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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 ]
Cold saw blades are used to cut metal using a relatively slow rotational speed, usually less than 5000 surface feet per minute (SFM) (25 m/s), and a high chip load per tooth, usually between .001"–.003" (0.025–0.08 mm) per tooth. These blades are driven by a high power motor and high-torque gear reduction unit or an AC vector drive.
In 1923, Michel created a motorized machete, which had a 6-inch (150 mm) saw-blade mounted on carved wooden frame and powered with a motor taken from a malted milk mixer – the first electric handsaw. [3] After reading about Michel’s new invention, Joseph Sullivan, a Minneapolis land developer, set out to find the New Orleans inventor.
The most common blade is the 12 inch or 300 mm length. Hacksaw blades have a hole at each end for mounting them in the saw frame and the 12 inch / 300 mm dimension refers to the center to center distance between these mounting holes. [4] The kerf produced by the blades is somewhat wider than the blade thickness due to the set of the teeth.
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
Pruning saw: the commonest variety has a 30-71 cm (12-28 inch) blade, toothed on both edges, one tooth pattern being considerably coarser than the other; Ripsaw : for cutting wood along the grain; Rule saw or combination saw: a handsaw with a measuring scale along the back and a handle making a 90° square with the scaled edge;
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