AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTHAND OPERATED UNIVERSAL SAND STRENGTH MACHINE (AFS) (cont’d)IVTEST PROCEDURE (cont’d)(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 ¼ inch clearance between the rubber bumper and the lug on theweight arm.Apply the load uniformly until the specimen shears.Read the lower edge of the magnetic rider on the scale designated “GreenShear”.Remove the sheared specimen as under (A) “Green Compression Strength”,section (f).(C)Dry Compression and Dry Shear Strengths(a)(b)(c)(d)(e)(f)Place either the compression heads or the shear heads in the top position ofthe machine. This position increases the load applied by a factor of 5.Prepare AFS standard 2 inch diameter x 2 inch height test specimens in theusual way and dry in an oven at 110 °C for 2 hours.When cool, place in position between test heads and adjust clearancebetween rubber bumper and lug on weight arm to approximately ½ inch usingthe adjusting screw in the pusher arm.Apply the load as for “Green Compression” and “Green Shear” until thespecimen collapses.Read the scale designated “Dry Compression” or “Dry Shear” according tothe test heads being used.Remove the broken specimen as under (A) “Green Compression Strength”,section (f).84