cutting line. The last two cuts should be those that free the parts from the nailed-together waste. In addition, you can hold workpieces together with two-sided tape. This prevents potential blade damage caused by sawing through nails. However, tape may not hold if the stock is warped. For sawing duplicate workpieces with parallel edges, such as chair rails, attach a round fence. See Figure 23-52. Saw the first workpiece to establish the shape. Then secure the fence to the table a given dis- tance from the blade. Hold the material against the fence as you feed through the cut. Patterns can be used with a round fence if the curves are not too tight. The round fence is moved to the blade, which sits in a pocket at the tip of the fence. A pattern is attached to the stock. The pattern rides against the fence, creating an exact duplicate of the part desired. Resawing Resawing using a table saw was discussed ear- lier. Another method is to use a band saw and an auxiliary fence or a pivot block. The width of mate- rial that can be resawn depends on how high the upper guidepost rises. The blade has more of a ten- dency to wander when the guidepost is raised high. Resawing on the band saw is a one-pass process, Figure 23-53. An auxiliary fence can be used or a pivot block can be clamped away from the blade at a distance equal to the desired material thickness. Mark the resaw line on the material. If using a straight fence, you will have to adjust for drift, as explained earlier. Pivot blocks are quicker to set up, but a straight fence Safety in Action Using the Band Saw • Fasten loose clothing, secure long hair, and remove jewelry. • Always wear eye protection. • If you hear a rhythmic click as the wood is being cut, the blade may be cracked. Stop and inspect the machine. • If the blade breaks, shut off the machine and disconnect the power. Lock out the machine before removing the broken blade. • When installing a new blade, make sure the teeth are pointing down, toward the table. • Make sure the blade is properly tensioned. • Lock the upper guide no more than 1/4″ (6 mm) above the workpiece. • Hold the stock firmly on the table as you cut. • Maintain your balance as you cut. • Make relief cuts as necessary. • Keep your fingers away from the point of operation while the blade is moving. • Do not cut a small radius with a wide blade, without first making relief cuts. • Minimize backing out of a kerf. This could pull the blade off the wheels. Goodheart-Willcox Publisher Figure 23-52. A round fence helps saw duplicate work- pieces that have gentle curves. Goodheart-Willcox Publisher Figu re 23-51. Stack material when sawing duplicate workpieces. Blade Clamped round fence Duplicate slat back workpieces First cut without fence Nail Nail 396 Section 4 Machining Processes Copyright Goodheart-Willcox Co., Inc.