Technically Most Easy Box Joint Clamping Jig
Clamp
These clamping jigs are easy to make and you’ll use them constantly and technically it will be easier to operate. I’ve found that 4-inch and 6-inch jigs fill most of my needs.
Each jig consists of two L-shaped 3/4-inch MDF pieces sandwiched between a pair of metal corner mending plates (Stanley). Make sure that the MDF is slightly recessed from the long outer edges of the mending plates. Drill 1/4-inch holes through the “sandwich” on both legs for 2-1/2-inch machine bolts. Use lock washers and hexnuts to hold the sandwich together. Drill a 5/16-inch hole through each leg of the assembly about 3 inches from the corner. Insert the pin end of a Bessey TK6 fence clamp in each 5/16-inch hole, with the adjustment end of the clamp facing outward, and your clamping jig is ready to use.
Use a pair of jigs to hold box corners together for gluing and fastening. The jigs fold nicely to hang on your shop wall.
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