Under most circumstances a mitered box can be successfully glued and clamped using rubber bands or plastic packaging tape to pull the corners tight. But there are times when extra clamping pressure is required. Two sets of these clamps is the perfect solution. You can buy more expensive miter clamps from a variety of sources, but these are less expensive and more satisfying, because you made them yourself. Start by cutting the blocks to length, and then use a Forstner bit to counterbore the shorter blocks for the hex nuts. Now drill through all the blocks for the long threaded rods. Use epoxy to fix the hex nuts in the counterbores and let the glue dry before gluing the short blocks to the long ones with 1⁄8-in. birch plywood as shown. The 1⁄4-in. threaded rod is available at most hardware stores. Use a hacksaw to cut it to length, and gently grind or file a chamfer on the ends so they thread easily into the nuts and knobs. I cut the rods roughly 12 in. long, and use threaded coupler nuts to join rods for extra length. The plastic knobs are available online for about $1 apiece. Get the kind…
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Mr. Stowe thank you again! Great Project for some of the left over wood I (we) seem to hoard for too long.
I agree with user-6284072 that the lines are missing in the drawing that separate the nut block from the slide block.
The assembly could use a double nut or epoxy to lock the nut in place. Make sure the nut end butts at a right angle to the slide block and is attached by the side strips.
Optional spacers would make these work for box joints where you don't want clamping pressure directly on the corner.
These drawings are incorrect and missing some important steps. The drawing shows holes drilled through the length in the center of both blocks. However, the black and white drawing shows the threaded rod passing through the width of the longer block then through the nut and the length of the shorter block. And how does the knob tighten the clamp? The threaded rod passes through the knob. Is the knob epoxied to the rod so the rod turns? Something is missing in the instructions.
There is nothing at all wrong with either the design of the clamping blocks or the drawings. I will be making a set of these.
The Iso black & white drawing could have had vertical line drawn on the blocks of wood joined by the side pieces. This would have shown the piece orientation better, imho.
I think the illustration has a problem with a couple of its vertical lines.
Is this illustration correct? It doesn't seem to work as described and drawn.