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Wednesday, 27 November 2013

Advantages of Hydraulic Power Transmission

Advantages of Hydraulic Power Transmission Points : Advantages of Hydraulic Power Transmission. Easy in Control, No Mechanical Parts, Simple Installation, Separate Controls, Smooth Application of Power, Rapid Directional Changes, Flexibility, Contour Machining Possible Although some of the advantages of hydraulic-power transmission have already been mentioned, some are repeated among those listed below, for the sake of emphasis. 1. Easy in Control The easy control of the force, that is, the rate of flow or pressure, or both, that may be applied. Even, positive motion at all loads. The accurate and convenient controls themselves- the valves by means of which a variety, of motions such as table drive, feeds, (speeds and feeds), and clamping may be obtained, in a cycle automatically. The range of step-less speeds and feeds from zero to maximum, any one obtainable almost instantly without stopping the machine, large forces can be controlled by small forces. 2. No Mechanical Parts There is no need for a complicated system of belting, gearing, cams and levers. Lubrication of all parts is inherent in the unit. 3. Simple Installation Installations are simple and power can be transmitted up, down, around corners and over relatively long distances with little loss in efficiency. 4. Separate Controls The cutting speed and feed units are separate and can be controlled independently, and may also be adjusted to meet the requirements of each. 5. Smooth Application of Power Transmitted motion is remarkably smooth, steady cutting action, no gear marks or chatter; tools last longer. Maximum pressure is generated almost instantly at the start of the cut and remains constant during the entire cutting stroke. For example, the cutting speed and power, in the shaper and planer, reaches maximum almost instantly and remain constant during the whole stroke. 6. Rapid Directional Changes Rapid reversals at the end of the cutting stroke are cushioned and shock free because there is no metal to metal contact. For example, the rapid reversals at each end of the reciprocating stir; that is, they are especially smooth and shook-less. This cushioning effect may be increased, if advisable, by the addition of a dashpot. The cushioning action known as Dwell can be increased or decreased as needed. Dwell at the end of the feed may be provided to work automatically. This feature is often desirable in finish milling to a filleted corner, spot facing, etc. Direct application of the power is provided. In the planer, for, example, the hydraulic cylinder is close up under the platen. 7. Flexibility A great number of motions as locating, clamping, feeding, driving, etc. are possible and can be built into a single machine. And in the use of the unit idea in construction, which permits of easily made changes at comparatively low cost when, for example, improved machining conditions might warrants a different valve or pump, or possibly an extra pump. Also in the commercial units themselves - many sizes, readily obtainable, all designed for compactness, durability, efficiency, and for convenient location and assembly with respect to the other machine units. 8. Contour Machining Possible Precision contour machining is possible through the application of special hydraulic valving systems. Tool feed is controlled automatically by a stylus (mounted to a hydraulic piston) as it traces over a master template or pattern. One, two and three dimensional cutting is possible. Several cutting units can be controlled by one tracing unit.

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