A saw is a tool that uses a hard blade or wire with an abrasive edge to cut through softer materials. The cutting edge of a saw is either a serrated blade or an abrasive. A saw may be worked by hand, or powered by steam, water, electric or other power.
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A saw is a tool that uses a hard blade or wire with an abrasive edge to cut through softer materials. The cutting edge of a saw is either a serrated blade or an abrasive. A saw may be worked by hand, or powered by steam, water, electric or other power.
In a modern serrated saw, each tooth is bent to a precise angle called its set. The set of the teeth is determined by the kind of cut the saw is intended to make. For example, a rip saw has a tooth set that is similar to the angle used on a chisel. The idea is to have the teeth rip or tear the material apart. Some teeth are usually splayed slightly to each side of the blade so that the cut width (kerf) is wider than the blade itself and the blade does not bind in the cut. The kerf of the blade is adjusted with a tool called a saw tooth setter.
An abrasive saw uses an abrasive disc or band for cutting, rather than a serrated blade.
According to Chinese tradition, the saw was invented by Lu Ban.fact: date=April 2009 In Greek mythology, Talos, the nephew of Daedalos, invented the saw. In fact, saws date back to prehistory, and likely evolved from Neolithic tools or bone tools. The early ancestors of man, in the Pleistocene era, likely first used a jaw bone of bovid animals as a saw.
Types of saw blades and the cuts they make
Blade teeth are of two general types: Tool steel or carbide. Carbide is harder and holds a sharp edge much longer.
- Band Saw Blade: A straight blade welded into a circle. Used mainly at sawmills & steel service centers. Preferred over circular saws due to less waste.
- Crosscut: In woodworking, a cut made at (or near) a right angle to the direction of the grain of the workpiece. A crosscut saw is used to make this type of cut.
- Rip cut: In woodworking, a cut made parallel to the direction of the grain of the workpiece. A rip saw is used to make this type of cut.
- Plytooth: A circular saw blade with many small teeth designed for cutting plywood with minimal splintering.
- Dado blade: A special type of circular saw blade used for making wide grooved cuts in wood so the edge of another piece of wood will fit into the groove to make a joint. Dado blades can make different width grooves by addition or removal of chipper blades of various widths between the outer sadaio blades. This first type is called a stacked dado blade. There is another type of dado blade capable of cutting variable width groove. Das. An adjustable dado utilizes a movable locking cam mechanism which causes the blade to wobble sideways more or less. This allows continuously variable groove width from the lower to upper design limits of the dado.
Materials used for saws
There are several materials used in saws, with each of its own specifications.
