Woodworker's Journal’s editor in chief, Rob Johnstone, likes to keep moving in the shop. Rather than take the time to pull out a tape measure (an awkward and questionable way to set depth with a handheld router or a router table), he uses a shop-made jig instead. “It’s just a block of wood with a series of holes carefully drilled to predetermined depths,” he says. (His includes commonly used depths for dadoes or grooves: 1/8", 1/4", 3/8" and 1/2".) The holes are at least 1" in diameter, bored using a Forstner bit Router chucked in a drill press. On the edges of the block of wood, additional depth-setting rabbets are cut — again to accommodate commonly used measurements. These are used to set up cuts on a router table.
Note that the rabbets have a predetermined depth and width. This allows you to set up for rabbeting using a straight bit. Hold the block against the fence to set the width of the rabbet cut. “You still should make a test cut in scrap before moving to your actual project,” Rob adds. “That’s a precaution you will never regret.”