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You can fuss with rulers and depth gauges all you want, but here are two quick and easy ways to precisely set your plunge router cutting depth.The method shown on the left uses different drill bit thicknesses to exactly set a router's plunge depth. First, place the router on your bench and plunge the bit until it touches the benchtop. Then lock it in place. Loosen the depth stop-rod, and sandwich a drill bit of a diameter equal to the plunge depth between the turret stop and rod. Then tighten the rod in place. Unlock the plunge mechanism, and you're ready to plunge into your project.The method at below left uses spacers planed to the same thickness as the depth of your plunge cuts. Place the router on a pair of spacers, and plunge the bit until it touches the benchtop. Then lower and tighten the stop-rod.