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In 1994, DeWalt took over the German woodworking power tool producer ELU, and used ELU's technology to expand their tool line. As of 2001, they manufacture and sell more than 200 hand power tools and 800 accessories. [2] DeWalt is now a popular brand of tools for commercial contractors.
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In 1926, Porter-Cable began to develop a niche in portable electric power tools when Chief Engineer Art Emmons invented the portable electric belt sander, called the Take-About Sander. In 1929, Emmons invented the helical drive circular saw, a compact, lightweight design that is still the most widely used circular saw design produced today.
Drive mechanisms can be a single v-belt, a serpentine belt or multiple v-belts. Hybrid saws have a 1.5-or-2 hp (1.1-or-1.5 kW) motor and thus the ability to run on a standard 15- or 20-ampere 120-volt North American household circuit, while a cabinet saw's 3 hp (2.2 kW) or larger motor requires a 240-volt supply.
Early Industrial Revolution-era factories had batteries of power tools driven by belts from overhead shafts. The prime power source was a water wheel or (later) a steam engine. The introduction of the electric motor (and electric distribution networks) in the 1880s made possible the self-powered stationary and portable tools we know today. [ 19 ]
Flat belt on a belt pulley Belt and pulley system Cone pulley driven from above by a line shaft. A belt and pulley system is characterized by two or more pulleys in common to a belt. This allows for mechanical power, torque, and speed to be transmitted across axles. If the pulleys are of differing diameters, a mechanical advantage is realized.
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