Machinery's Handbook, 31st Edition
928
Reamers American National Standard Morse Taper Finishing Reamers ANSI/ASME B94.2-1995 (R2015)
Chamber Optional
D
B
C
A
B
A
Straight Flutes and Squared Shank
Small End Dia. (Ref.) 0.2503 0.3674 0.5696
Large End Dia. (Ref.) 0.3674 0.5170 0.7444
Length Overall A
Flute Length B
Square Length C
Shank Dia. D
Taper No. a
Square Size 0.235 0.330 0.470 0.655 0.845 1.125
0 1 2 3 4 5
2 1 ⁄ 4
3 3 ⁄ 4
5 ⁄ 16 7 ⁄ 16
5 ⁄ 16 7 ⁄ 16
5 6
3
3 1 ⁄ 2 4 1 ⁄ 4 5 1 ⁄ 4 6 1 ⁄ 4
5 ⁄ 8 7 ⁄ 8
5 ⁄ 8 7 ⁄ 8
0.7748 1.0167 1.4717
0.9881 1.2893 1.8005
7 1 ⁄ 4 8 1 ⁄ 2 9 3 ⁄ 4
1
1 1 ⁄ 8 1 1 ⁄ 2
1 1 ⁄ 8
Straight and Spiral Flutes and Taper Shank
Taper Shank No. a
Length Overall A
Flute Length B
Large End Dia. (Ref.) 0.3674 0.5170 0.7444
Small End Dia. (Ref.) 0.2503 0.3674 0.5696
Taper No. a
Squared and Taper Shank Number of Flutes
0 1 2 3 4 5
0 1 2 3 4 5
4 to 6 incl. 6 to 8 incl. 6 to 8 incl. 8 to 10 incl. 8 to 10 incl. 10 to 12 incl.
2 1 ⁄ 4
5 11 ⁄ 32 6 5 ⁄ 16
3
3 1 ⁄ 2 4 1 ⁄ 4 5 1 ⁄ 4 6 1 ⁄ 4
7 3 ⁄ 8 8 7 ⁄ 8
0.7748 1.0167 1.4717
0.9881 1.2893 1.8005
10 7 ⁄ 8 13 1 ⁄ 8
a Morse. For amount of taper see Table on page 1013 . All dimension are given in inches. Material is high-speed steel. The chamfer on the cutting end of the reamer is optional. Squared shank reamers are standard with straight flutes. Tapered shank reamers are standard with straight or spiral flutes. Spiral flute reamers are standard with left-hand spiral flutes. Tolerances: On overall length A and flute length B , in taper numbers 0 to 3, incl., ± 1 ⁄ 16 inch, in taper numbers 4 and 5, ± 3 ⁄ 32 inch. On length of square C , in taper numbers 0 to 3, incl., ± 1 ⁄ 32 inch; in taper numbers 4 and 5, ± 1 ⁄ 16 inch. On shank diameter D , - .0005 to - .002 inch. On size of square, in taper numbers 0 and 1, - .004 inch; in taper numbers 2 and 3, - .006 inch; in taper numbers 4 and 5, - .008 inch. Center Reamers.— A “center reamer” is a reamer the teeth of which meet in a point. By their use, small conical holes may be reamed in the ends of parts to be machined as on lathe centers. When large holes—usually cored—must be center-reamed, a large reamer is ordinarily used in which the teeth do not meet in a point, the reamer forming the frustum of a cone. Center reamers for such work are called “bull” or “pipe” center reamers. Bull Center Reamer: A conical reamer used for reaming the ends of large holes—usually cored—so that they will fit on a lathe center. The cutting part of the reamer is generally in the shape of a frustum of a cone. It is also known as a pipe center reamer.
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