AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERT(AFS) LABORATORY SAND RAMMER (TYPE ‘N’) (cont’d)IVTEST PROCEDURE (cont’d)(d)(e)Transfer the sample to the specimen tube, level out the surface of the sand ifnecessary. (To obtain uniform distribution of contents and more even ramming ofstrong sands, place a second pedestal cup over the top of the tube and invert tubebefore placing under the ramming plunger).Use the cam positioned on the left hand side of the rammer to raise the plunger ofthe rammer. Insert the specimen tube and cup containing the sand under theplunger and make sure that the spigot on the cup is located in the hole in the base ofthe rammer frame.Rotate the cam to release the plunger head to enable it to enter the tube and come torest gently on the sand.(f)(g)(h)Ram with three drops of the sliding weight by turning the cam handle threerevolutions. (In special cases it may be necessary to give more than three rams; ifthis is done it should be mentioned when reporting results). The top of the plungershaft will be level with the centre line ‘O’ on the tolerance plate when the height of thetest piece is exactly 2 inches.Unless the specimen is required for green permeability or shatter index tests, stripfrom the tube by inverting over the stripping post and pushing tube gentlydownwards.When ramming sands which are very weak in the green state use a split specimentube in place of the standard precision tube. After ramming remove the bottom cup,place on a flat drying plate and loosen the clamps. The specimen is left on the plateby lightly tapping and removing the two halves of the tube without deforming thespecimen.VMAINTENANCEKeep the machine clean and free from loose sands. Moving parts should be lubricated withlight oil at regular intervals. Lightly grease the underside of the sliding weight to minimisewear on the cam.VIRECOMMENDED SPARESPart NoDescriptionLSR 25BRammer plunger head311 Pedestal cup313 Precision specimen tube314 Stripping post340 Securing screw – Split specimen tube341 Drying plate - Split specimen tube391 Swab – Tube conditioner.40