Grinding wheel manufacture

Claim 1

THE METHOD OF MAKING A GRINDING WHEEL HAVING GRIDING CHARACTERISTICS SIMILAR TO THOSE OF A HARD RUBBERBONDED GRINDING WHEEL WHICH COMPRISES UNIFORMLY MIXING ABRASIVE GRAINS WITH A POWDERED VULVANIZING AGENT THEREBY COATING THE ABRASIVE GRAINS WHILE DRY, WETTING THE RESULTING COATED ABRASIVE GRAINS WITH A SOLUTION OF A LIQUID BUTADIENE-ACRYLONITRILE COPOLYMER IN FURFURAL, THE RATIO OF SAID LIQUID COPOLYMER TO SAID FURRURAL RANGING FROM 70:30 TO 10:90 ON A WEIGHT BASIS, ICORPORATING THE RESULTING WETTED ABRASIVE GRAINS WITH A DRY POWDERED BLEND OF A POWDERED THERMOSETTING PHENOL-ALDEHYDE RESIN, LIME AND FILLER IN SUCH A WAY AS TO COAT THE WETTED GRAIS WITH SAID BLEND AND FORM A FREE-FLOWING POURABLE GRANULAR MIX, FILLING A PRE-HEATED MOLD WITH SAID FREE-FLOWING POURABLE GRANULAR MIX, HEATING THE MIX AT RELATIVELY LOW PRESSURE IN SAID MOLD AT A TEMPERATURE OF BETWEEN 300* AND 400*F. UNTIL THE BOND SOLIDIFIES BY GELLING AND PARTIALLY SETS UP, CONFINING THE RESULTING SHAPE UNDER POSITIVE MECHAMICAL PRESSURE OF BETWEEN 1,000 AND 5,000 LBS. PER SQUARE INCH AND HEATING IT WHILE SO CONFINED AT A TEMPERATURE OF BETWEEN 300* AND 400F. INTIL CURING OF THE BOND IS COMPLETED.