THE CIRCULAR SAW

Article Tools

Image Gallery

Print

E-mail

Comments

RSS

Most circular saws use a 7 1/4"-diameter blade, though saw sizes from 4 3/8" to 16" are available. A 7 1/4" blade will give a cutting depth of almost 2 1/2" on a perpendicular cut; at a 45° tilt, that bite shrinks to less than 2". In practical terms, this means that it'll handle a 2 X 4—or anything thinner—with no problem, if the power's available.

Power, however, is a tricky term, since manufacturers use several rating methods. So, rather than rely upon horsepower figures alone, you're wise to verify the tool's actual amperage draw and arbor speed, if available. These two numbers are important because they determine the saw's potential.

In simplest terms, higher arbor speeds generate smoother cuts. But the blade's rpm drops significantly when it's buried in its work, so you'll need a high-amperage motor to maintain a reasonable (over 4,000 rpm) arbor speed. Though it's true that an inefficient motor can draw impressive amperage (and promptly convert it to heat instead of power), there's likely to be a telltale penalty in tool weight. It's probably safe to say that a 10- or 12-amp motor can handle most heavy cutting, including the long rips that tend to bind blades.

From a durability standpoint, look for the best within your price range. Good, solid castings and ball-bearing construction are expensive, but they're hard to beat. You can expect to replace brushes and to lubricate occasionally, so make sure the motor's accessible.

Balance is important with a sidewinder, as is handling comfort. There's little advantage to an ungainly one, since the worm-drive designs are superior on most other counts. For convenience, hold out for features like a lockable trigger, easy-to-operate blade depth and tilt adjustments, and a blade lock for changing blades. For safety, look for a smoothoperating, spring-loaded blade guard, a double-insulated motor, and—if it's available—an electric blade brake.

At least one manufacturer offers an adjustable cutting guide in the interest of ac curacy. Most machines also have scales built into the tilt and depth adjustments for the same reason. Though they are nice touches, these gauges can seldom be relied upon for close work.

In short, shop for a saw as if you were shopping for a car: Figure out what you need, choose the best you can afford, and spend time searching for the lowest price. When trading with volume dealers, you can expect discounts of up to 40% during promotional sales. But remember: Good service and good advice are as valuable as cash.

RSS | Comments | E-mail | Print