Perfect Profiles on the Router Table
Shims are the secret to clean, accurate profiles and joinery cuts
Alan Turner knows the secret to cutting perfect profiles on the router table. Set the fence and/or stop block just once, and then use precisely sized wood blocks to make subsequent cuts in other positions. It works great for joinery, especially when doing a number of identical parts. In this case, your ultimate goal is just one good cut—a clean, precise profile on the router table—and instead of blocks, you use shims.
From Fine Woodworking #228