General I Nformation
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GENERAL INFORMATION COMPARATIVE MARKING CHARTS Carborundum Blueprint Conversion Chart Carborundum Sharpening Stones Conversion Chart I Carborundum I Norton I DS 1100 ME 21560 3/2% x 1% x H Rim 'h Back % ME 21561 3'h/2lh x 1% x H Rim 'h Back ME 24327 3%12?4 x 11%x H Rim 'A Back % ME 192374/3x11%xH Rim'hBa'ck'h ME 201 15 4%13% x 2 x H Rim 'h Back % ME 21563 5/3C x 1% x H Rim 'h Back % ME 19241 6/4% x 2 x H Rim % Back % ME 19242 715 x 2 x H Rim 3h Back 'h ME 192243x1hxH Type 12 ME 192264~lhx HType 12 ME192296x%xHType12 ME192306x%xHType12 ME107597xUxHType 12 ME 19231 8 x % x H Type 12 -- ME 491 ME 6680 ME 12608 ME11172 ME 731 ME 48967 A 48167 (Plate Print) ME 38555 ME 21 865 ME 21512 ME 92620 A 50831 (Plate Print) ME 23107 A 194516 (Plate Print) A 52814~(~latePrint) ' MD 110672 ME 37271 ME 46790 ME 30116 A 83831 (Plate Print) MF .?nonti ME 28214 A 47466 (Plate Print) A 47218 (Plate Prlnt) A 94072 (Plate Pr~nt) A 59358 (Plate Prlnt) MD 31130 ME 62845 MC 27036 MC 2641 3 --ME 18265 MB 40553 A 83831 (Plate Prlnt) ME 24180 A 50937 (Plate Prlnt) MC 40553 MB 24657 ME 45589 ME 39273 ME 76472 ME 71852 ME 22100 ME 71438 ME 102535 ME 68502 This document is for viewing while on this website only. Copying, printing, saving or otherwise duplicating this document is prohibited and violates the Terms Of Use agreement. GENERAL INFORMATION REDUCING BUSHINGS METRIC CONVERSIONS (Refer to ANSI 87.1, Section 6.5) For wheels less than 10" diameter, the hole diameter normally should not be reduced more than 'A". Wheels 10" diameter and larger can be reduced safely %". If the hole reduction exceeds theseguidelines, it becomes very important to measure the flange size to insure that the flange bearing area is well away from the hole area. Under nocircumstances should the bushing be so large as to contact the flange. The bushing length must be a minimum of one-half the wheel thickness, i.e. a%" length bushing is sufficientforagrinding wheel %" in thickness. Nesting two (2) or more plastic bushings to achieve the specified size is acceptable and safe practice, as long as the flange size guidelines are followed. (Machine speeds should also be checked against those shown on the wheel.) The following plastic bushings are now available and will be supplied as existing stocks of fibre bushings are exhausted. For the less common hole size diameters, plastic bushings are not available and fibre bushings &ill continue to be supplied. High Impact Plastic Bushings Fibre Bushing Availability Length/ Hole Length/ Hole O.D. Thickness (I.D.) %" 3/4" 'A'' %" 3/s", 5/8" '/2" 3/4" 'A" %" 3/s", 5/8" 5/B" 1'/a" 2" YE'' 1'/a" 2" 1" 1" 3/8", 70'' 1'A" 2'h" 1'/&" 1" ye, %" , %" 3/4" 1%" 2%" 1" 1" 78'' '/s " 1'/2" 2%" 1'A'' 11/4" '/a" 1" 13/4" 2'/2" 1" 13~" 21/2" 1i/4" 13~" 2%" 11/7r' 2" 2'/2" 1'A" 2" 2%" 1%" 2" 2%" 13/4" METRIC CONVERSIONS DECIMAL EQUlVALENTS Fraction Decimal I Fraction Decimal I Fraction Decimal This document is for viewing while on this website only. Copying, printing, saving or otherwise duplicating this document is prohibited and violates the Terms Of Use agreement. GENERAL INFORMATION DEFINlTlONS OF GRINDING TERMS Abrasive. A substance used for abrading - grinding, polishing, lap- Cam Wheel. An expression used to designate wheels for grinding ping - such as the natural materials, corundum, emery, diamond, cam shafts. etc., and the manufactured or electric furnace materials, aluminum Centerhole Lapping. The cleaning or lapping of centerholes with a oxide (A1203), silicon carbide (Sic), boron (B~c),diamond and CBN, cubic boron nitride. bonded abrasive wheel cemented onto a steel mandrel. Centerless Grinding. Grinding the outside or inside diameter of a Accuracy. Conformity in dimension to an exact standard. round piece not mounted on centers. ADALOX. Registered trade-mark of the Norton Coated Abrasive Divi- sion for aluminum oxide products used primarily in woodworking. Centers. Conical steel pins of a grinding machine upon which the work is centered and rotated during grinding. Alumina. Unfused aluminum oxide. Ceramics. Science and art of clay working and various related indus- Aluminum Oxide. An abrasive made by fusing the mineral Bauxite tries. The use of vitrified bonds brings abrasive wheel manufacturer (A'203). under this classification. ALUNDUM. Norton Company's registered trade-mark for aluminum Chatter Marks. Surface imperfections on the work being ground, oxide type abrasive. usually caused by vibrations between the wheel and the work. Arbor. The spindle of the grinding machine on which the wheel is Chuck. A device for holding grinding wheels of special shape or the mounted. workpiece being ground. Arbor Hole. The hole in the grinding wheel sized to fit the machine Coated Abrasives. Paper, cloth or fibre having abrasive grains arbor. bonded into the surface. Arc of Contact. That portion of the circumference of a grinding Collets. See Flanges. wheel touching the work being ground. Cone Wheel. A small wheel shaped like a bullet nose which is used Area of Contact. The total area of the grinding surface of a grinding for portable grinding. wheel in contact with the work being ground. Controlling Structure. The Norton process of manufacturing grind- Arkansas Stones. (Novaculite) A natural stone quarried in the Ozark ing wheels whereby the relationship between the abrasive and bond Mountains which produces the finest cutting edges. is definitely controlled. Balance (dynamic). A piece in static balance is in dynamic balance, Coolant. The liquid or solution used to cool the work and to prevent if upon rotating, there is no vibration nor "whip" action due to un- it from rusting. equal distribution of its weight throughout its length. Coping. Sawing stone with a grinding wheel. Balance (static). A grinding wheel is in static balance when, cen- Corner Wear. The tendency of a grinding wheel to wear on a corner tered on a frictionless horizontal arbor, it remains at rest in any so that it does not grind sharp corners without fillets. position. Corundum. A natural abrasive of the aluminum oxide type, of higher Balancing. Testing for balance.. .adding or subtracting weight to put purity than emery. a piece into either static or dynamic balance. Crank Wheel. An expression used to designate wheels for grinding Bauxite. A mineral ore high in aluminum oxide content from which crankshafts. ALUNDUM abrasive is manufactured. Critical Speed. Every spindle or mandrel with a wheel or point Bearing. Point of support. The part of a machine in which the spindle mounted on it has a certain critical speed at which vibration due to revolves. deflection or whip tends to become dxcessive. Bench Stand. An off-hand grinding machine with either one or two Crush Truing (or Crush Fosming).The process of using steel or tung- wheels mounted on a horizontal spindle, attached to a bench. sten carbide rolls to true or form grinding wheels to a wide variety of Blotter. A disc of compressible material, usually of blotting paper shapes. stock, used between a wheel and flanges when mounting. Crystalline. Made up of crystals. Bond. The material in a grinding wheel which holds the abrasive grains together. Crystallize. To convert into crystals. Boron Carbide. One of the hardest, wear-resistant, man-made tna- CRYSTOLON. Norton Company's registered trade-mark for silicon terials (B4C). .known by the Norton Company registered trade-mark carbide type abrasive. NORBIDE. Cup Wheel. A grinding wheel shaped like a cup or bowl. Brick. A block of bonded abrasive used for such purposes as rubbing Cutters. The part of a grinding wheel dresser that comes in con- down castings, scouring castings, general foundry and machine shop tact with the wheel and does the cutting. use, scouring chilled iron rolls, polishing marble, and work of like nature. Cutting-Off Wheel. A thin wheel (often reinforced), usually made with an organic bond, for cutting off. Brinnell Hardness Tester. A machine used for testing the indentation hardness of metals, except very hard ones like tool steels. Cutting Rate. The amount of material removed by a grinding wheel per unit of time. Burning (the work). A change in the work being ground caused by the heat of grinding, usually accompanied by a surface discoloration. Cutting Surface. The surface or face of the wheel against which the material is ground. Burring (pulpstones). Passing over the face of a pulpstone with a special tool to develop a pattern to provide a freer cutting surface. Cylinder Wheel. A grinding wheel of similar characteristics to a straight wheel, but with large hole size in proportion to its diameter Bushing. The material, usually cement, lead, babbitt, sulphur or alu- and usually of several inches in height. minum, which sometimes serves as a lining for the hole in a grinding wheel. (continued) This document is for viewing while on this website only. Copying, printing, saving or otherwise duplicating this document is prohibited and violates the Terms Of Use agreement. GENERAL INFORMATION DEFINITIONS OF GRINDING TERMS Cylindrical Grinding. Grinding the outside surface of a cylindrical Fluting. Grinding the grooves of a twist drill or tap. part mounted on centers. Freehand Grinding. Grinding by holding the work against the wheel Deburring. Act of removing burrs from metal. by hand, usually called offhand grinding. Diamond. A natural or manufactured abrasive. Gate. The part of a casting formed by the opening in the mold through which the metal is poured.