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[3] The first portable power router was patented in 1906 by George Kelley and marketed by the Kelley Electric Machine Company. [4] The early electric routers were quite heavy, [5] and only nominally "portable". In 1915 Oscar and Rudy Onsrud produced an air-powered router, which they referred to as a Jet Motor Hand Router. [6]
This was a big safety concern as people's hand were very accessible to the cutter. In 1976, C.R. Onsrud patented [2] the Inverted Pin Router [3] that reversed the two and mounted the motor under the table and the guide pin on the "over arm". A template (with an interior recess on the top face removed) is affixed to the workpiece, and the guide ...
A computer numerical control (CNC) router is a computer-controlled cutting machine which typically mounts a hand-held router as a spindle which is used for cutting various materials, such as wood, composites, metals, plastics, glass, and foams.
The first German jet engines built during the Second World War used a mechanical APU starting system designed by the German engineer Norbert Riedel.It consisted of a 10 horsepower (7.5 kW) two-stroke flat engine, which for the Junkers Jumo 004 design was hidden in the intake diverter, essentially functioning as a pioneering example of an auxiliary power unit for starting a jet engine.
The practicality of jet propulsion had been demonstrated in Germany in early 1937 by Hans von Ohain working with the Heinkel company. Recognising the potential of the invention, the Reich Air Ministry (German: Reichsluftfahrtministerium, abbreviated RLM) encouraged Germany's aero engine manufacturers to begin their own programmes of jet engine development, offering contracts to both Junkers ...
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