8 Tones 10 Tones 20, Tones 40 Tonés etc., For ex:-A specimen of 6 tones capacity gives more accurate,, result of 10 Tones capacity range instead of 20 Tones capacity, range. The on & off switch provided on the control panel, & the pilot lamp shows the transmission of main supply.,, METHOD OFTESTING, Initial Adjustment:,, before testing adjust the pendulum,, with respect to capacity of the test i.e. The switches have upper and lower push at the, control panel for the downward & upward movement of the,, movable head. The loading system works as,, described below., the,, The return valve is close, oil delivered by the pump through, flow control valves to the cylinder & the piston goes up.,, Pressure starts developing & either the specimen breaks or the, oad,, having,, maximum value is controlled with the base, aynameters consisting in a cylinder in which the pistoon,, 7 The four valves on control panel control, the oil stroke in he hydraulic system. There is an arrangement for loosing or,, tightening of the valve. The suction, & delivery value are fitted to the pump near tank Electric motor,, driven the pump is mounted on four studs which is fitted on the, right side of the tank. The pump is fixed to the tank from bottom.
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The pump is displacement type piston pump,, having free plungers those ensure for continuation of high, pressure. fix,, CONTROLPANEL:, It consists of oil tank having a hydraulic oil level sight glass for,, checking the oil level.
The measurement of this assembly is,, carried out by number of bearings which slides over the columns., The test specimen each fixed in the jaw is known as'Jack, To, up the specimen tightly, the movement of jack jaw is, achieved helically by handle.,, jaw'.
There is a connection, between lower table and upper head assembly that moves up and, down with main piston. Each column passes through the main nut which is fitted, in the lower cross head., The lower table connected to main piston through a ball &, the ball seat is joined to ensure axial loading. The screw column, maintained in the base can be rotated using above arrangement, of chain. The chain driven by electric, motor which is fitted on right hand side. THEORY:The Universal Testing Machine consists oftwo units., 2) Control panel., 1) Loading unit,, LOADING UNIT, It consists of main hydraulic cylinder with robust base inside.,, The piston which moves up and down.
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