dead center for the sheave to turn smoothly on the bronze pin.
I am using a drill press to drill both the blank and the 3/8" hole. After doing several experiments, I can get *close*, but I'm having trouble getting the 3/8" hole perfectly centered.
All I'm doing now is eyeballing the tip of the drill bit over the pilot hole. You'd think this would work, but the result is always a smidgen off centered.
Is there a trick that would help?
Thanks in advance: John