Machinery's Handbook, 31st Edition
DIAMOND WHEELS
1307
Table 3. Designations for Location of Diamond Section on Diamond Wheel ANSI B74.3-2003 (R2014) Table 3. (Continued) Designations for Location of Diamond
Designation No. and Location
Description
Illustration
9 — Corner
Designates a location which would commonly be considered to be on the periphery except that the diamond section shall be on the corner but shall not extend to the other corner. Designates a location of the diamond abrasive section on the inner annular surface of the wheel.
10 — Annular
Composition of Diamond and Cubic Boron Nitride Wheels.— According to American National Standard ANSI B74.13-2016, a series of symbols is used to designate the compo sition of these wheels. An example is shown below.
Bond Modifi- cation
Manufacturer’s Identification Symbol
12O Grain Size
Bond Type
Depth of Abrasive
Prefix
Abrasive
Grade
Concentration
M D
R
B
56
1 8
IOO
Fig. 2. Designation Symbols for Composition of Diamond and Cubic Boron Nitride Wheels The meaning of each symbol is indicated by the following list: 1) Prefix: The prefix is a manufacturer’s symbol indicating the exact kind of abrasive. Its use is optional. 2) Abrasive Type: The letter (B) is used for cubic boron nitride and (D) for diamond. 3) Grain Size: The grain sizes commonly used and varying from coarse to very fine are indicated by the following numbers: 8, 10, 12, 14, 16, 20, 24, 30, 36, 46, 54, 60, 70, 80, 90, 100, 120, 150, 180, and 220. The following additional sizes are used occasionally: 240, 280, 320, 400, 500, and 600. The wheel manufacturer may add to the regular grain number an additional symbol to indicate a special grain combination. 4) Grade: Grades are indicated by letters of the alphabet from A to Z in all bonds or pro cesses. Wheel grades from A to Z range from soft to hard. 5) Concentration: The concentration symbol is a manufacturer’s designation. It may be a number or a symbol. 6) Bond: Bonds are indicated by the following letters: B, resinoid; V, vitrified; M, metal. 7) Bond Modification: Within each bond type a manufacturer may have modifications to tailor the bond to a specific application. These modifications may be identified by either letters or numbers. 8) Abrasive Depth: Abrasive section depth, in inches or millimeters (inches illustrated), is indicated by a number or letter which is the amount of total dimensional wear a user may expect from the abrasive portion of the product. Most diamond and CBN wheels are made with a depth of coating on the order of 1 ∕ 16 in., 1 ∕ 8 in., (1.6 mm, 3.2 mm) or more as specified. In some cases the diamond is applied in thinner layers, as thin as one thickness of diamond grains. The L is included in the marking system to identify a layered type product. 9) Manufacturer’s Identification Symbol: The use of this symbol is optional.
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