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String trimmers powered by an internal combustion engine have the engine on the opposite end of the shaft from the cutting head, while electric string trimmers typically have an electric motor in the cutting head, but there are other arrangements, such as where the trimmer is connected to heavy machinery and powered by a hydraulic motor.
The engines are small in both physical dimensions and power output, relative to larger automobile engines.Power outputs are typically less than 11 kW (15 hp). The smallest of all are used in handheld garden machinery, such as string trimmers and chainsaws, which have a displacement as small as 24 cc (1.5 cu in). [2]
Blade reel/cylinder: Consists of numerous (3 to 7) helical blades that are attached to a rotating shaft. The blades rotate, creating a scissor-like cutting motion against the bed knife. Bed knife: The stationary cutting mechanism of a cylinder/reel mower. This is a fixed horizontal blade that is mounted to the frame of the mower.
A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener.
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Most line-shaft-drive machines, ubiquitous circa 1880–1930, have been scrapped by now ... [21] 1810s–1830s ... and using the control to go straight from drawing ...