How to Make a Router Circle Cutting Jig

Step 4 Drill the Holes

Drill holes for the mounting screws, making them just a little bigger than the diameter of your screws.  I ended up using a 1/4" bit.  Flip the base over, and using the holes as a guide, trace the baseplate on this side too.  Choose which side you want to moun the router on, and chamfer the mounting holes on the opposite side.  You want the chamfers just deep enough that the screws will sit beneath the surace.

Drill or rout out the center hole.  It just has to be slightly bigger than the largest router bit you might use.  A hole saw is probably best for larger holes, but I used a twist bit, and it caught and made a pretty messy hole.  It won't really effect anything other than aesthetics, but next time I'll take the time to get the correct bit out.  I did clean up the hole a little with the router later.