furniture design. 55. Common. Woodworking. Joints. 60. General. Rules. for. Joinery. Design. 62. Standard. Furniture. Dimensions. 69. Understanding. To prevent accidents, keep safety in mind while you work. Use the safety guards installed on power equipment; they are for your protection. When working on power equipment, keep fingers away from saw blades, wear safety goggles to prevent injuries from flying wood chips and sawdust, wear ear protectors, and consider installing a dust vacuum to …

15 WOODWORKING MATH Basic Geometry for Woodworkers An understanding of basic geometry is very useful to woodworkers. Indeed, when you consider that every woodworking project is made from parts that form straight lines, curved lines or a combination of the two, it is clear that geometry is very much a part of the workshop. An Gles The space between two lines that meet is called an angle. An angle is usually measured in degrees. Right Angle The angle formed by a line perpendicular to another line. A right angle measures 90°. Acute Angle An angle measuring less than a right angle. Obtuse Angle An angle larger than a right angle, but less than 180°…. 54 CHAPTER ONE chapter two design furniture … 60 General Rules for Joinery Design A number of general rules, or rules of thumb, apply to the design of woodworking joints. Although they work just fine for most applications, keep in mind that these rules are not absolute, so there will be occasional exceptions. Mo Rtise-anD-tenon Joints • When the mating parts are the same thickness, make the tenon about one-third the stock thickness. • When cutting a blind mortise and tenon, make the mortise 1? 16 ” to 1? 8 ” deeper than the tenon length. The added space provides room for any excess glue to collect, allowing the joint to fully close when clamp pressure is applied. Dovetails • The dovetail angle affects both strength and appearance. Avoid a dovetail angle of less than 7° because the resulting joint offers minimal locking strength. Also, avoid a dovetail angle that’s more than 14° as the resulting short-grain edges are more likely to shear off if the joint is heavily stressed. Any angle between 9° and 11° offers good strength and appearance. A 7° angle produces an attractive dovetail, but is a good choice only when a joint is subjected to little stress. Since dovetail angles are often specified as slopes, the chart below lists common dovetail angles and their approximate slopes.

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