Woodworker's Journal 1985-9-3, страница 50

Miter Clamping Jig

Every woodworker knows the importance of clamps; it seems that one never has enough. Given the expense of commercial clamps, shop-built clamps are a popular item with most woodworkers. This easy-to-make miter clamp is useful with virtually any project calling for mitered frames. From mitered frame-and-panel construction to picture framing, the adjustable corners accommodate a wide range of frame sizes. The wing nuts facilitate easy knockdown and changeover capability without the need for any tools. Firm, even pressure is applied at all four corners through a hand screw positioned across the two center cleats as shown. For small and odd-sized frames, simply switch the four corner pieces to the opposite side of the clamp where the center cleat will not interfere with the clamp-up.

To build the damp, first cut four lengths of V* in. hardwood stock, 1 Vi in. wide by 16 in. long. Next cut two shorter sections of the same stock, 1 Vi in. wide by 4'/a in. long. The four corner pieces are cut from V* in. plywood to the specified dimensions, and a Vi in. hole is drilled at each inside point where the miters will meet. Finally, drill the 5/16 in. diameter holes through all the pieces to accept the Vi-20. 2 in. long bolts. You will need a total of eight each of the bolts, washers, and wing nuts. Soften all edges with sandpaper and wipe on several coats of penetrating oil. When using the clamp, wax the corners to prevent glue stick during glue-up.

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