Saw
.jpg)
A saw is a tool used to cut things.
There are many kinds of saw. Some of them are hand tools that work with muscle power, like the saw in the picture. Some saws have other sources of power and can be very powerful, such as a chainsaw that is used to cut down trees.
The work carried out with a saw is usually noisy. Using a saw to cut materials is dangerous because of sharp teeth. Care must be taken not to let sharp edges touch the skin. Parts of the material being cut can fly off the work and become a hazard to breathing, to eyes and to the skin.
Hand saws
Or hand powered saws. These use the motion of a person's arm to make a cut.
Push saws
Many saws are designed to cut on the push stroke (when the saw is pushed forward).[1]
Pull saws
The Lua error in Module:Unicode_data at line 293: attempt to index local 'data_module' (a boolean value). is a type of saw used in woodworking. These saws typically cut on the pull stroke (when the saw is pulled backwards).[2]
Power saws
There are several kinds of mechanically powered saws. Some are powered by electricity from a wall socket. Others are powered by batteries. Still others can be powered by Internal combustion engines, steam, or water power.
Chain saw
A saw designed to cut down trees or cut branches from trees is a chainsaw. A chainsaw is named for the row of teeth attached to a flexible chain. The cut is often very rough and often has splinters.
Circular saws
Circular saws use a round blade, usually between 7 and 10 inches. They are often very powerful and can cut through hard or soft wood. They use interchangeable round blades.[3] The blade can be designed to cut any of a number of kinds of materials from steel, to wood, to masonry.
Jig saws
Jig saws move the blade up and down to cut through materials. The stroke (or up and down movement) is usually less than one inch (25.4 mm). These saws are very good for making curved cuts.[4] Jig saws use a variety of interchangeable blades for cutting different materials. Some blades make very smooth cuts.
Saw Media
Diagram showing the teeth of a saw blade when looking front-on. The teeth protrude to the left and right, so that the saw cut (kerf) is wider than the blade width. The term set describes how much the teeth protrude. The kerf may sometimes be wider than the set, depending on wobble and other factors.
Roman sawblades from Vindonissa approx. 3rd to 5th century AD
Bronze-age saw blade from Akrotiri, late Cycladic period c. 17th century BC
Rip sawing c. 1425 with a frame or sash saw on trestles rather than over a saw pit
Circular wood-cutting saw at Maine State Museum in the capital city of Augusta, Maine
This particular circular saw, which cut wood into segments to fit a wood-burning kitchen stove, is displayed at the Cole Land Transportation Museum in Bangor, Maine.
Reconstruction of the hydraulic saw by Leonardo da Vinci (Codice Atlantico foglio 1078) exposed at the Museo nazionale della scienza e della tecnologia Leonardo da Vinci, Milan.
A man recording the sound of a saw for sound effect purposes in the 1930s.
References
- ↑ Japanese Architecture and Art Net Users System (JAANUS), Nokogiri; retrieved 2012-4-13.
- ↑ Takenaka carpentry tools Museum, Nokogiri Archived 2012-04-24 at the Wayback Machine; retrieved 2012-4-13.
- ↑ Andy Engel, Carpentry Complete: Expert Advice from Start to Finish (Newtown, CT : Taunton Press, 2011), p. 14
- ↑ Chris Marshall; Philip Schmidt, A complete guide to basic woodworking: skills & projects every woodworker needs (Chanhassen, MN: Creative Pub. International, 2005), p. 20
