AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTMOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE (AFS) (cont’d)IVTEST PROCEDURE(A)Green Compression Strength(a)Place the compression heads in the position shown on the illustration.(b) Raise the weight arm slightly and insert an AFS standard 2 inch diameter x 2inch height test specimen between the compression heads so that the facethat was uppermost in the ramming operation is facing the right-handcompression head. Care should be taken not to damage the specimen.(c)(d)(e)(f)See that the magnetic rider is resting against the pusher plate and that thereis at least 0.25 inch clearance between the rubber bumper and the lug on theweight arm. If this clearance is not sufficient it means that the specimen issmaller than the permitted tolerance and should be discarded.Press the “START” button. When the specimen collapses the machine willreverse and return to zero automatically.Record the reading shown on the lower edge of the magnetic rider, readingthe scale designated “Green Compression Strength”.Remove the sand from the compression heads.(B)Green Shear Strength(a)Place the shear test heads in the lower position in the machine, with the headhaving the half round holder attached to it in the pusher arm.(b) Raise the weight arm slightly and insert an AFS standard 2 inch diameter x 2inch height specimen between the heads.(c)(d)(e)(f)Ensure that the magnetic rider is resting against the pusher arm and thatthere is 0.25 inch clearance between the rubber bumper and the lug on theweight arm.Press the “START” button. When the specimen shears the machine willreverse and return to zero automatically.Read the lower edge of the magnetic rider on the scale designated “GreenShear”.Remove the sand from the shear heads.88