วันพฤหัสบดีที่ 23 เมษายน พ.ศ. 2552


A backsaw is a small handsaw useful for woodworking projects.

What Is a Backsaw

A backsaw is a specialized handsaw for cutting tenons (joints or grooves) in wood. The blade is rectangular, 8 to 14 inches in length, with a hardwood or plastic handle and a metal-reinforced back edge (opposite the teeth) to keep the blade from bending while cutting. There are 11 to 20 teeth, or points, per inch. Backsaws are used to cut across the wood grain similar to the larger and more flexible crosscut saw.

How to Safely Use a Backsaw

To safely use a backsaw, first make sure that the wood is firmly held in a wood vice or by clamps so it does not move during cutting. Measure and mark the cut with a pencil. Place the saw's central teeth on the line and push the saw to initiate the cut. Continue by cautiously guiding the teeth over the line, steadying the blade as needed with your different hand. Work slowly and cautiously for best results. When done, cautiously lay the saw down where the teeth will not damage different surfaces or cut you.

How to Maintain a Backsaw

Backsaws require periodic sharpening by a professional saw sharpener or with a quality saw sharpening tool available at major hardware stores and several larger saw shops. Keep your backsaw sharp for safety and for optimum cuts.

วันพฤหัสบดีที่ 9 เมษายน พ.ศ. 2552

Coping Saw

Coping saws are useful for producing curved cuts on thinner materials around the home and shop.

What Is a Coping Saw

A coping saw uses a very thin metal blade stretched on a metal frame to make turning cuts on wood, plastic, or metal depending on the blade selected. The U-shaped frame has a swiveling spigot (clip) at each end to hold the ends of the blade. A hardwood or plastic handle allows the user to turn the blade during the cut. Most coping saws have 12 to 15 teeth per inch, though coarser and finer blades are accessible for specialized jobs.

How to Safely Use a Coping Saw

To install a blade, set the frame's front edge on a bench and hold the handle so it is pointing up. Attach one end of the blade to the spigot farthest from the handle. Then press down on the handle to compress the frame so the other end of the blade able to be attached. Release tension and adjust the spigot as needed.

To safely use the coping saw, firmly hold the material in a vise or with clamps. Place the saw's central teeth on the line to be cut and push the saw in a short stroke to start the cut. Continue the cut, turning the handle and frame as needed to follow the cut line. For safety, keep hands and other objects away from the sharp teeth.

How to Maintain a Coping Saw

Replacement coping saw blades are accessible at most hardware stores. Make sure you select the appropriate blade as indicated by the number of teeth per inch.