American National Standards Institute (ANSI) Standards: ANSI B74.12-1992: Specifications for Size of Abrasive Grain-Grinding Wheels, Polishing and General Industrial Uses. ANSI B74.13-1990: Markings for Identifying Grinding Wheels and Other Bonded Abrasives. ANSI B74.2-1992: Specifications for Shapes and Sizes of Grinding Wheels, and for Shapes, Sizes and Identification of Mounted Wheels ANSI B74.21-1986 (R1992): Vitrified Grinding Wheels, Fatigue Proof Test Procedure.STRAIGHT WHEELGRINDING CONEGRINDING CONE

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Grinding wheel specification and indication method

The grinding wheel comes in an extraordinary variety of models depending on application.This method for international unification of grinding wheel varieties took effect in 1965 as the ISO and JIS(Japan), ANSI(USA) and DIN(Germany), which are based on this method.

We can express the unity of specification in this variety as an example.

1 A 305X25X127.00 H 60 K 8 V 8J 20001Shape type

ARim type

305X25X127.00Outside diameter x Thickness x Hole diameter (DxTxH)

HKind of abrasive

60Grain size

KGrade

8Structure

VKind of bond

8JSubdivision symbol of bond

2000Max speed in M/Min.

Grinding wheel Structure of grinding wheel Abrasive grain (artificial abrasice) Grain size Grade Structure Bond Bond subdivision symbols Grinding wheel specification and indication method Grinding wheel's shapes and sizeStructure of grinding wheel

The grinding wheel is composed of three main elements (abrasive grain, bond and pores)

Abrasive grain are edges that shave a work piece, a bond supports the edge, while pores are gaps necessary for removing chips.

Since the abrasive grain is harder than a work piece, it can shave hard materials such as quenched steel.

The abrasive grain always has edges with "negative rake angles". As the depth of cut is shallow, the finished work piece can be fine and attractive.

Multiple edges and high grinding speed enable excellent efficiency even though the depth of cut is shallow.

If an edge becomes round and worn through use, the abrasive grain will drop out and a new edge will appear. This is called "self-sharpening" of abrasive grain.

The quantity of heat produced using the grinding wheel is larger than that produced in cutting. Since the work piece absorbs most of the heat produced, a large quantity of grinding fluid is necessary for mechanical grinding.

Abrasive MaterialsSilicon carbide, Aluminium oxide, Ceramic, Zirconia, Diamond, Cubic Boron Nitride, Tungsten Carbide and GlassNote: Glass paper and Sand paper are sameTypes of Grain Size8, 10, 12, 14, 16, 20 and 24: Coarse30, 36, 46, 54 and 60: Medium70, 80, 90, 100, 120, 150 and 180: Fine220, 240, 280, 320, 360, 400, 500, 600, 700, 800, 1000 and 1200: Very FineGrade

A "grade" does not refer to the hardness of abrasive grain or bond itself. It indicated the binding degree of weakness or strength also known as "hardness") of the bond, which sustains abrasive grains.

Binding degree increases in alphabetical order according to the given grade. A grade is a depth expressed alphabetically, when applying a fixed load and rotation to a carbide bit of uniform shape on the flat surface of the grinding wheel.

It is most important in selecting a grinding wheel to adjust the grade by taking into consideration the hardness of the work piece to be ground, peripheral wheel speed and other operating conditions.Super Soft: A, B, C, D, E, F and GSoft: H, I, J and KMedium: L, M, N and OHard: P, Q, R and SSuper Hard: T, U, V, W, X, Y and ZBondA bond is a material which binds abrasive grainsVitrified, Resin, Rubber and MagnesiaCone Size: Dia x Len x Arbor size