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After the Great Depression, In 1928, Skil released the Model E Skilsaw, the first generation saw with a worm drive. In 1937, Edward Sterba built the first Model 77 with a 7 + 1 ⁄ 4-inch (180 mm) blade, considered the "workhorse on building sites". [6] The 75th anniversary of the Model 77 was in 2012.
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British Standard Cycle (BSC or BSCy or CEI) is a British Imperial screw thread standard. Unlike other major British imperial thread standards ( British Standard Whitworth and British Standard Fine ) the thread runs at a 60 degrees rather than a 55 degrees angle .
In the 1870s, the limitation of log size due to the radius of the circular saw was improved with the introduction of the double circular saw- with one blade atop the other. In the 1880s, the band saw was introduced and was able to allow the head saw to handle logs of nearly unlimited size, ideal for the Californian redwoods. [1]
The following year, 2016, brought three new metal cutting saws, including the first 8-inch worm drive optimized for metal, a 12-inch dry cut saw and a 14-inch abrasive chop saw. [ citation needed ] In addition to metal cutting, SKILSAW also announced a saw for fiber cement in 2015 [ 7 ] and the first worm drive saw for concrete in 2016. [ 8 ]
The log is cut in a forward direction as with a single-cut but as the log returns, the saw de-burrs the cut (path where the saw passes) allowing for a cleaner finish. They are run for 4 to 24 hours then sent to the saw filer for maintenance. The saw filer inspects the saw for needed repairs then gums, fits and benches the saw as necessary.
A dragsaw or drag saw is a large reciprocating saw using a long steel crosscut saw to buck logs to length. Prior to the popularization of the chainsaw during World War II, the dragsaw was a popular means of taking the hard work out of cutting wood. They would only work for a log on the ground. [1]