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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 ...
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.
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 ...
fig.1. A duplex worm or dual lead worm is a worm gear set where the two flanks are manufactured with slightly different modules and/or diameter quotients. As a result of this, different lead angles on both tooth profiles are obtained, so that the tooth thickness is continuously increasing all over the worm length, while the gap between two threads is decreasing.
The worm is located at the end of the drive shaft and above the crown wheel. The wheelbase of the Model TT is 125 inches (3,175 mm), compared to 100 inches (2,540 mm) for the Model T. It was often equipped with an accessory gearbox , such as the Ruckstell or Jumbo gearboxes, which allow the truck to have intermediate gears between low and high ...
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