Popular Woodworking 2007-08 № 163, страница 10
Tricks of the Trade THE WINNER: Dual-purpose Router Trammel recently needed to make a round tabletop, so I built a trammel to suit my router. I wanted the trammel to be long enough to rout large-diameter circles and be stiff enough to also serve as a steadying extension when routing the edges of narrow pieces. (For example, when routing a narrow frame, the extension rides on the opposite frame member to keep the router level.) I also wanted to be able to connect and disconnect it quickly. This trammel serves all three purposes nicely. The unit consists of a plywood extension arm and a solid-wood connection block that attaches to the router with a couple long bolts that slide into the router's edge-guide attachment holes. I drilled the bolt holes into the block using the drill press for accuracy, threaded the bolts into the holes, then hacksawed off their heads, leaving an unthreaded section to insert into the router. (Alternatively, you could epoxy appropriately sized metal rods into the holes.) I positioned the holes so that the bottom face of the block aligned with the bottom of the router base, then sawed a lap joint in the underside of the block to attach the plywood arm. I routed a long, stepped slot into the arm to accept an adjustable pivot pin with a female wing knob, a T-slot nut (both available from Lee Valley; 800-871-8158), and a VV'-diameter bolt with a partially unthreaded shank. I threaded the bolt as far as it would go into the T-slot nut, then cut off the bolt head to leave about V4" of unthreaded shank to serve as a pivot pin. Threading a knob onto the other end creates an infinitely adjustable pivot point that can be inserted into a VV'-diameter hole drilled into a hidden face of the workpiece. — Gary Dean, Prince George, British Columbia Washer Knob Extension arm Size bolts or rods to extend into router's edge-guide connectors Connection block \ T-slot nut Headless bolt Female wing knob Plywood extension arm Rout stepped slot to accept bolt and T-slot nut Make underside of block flush with router base T-slot nut Unthreaded section of beheaded bolt serves as pivot joint Cash and prizes for your tricks and tips! Each issue we publish useful wood working tips from our readers. Next issue's winner receives a $250 gift certificate from Lee Valley Tools, good for any item in the catalog or on the web site (leevalley.com). (The tools pictured at right are for illustration only, and are not part of the prize.) Runners-up each receive a check for $50 to $100. When submitting a trick (either by mail or e-mail) you must include your complete mailing address and a daytime phone number. If your trick is selected for publication, an editor will need to contact you. All entries become the property :.■..'-'., X ^ .' of Popular Woodworking. You " —can send your trick by e-mail to popwoodtricks@fwpubs.com, or mail it to Tricks of the Trade, Popular Woodworking, 4700 E. Galbraith Road, Cincinnati, OH 45236. 16 ■ Popular Woodworking August 2007 TRICKS COMPILED BY PAUL ANTHONY; ILLUSTRATIONS BY MATT BANTLY |
