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Portable sawmills are sawmills small enough to be moved easily and set up in the field. They have existed for over 100 years but grew in popularity in the United States starting in the 1970s, when the 1973 oil crisis and the back-to-the-land movement had led to renewed interest in small woodlots and in self-sufficiency .
The modern-day circular saw was invented around the end of the 18th century as a rip-saw to convert logs into lumber in sawmills and various claims have been made as to who invented it. Before the design was invented, logs were sawn by hand using a pit saw or using powered saws in a sawmill using an up-and-down saw with a reciprocating motion ...
All sawmills use ripsaws of various types including the circular saw and band saw. Historically sawmills used one or more reciprocating saws more specifically known as an "up-and-down" or "upright saw" which are of two basic types, the frame saw or a muley (mulay) saw [2] which is similar to the hand powered pit saw. Some sawmills also use ...
Howe & Howe Technologies (H&H, H and H, or HH) is an American private business headquartered in Waterboro, Maine that specializes in the development, manufacturing, fabrication and design of specialized armored and military-grade-spec vehicles, most notably the Ripsaw combat vehicle. [1]
The Ripsaw MS1 was a test platform made to test off-road capabilities. It was exclusively unmanned, cost $200,000 and could accelerate from 0–65 mph (0–105 km/h) in 3 seconds. [3] [4] Ripsaw MS2 UGV is made to be larger, faster, and more modular than the MS1. It weighs 4.5 short tons (4.1 t) and can carry a one-short-ton (0.91 t) payload.
Felling saws were used to fell the trees, and bucking saws were used to cut felled trees into log lengths for the sawmill. [3] The two applications require slightly different designs: a felling saw has a narrower blade, allowing wedges to be more easily inserted, while a bucking saw has a wider blade, giving it more strength.
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