AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTTRANSVERSE SHELL STRENGTH ACCESSORY FOR USSM (AFS) (cont’d)IIITEST PROCEDURE(a)Attach the support arm with the two knife edges to the pusher arm and the arm withthe single knife edge to the pendulum weight of the Universal Sand Strength Machineby means of the bolts and washers provided.NOTE: Hand Operated USSM: for hand operated universal machine, when fitting thetransverse core strength and transverse shell strengthaccessory the 1¾” bolt will be substituted with a 1½”bolt.Motorised USSM: Secure the left hand part of the accessory with a 1½”long x ¼” BSW* bolt plus collar in the top position and a1¾” x ¼” BSW* bolt with a flat washer in the bottomposition.The right hand part of the accessory will be securedwith a ½” x ¼” BSW* bolt with a stepped collar in topand bottom positions.(b)(c)(d)Place the specimen on the supports of the testing machine so that the smooth side ofthe specimen rests on the two bearing knives and the single-loading knife edge restson the side of the specimen that was strickled off.Apply the load in the recommended manner until the specimen breaks.Read the dry shear scale and multiply by 4 to give the load supported by thespecimen in pounds. Test at least 10 transverse test specimens. Specimens thatare manifestly faulty shall not be considered in determining the transverse strength.The average of the acceptable values shall be reported as the transverse strength ofthe group.IVRECOMMENDED SPARESPart NoDescription2005 Stepped Collar.* BSW is British Standard Whitworth thread.98