03 Mar. 1999|
Reciprocating saw to cut plywood,how to build a toy box bench,can you build your own coffin in australia - Within Minutes
We'll show you a variety of uses for reciprocating saws, along with effective, safe ways to achieve professional results.
Plunge-cut through sheathing by placing the saw's shoe against the roof decking as a pivot. Anticipate problems when cutting into walls and floors where electrical wires, heating vents and plumbing pipes may be present. Learn more about the keyhole saw, designed to cut holes in different materials of differing diameters and the reciprocating saw, a powerful tool best suited for demolition work.
Not many years ago, I would see keyhole saws in use almost daily; now, for many carpenters, keyhole saws have been relegated to the category of rarely used tools.
Nevertheless, the inexpensive and convenient keyhole saw has a place in the fully equipped carpenter’s toolbox. These days, the keyhole saw is sometimes called a compass saw although a few years back the standard keyhole saw had a narrower blade (and could cut quite fine arcs) while the compass saw’s larger blade had coarser teeth and was better suited to curves with larger radii.
Despite the traditional names, what is sold today interchangeably as a keyhole or compass saw is a bit large for cutting keyholes.
The keyhole saw and its near relation the wallboard saw have wooden handles and thin, tapering steel blades. The reciprocating saw, which is sometimes referred to by the proprietary name Sawsall, is a powerful tool and must be used with care. Cordless reciprocating saws are also being introduced, though they are less powerful and less flexible. You can struggle and rip it out with a variety of crowbars and hacksaws or you can use a reciprocating saw and just cut it free.
They're coated with tungsten carbide abrasive grit; use them for cutting stone, ceramic tile and cast iron.
They're disposable and should be changed as often as you sense that a dull blade is slowing the cutting. First, make a pass with a circular saw at its deepest blade setting and then finish the cut with the recip saw. With a recip saw, the blade may be stopped, but the tool (and you) keeps jerking back and forth. The responsibility for this lies with the saber saw, which will perform most of the tasks for which the keyhole saw has traditionally been used—and does all the work with virtually no elbow grease required.
Smaller keyhole saws were commonplace in years past, in part because they were traditionally made from the broken blades of larger saws. Still, the keyhole saw can be used to cut holes for large-diameter pipes, vents, plug or switch boxes, and other purposes.
Two hands are needed for proper control, one at the pistol grip where the on-off trigger is located, and the other on the body of the saw to stabilize it while cutting. They are available in various lengths ranging from about four inches (for scroll cutting) to as long as nine or even twelve inches (for rough cutting of wood). It's a workhorse that gets its name from the short, back-and-forth cutting stroke of the blade.
Dust and debris can shake loose while cutting in older ceilings; always wear safety glasses and a dust mask as needed. They are used away from the edge of a board, panel, or sheet of plywood, or for cutting in tight places where an ordinary handsaw could not be used.
Some models come with variable speed controls, which make for more efficient cutting through various materials.
Metal-cutting blades are also sold that can cut through nails, bar and angle stock, and metal tubing. Some models are designed to use replaceable or interchangeable blades and are sometimes sold as utility saw sets. Though it is designed for cutting on the horizontal (with the blade moving backward and forward, unlike the saber saw’s up-and-down stroke), the reciprocating saw can be used at all sorts of angles for demolition and rough-cut purposes. Remember, metal-cutting is done at slower speeds, but softer materials like wood can be cut at a higher rate. This works for window and door openings, wall and roof ends, and anyplace else where you let plywood sheathing run wild. Because of this feature, you can use it in situations where other saws would be slow, impractical or pose a greater safety risk. Compared with a circular saw, a reciprocating saw is easier to control when you're cutting above your head or working from a ladder. The narrower the blade, the tighter the curve it can cut; finer blades are preferable for cutting plywood.
More often, the reciprocating saw is used for its brute strength, to saw through walls or ceilings, creating openings for windows, plumbing lines, or other purposes.