Popular Woodworking 2004-08 № 142, страница 44
TIPS & TRICKS GREAT TRICK: Use a Push Block When Routing Smaller Pieces When cutting small pieces on a router table, be careful to keep your hands and fingers clear of the bit. You may wish to secure the stock to a push block or a large scrap with double-faced carpet tape to rout it safely. PRO TIP: Use Bearings to Get Perfect Fence Alignment When setting up a bearing-guided bit in a router table during an operation that uses the fences, the bearing isn't a necessary part of the procedure, but it's still useful to help you set the fence. After adjusting the proper height of the bit for your cut, use a straightedge held against the bit's bearing to align the fences perfectly. In fact, if you don't align the fences correctly, the bearing can protrude past the fence faces, causing your work to ride away from the bit in the middle of your cut. Rule Joint A rule joint is not so much a joint as it is two decorated, mated edges between a tabletop and a drop leaf. Cut a bead and a fillet in the tabletop, then cut a matching step and cove in the drop leaf. When the table is assembled, the bead will show when the leaf is down. When it's up, the joint will close and the surfaces will be flush. The trick to making a rule joint is not as much in shaping the edges as it is in installing the drop-leaf hinges. Each hinge must be mortised into the wood so that its pin is at the center of the arc described by the mating cove and bead. Just fasten the long leaf of the hinge to the drop leaf, then fasten the short leaf to the tabletop and you're done. You can rout a rule joint using a simple cove bit. The bit height should leave a flat to match the mating profile's bead. When both rule joint profiles are correct, the pieces should nest together with the top surfaces flush and a very small gap between the profiles.
1/16 1/16 Vis" fiat 1/16" fVn" gap Top detail 1/i6"flat V/2" 15/32" 5/32" 1/2" 1/i6"flat V/2" 5/32" 1/2"
5/32" fiat Drop-leaf detail Vi6" mortise typical Hinge detail 3/32" A great application for the rule joint is to install drop-leaf table hinges. You just need to make sure you think before you act. What seems normal - just placing the hinge barrel where the leaf and top meet, like a door to a stile - is totally wrong. Also, you need to make sure that you don't make the hinges flush with the underside surface. You need a bit of depth there. As with all hinges, the location of the pivot point is the ultimate concern. With the drop-leaf hinge, the pivot point (the center of the pin) must be centered on the radius of the matching profiles. Popular Woodworking |
