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By W. Bolton

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Power presses are electrically driven. An electric motor is used to store energy in a flywheel; the energy being subsequently taken from the flywheel to activate the ram. Power presses can generate large amounts of energy and produce large forces. Hence the limitation to the work that can be handled is determined only by the size of the machine. Compared with fly presses, power presses are expensive, not only in initial capital cost but also in tooling cost. The speed of a power press is, however, greater than that of a fly press and continuous production is possible.

2 and the effect of changing the cutting speed from, say, 180 m/min to 90 m/min. Hence, Tooling cost for 90 m/min oc 90 1/0 2 Tooling cost for 180 m/min ex 1801/0 2 Tooling cost for 90 m/min 90 1/0 2 Tooling cost for 180 m/min = 180Λ Ι / 0 . 031 of the 180 m/min cost. Lest it be thought that slower cutting speeds inevitably mean lower production cost, account has to be taken of the smaller number of components that can be machined per hour at the lower speed. The higher the cutting speed, the shorter the time required to remove the metal.

While a skilled operator is needed for the setting up, a semi-skilled worker can be used for the operation. NC lathes permit even more automatic operation. Planing and shaping Planing is used to produce flat surfaces or slots. 41, the tool being stationary while the workpiece moves. Shaping differs from planing in that the tool moves while the workpiece is stationary, otherwise the principle is the same. Planers tend to be used for larger scale jobs than shapers. However, neither of these tools is very widely used because other machine tools, such as millers or grinders, can do the same job more economically if a large number of parts are to be machined.

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