What is the best way to achieve a 45-degree chamfer using a router bit with a 1/4 inch shank?

To achieve a 45-degree chamfer using a router bit with a 1/4 inch shank, adjust the router's base to a 45-degree angle and set the bit to the desired depth. Carefully guide the router along the edge of the material to create the chamfer. Be sure to wear appropriate safety gear and practice proper technique for best results.