Stabilize Workpieces While Trimming Plywood Edging
After I've added solid wood edges to plywood and need to trim them, I use a router with a flush-trim bit. To keep the router from wobbling on the 3⁄4 " edge or to avoid building and storing a jig to balance the router, I simply do two or more at a time.
As illustrated above, I clamp the plywood pieces onto my tablesaw fence with a spacer piece of scrapwood between each pair. This way, the router sits on at least 21⁄4 " of edge. To stabilize wider pieces, I clamp an additional spacer near the top. If the plywood is too large to clamp securely to the fence, I clamp it directly to the table and work sideways.
—Karl Siefert, Philadelphia, Pa.