AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTMOULD STRENGTH TESTER (AFS)IGENERAL PRINCIPLESThe Mould Strength Tester is used to measure the green compression strength of moulds onthe foundry floor. Any reasonable flat or gently curved mould surface may be used. Thetester can be operated at any angle, thus making it possible to take strength measurementson vertical surfaces of a mould.A reading is obtained, which is comparable to the green compression strength test, obtainedon a standard test specimen, rammed to the same degree as the mould.IIDESCRIPTIONThis instrument is a dial gauge indicator calibrated in psi with a specially shaped, springloaded probe, marked with a graduation line ⅜ inch from the tip.It is designed as a pocket instrument and has a capacity of 0-30 psi.IIITEST PROCEDURE(a)(b)Release the bezel clamping screw and rotate the milled bezel until the indicatingpointer is at zero. Re-clamp the bezel. Turn the centre button to bring the slavepointer to rest against the indicating pointer.Holding the tester at right angles to the mould surface, press the probe slowly intothe sand. The force applied should be only enough to keep the probe just movinginto the surface.129