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Description: It is not very long ago that engineers had no alternative but to use mechanical drives in every situation, and there is thus a strong tendency to continue thinking only in terms of power transmission by mechanical connection but at the present day, four possible methods of transmission are available to a machinery designer. These are the mechanical system, the hydraulic system, the pneumatic sys tem and the electrical system. In considering the relative merits of these alternatives, the major and over riding point is that any one of the last three gives complete freedom for the functional design of a machine this is because the transmission consists essentially of a flexible arrangement of pipe or cable between the driving and the driven members In the case of a mechanical system, how ever, the configuration of the machine must be such as to permit positive connection between driving and driven components. In other words, the flexibility of the hydraulic, pneumatic and electrical system allows the functional requirements of the ma chine to be the foremost consideration, whereas the rigidity of a mechanical system imposes severe limitations and forces a designer to think predominantly in terms of a suitable mechanical route. The second major point is that each of these three flexible systems can provide step-less speed variation over a wide range and can be stalled without damage the latter feature is an advantage over variable-speed V-belt drives and so is the wider range of step-less variation which can be affected. On the other hand, a positive mechanical connection between components is most suit able where a precise fixed speed is required under variable load.
Keywords: mechanical, electrical or hydraulic transmission?
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Citation: Southwell, P. H. 1960. MECHANICAL, ELECTRICAL OR HYDRAULIC TRANSMISSION? . Canadian Agricultural Engineering 2(1):24-27.
Volume: 2
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Date: 1960
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Coverage: Canada
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