Popular Woodworking 2004-12 № 145, страница 54
Shiplap joint Tongue-and-groove joint ■ Shiplap Joint A useful combination of two of our joints in this chapter is shiplapped boards, which are often used as decorative (and sturdy) backs in cabinetry. The shiplap joint uses two interlocking rabbets (created on the long edges of the boards). The interlocking rabbets form a solid back that still has the ability to expand and contract with changes in humidity, without stressing the cabinet, or opening a gap between the boards. To add a decorative element, bevel the shiplapped boards at the mating edges. ■ Tongue-and-groove Joint A mating of a two-sided rabbet (forming a tongue) and a groove run in the long edge of a board forms the tongue-and-groove joint. Offering the same benefit against wood expansion and contraction as the shiplap joint, the tongue and groove also offers great strength as a mating joint. It allows long boards to stay parallel over long lengths. That's why it's most common application is in flooring to lock the board lengths tight against one another. This joint also plays an important role in frame-and-panel doors, but we'll cover that in more detail in Chapter Six. ■ Rabbet-and-dado Joint With a rabbet on one side and a dado on the other, this joint makes a strong, but simple drawer joint. While a simple rabbet joint can be used as a drawer joint, the addition of a dado allows the rabbet to be firmly captured on three sides. This adds strength and stability to the joint. And this joint isn't only for drawer sides. Many drawer bottoms are slipped into grooves cut in the drawer sides to form an even simpler rabbet and dado. But wait - that makes it a tongue (the entire bottom is a tongue) and groove joint. PW Add Basic Joints to Make Complex Ones A rabbet is a fairly simply (and not all that sturdy) joint. How it's used can make it much stronger. If the tongue of the rabbet fits into a groove or dado, greater strength can be achieved. In fact, one of the strongest joints in woodworking is the mortise-and-tenon joint. And a mortise is nothing more than a groove with closed ends, while a tenon is a double rabbet! To turn a rabbet into a tenon, you're simply cutting a shallow rabbet on both sides of a board with a dado stack that's wider than the dado cutter itself. Do this by making two or more passes. This seems simple enough if you have to make only one joint - make the first pass, move the rip fence or reposition the board on the miter gauge, make the next pass. But if you must make several precise copies of the same joint, use spacers to help position the boards, removing them one at a time as you make each pass. Rabbet-and-dado joint popwood.com 101 |
