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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 ...
In a worm-drive saw, the blade is driven by a perpendicularly mounted motor using worm gears, which give higher torque. The worm-drive portable circular saw was invented in 1923 by Edmond Michel. In 1924 Michel formed a partnership with Joseph Sullivan, and together they started the Michel Electric Handsaw Company , with the sole purpose of ...
In creating this device, Michel effectively created an early example of a motorized worm drive. [better source needed] Michel then tried again, using a piece of wood with a notch carved into it. In the notch, he mounted the same mechanism as the mechanical reaper, but with a 6-inch blade. This was the first electric circular saw. [4]
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 ...
A worm is meshed with a worm wheel, which looks similar to a spur gear. Worm-and-gear sets are a simple and compact way to achieve a high torque, low speed gear ratio. For example, helical gears are normally limited to gear ratios of less than 10:1 while worm-and-gear sets vary from 10:1 to 500:1. [45]