AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTMOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE (AFS) (cont’d)IIDESCRIPTION (cont’d)Automatic operation is by means of push button stop/start control and micro-switches asfollows :-(a) Reverse switch. This reverses the machine after the specimen has collapsed.(b) Stop switch. This stops the machine when it returns to the zero position.(c) Limit switch. This comes into operation if the specimen fails to collapse,returning the pusher arm automatically to zero.The accessories required for the determination of shear, dry, tensile, transverse and splittingstrengths are described separately.IIIINSTALLATION(a)(b)(c)(d)Set the machine on a rigid bench and level by means of the two adjusting screwsuntil the bubble of the spirit level is centred. The front edge of the pusher plateshould now coincide with the ‘O’ line on the scale and the pendulum weight shouldswing freely in the frame, with the pusher plate just clearing the scale.Attach the stop bracket securely to the front of the main casting at the bottom lefthandside, by removing the nuts from the screws supplied and using the two tappedholes provided. The adjustable stop is pre-set and normally does not requireadjustment.*REMOVE THE LOCATING COLLAR AND WASHER FROM THE MAINSHAFT andfit the pusher arm complete with motor unit, so that the stop micro-switch is jut clearof the stop bracket and the reverse micro-switch is just clear of the lug of the weightarm. Secure in position with the two set screws, ensuring that they locate in thedimples in the shaft.The limit switch has been removed for packing purposes. This requires refitting asfollows :-Remove the two screws from the bracket, slide cable in slot in the framecasting so that the rubber grommet sits in counter-bored hole in thecasting. Secure the bracket with the two screws in the tapped holesprovided.(e)Connect the motor unit to the control unit on the main frame by means of the eightpinplug and socket outlet.(f)Connect to appropriate power supply (see motor nameplate for correct voltage andfrequency) using a three-pin plug.* In the event of the machine coming to rest away from the zero position this can berectified by slackening the knurled check nut on the stop bracket and screwing theadjustable stop in or out as required.87