Machinery's Handbook, 31st Edition
INDEXABLE INSERTS 843 by a letter: A for straight shank with 0 ° side cutting edge angle; B, straight shank with 15 ° side cutting edge angle; C, straight-shank end cutting tool with 0 ° end cutting edge angle; D, straight shank with 45 ° side cutting edge angle; E, straight shank with 30 ° side cutting edge angle; F, offset shank with 0 ° end cutting edge angle; G, offset shank with 0 ° side cutting edge angle; J, offset shank with negative 3 ° side cutting edge angle; K, offset shank with 15 ° end cutting edge angle; L, offset shank with negative 5 ° side cutting edge angle and 5 ° end cutting edge angle; M, straight shank with 40 ° side cutting edge angle; N, straight shank with 27 ° side cutting edge angle; R, offset shank with 15 ° side cutting edge angle; S, offset shank with 45 ° side cutting edge angle; T, offset shank with 30 ° side cutting edge angle; U, offset shank with negative 3 ° end cutting edge angle; V, straight shank with 17 1 ⁄ 2 ° side cutting edge angle; W, offset shank with 30 ° end cutting edge angle; Y, offset shank with 5 ° end cutting edge angle. 4) Normal Clearances: The normal clearances of inserts are identified by letters: A, 3 ° ; B, 5 ° ; C, 7 ° ; D, 15 ° ; E, 20 ° ; F, 25 ° ; G, 30 ° ; N, 0 ° ; P, 11 ° . 5) Hand of tool: The hand of the tool is designated by a letter: R for right-hand; L, left- hand; and N, neutral, or either hand. 6) Tool Height for Rectangular Shank Cross Sections: The tool height for tool holders with a rectangular shank cross section and the height of cutting edge equal to shank height are given as two-digit numbers representing these values in millimeters. For example, a height of 32 mm would be encoded as 32; 8 mm would be encoded as 08, where the one- digit value is preceded by a zero. 7) Tool Width for Rectangular Shank Cross Sections: The tool width for tool holders with a rectangular shank cross section is given as a two-digit number representing this value in millimeters. For example, a width of 25 mm would be encoded as 25; 8 mm would be encoded as 08, where the one-digit value is preceded by a zero. 8) Tool Length: The tool length is designated by a letter: A, 32 mm; B, 40 mm; C, 50 mm; D, 60 mm; E, 70 mm; F, 80 mm; G, 90 mm; H, 100 mm; J, 110 mm; K, 125 mm; L, 140 mm; M, 150 mm; N, 160 mm; P, 170 mm; Q, 180 mm; R, 200 mm; S, 250 mm; T, 300 mm; U, 350 mm; V, 400 mm; W, 450 mm; X, special length to be specified; Y, 500 mm. 9) Indexable Insert Size: The size of indexable inserts is encoded as follows: For insert shapes C , D , E , H , M , O , P , R , S , T , V , the side length (the diameter for R inserts) in milli meters is used as a two-digit number, with decimals being disregarded. For example, the symbol for a side length of 16.5 mm is 16. For insert shapes A , B , K , L , the length of the main cutting edge or of the longer cutting edge in millimeters is encoded as a two-digit number, disregarding decimals. If the symbol obtained has only one digit, then it should be preceded by a zero. For example, the symbol for a main cutting edge of 19.5 mm is 19; for an edge of 9.5 mm, the symbol is 09. 10) Special Tolerances: Special tolerances are indicated by a letter: Q, back and end qualified tool; F, front and end qualified tool; B, back, front, and end qualified tool. A qual ified tool is one that has tolerances of ± 0.08 mm for dimensions F , G , and C . (See Table 2.) Table 2. Letter Symbols for Qualification of Tool Holders Position 10 ANSI B212.5-2002 Letter Symbol Q F B F ±0.08 C ±0.08 G ±0.08 G ±0.08 F ±0.08 C ±0.08
C ±0.08 Front and end qualified tool
Back and end qualified tool
Back, front, and end qualified tool
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