3.Finger joints lend a helping hand
Ever wish you had a board stretcher? This technique joins boards end to end, without buying a specialized bit. It also works great on box corners. Build the jig shown below, and set it up as shown in Photos A–E. Note: The width of the project material should be an even increment of 1∕8" so the faces align when you assemble the finger joint.
Glue and screw the base, brace, and upright together. The key is added later. The support gets repositioned, so don’t glue it. Be sure the support has been machined square, or your project pieces won’t fit correctly.
Install a 1∕8" straight bit and set its height to 1∕4". Position the fence 17∕8" from the center of the bit and make a 1∕2"-long cut into the jig.
Make a 1"-long hardwood key to fit the groove, and glue it in place.