Using a self centering dowel jig
I bought one of those "self centering dowel jigs".
The jig has two holes, 3/4" apart for drill guide bushings. It comes with
two bushings each for 3/8", 5/16", and 1/4" drills. The jig also has two more
holes without bushings, one for a 1/2" drill, the other for a 7/16" drill.
You can find this jig by searching for "Self centering dowel jig" on Lee Valley Tools,
Rockler, Woodcraft, or Amazon.
I have always been skeptical about guiding a drill by turning it inside
a metal guide bushing. But all the drilling jigs out there seem to rely on
this sort of technique, so I guess it's durable enough. I have only used this
jig fora few projects, so I can't say how long it will last. I periodically put a
drop of oil in the holes, in the hope that it will help lubricate the drill
and slow down wear.
I have used the dowel jig for several projects, just click on the links below.