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This saw's invention also spurred the use of worm drive gearing, a dual-field motor, and die-cast aluminum motor housing. In 1937, its successor, the SKILSAW Model 77, became the benchmark of portable saws, [5] along with the SKILSAW Model 87 circular saws, and it continues to be used on job sites across the United States.
SKIL can trace its heritage to the invention of the circular saw by Edmond Michel in 1924, which led to the development of the SKILSAW circular saw Model 77 in 1937. Now referred to as “the saw that built America,” the Model 77 set the industry standard for handheld worm-drive circular saws which remains in production almost unchanged today ...
Initially, Michel mounted a mixer motor onto a standard machete, as well as a worm wheel gearbox and a 2-inch circular blade. This invention, while working fairly effectively, required an external generator, making it impractical for use. In creating this device, Michel effectively created an early example of a motorized worm drive.
The company later renamed itself Skilsaw Inc. Portable circular saws are often still called Skilsaws or Skil saws. Its successor is still sold by Skil as the model 77. To get around the Skil patents, Art Emmons of Porter-Cable invented the direct-drive sidewinder saw in 1928.
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A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear). Its main purpose is to translate the motion of two perpendicular axes or to translate circular motion to linear motion (example: band type hose clamp ).The two elements are also ...
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