Machinery's Handbook, 31st Edition
Reamers
911
Dimensions of Formed Reamer Fluting Cutters
A
B
C
C
The making and maintenance of cutters of the formed type involve greater expense than the use of angular cutters, dimensions of which are given on the previous page; but the form of flute produced by the formed type of cutter is preferred by many reamer users. The claims made for the formed type of flute are that the chips can be more readily removed from the reamer and that the reamer has greater strength and is less likely to crack or spring out of shape in hardening.
G
H
E
F
6
No. of Cutter Teeth
No. of Teeth in Reamer
Cutter Dia. D
Cutter Width A
Hole Dia. B
Bearing Width C
Bevel Length E
Tooth Depth H 0.21
Reamer Size 1 ⁄ 8 - 3 ⁄ 16 1 ⁄ 4 - 5 ⁄ 16 3 ⁄ 8 - 7 ⁄ 16 1 ⁄ 2 - 11 ⁄ 16 1 1 ⁄ 16 -1 1 ⁄ 2 1 9 ⁄ 16 -2 1 ⁄ 8 3 ⁄ 4 -1
Radius F
Radius F
6 6 6
… … 1 ⁄ 8 1 ⁄ 8
0.125 0.016 0.152 0.022 0.178 0.029 0.205 0.036 0.232 0.042 0.258 0.049 0.285 0.056 0.312 0.062
14 13 12 12 12 11 11 10
1 3 ⁄ 4 1 3 ⁄ 4 1 7 ⁄ 8 2 1 ⁄ 8 2 1 ⁄ 4 2 3 ⁄ 8 2 5 ⁄ 8 2
3 ⁄ 16
7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8 7 ⁄ 8
7 ⁄ 32 9 ⁄ 32
0.25 0.28 0.30 0.32 0.38 0.40 0.44
1 ⁄ 4 3 ⁄ 8
1 ⁄ 2
6-8
7 ⁄ 16
9 ⁄ 16
8
1 ⁄ 2
5 ⁄ 32 5 ⁄ 32 3 ⁄ 16 3 ⁄ 16
11 ⁄ 16
10 12 14
9 ⁄ 16
3 ⁄ 4
5 ⁄ 8
27 ⁄ 32
2 1 ⁄ 4 -3
11 ⁄ 16
7 ⁄ 8
The smaller sizes of reamers, from 1 ⁄ 4 to 3 ⁄ double-angle reamer fluting cutters having a radius of 1 ⁄
8 inch in diameter, are often milled, with regular
64 inch for
1 ⁄ 4 -inch reamer, and
1 ⁄ 8 -inch sizes. Reamer Terms and Definitions.— Reamer: A rotary cutting tool with one or more cut ting elements used for enlarging to size and contour a previously formed hole. Its principal support during the cutting action is obtained from the workpiece. (See Fig. 1.) Actual Size: The actual measured diameter of a reamer, usually slightly larger than the nominal size to allow for wear. Angle of Taper: The included angle of taper on a taper tool or taper shank. Arbor Hole: The central mounting hole in a shell reamer. Axis: The imaginary straight line that forms the longitudinal centerline of a reamer, usually established by rotating the reamer between centers. Back Taper: A slight decrease in diameter, from front to back, in the flute length of reamers. 32 inch for 5 ⁄ 16 - and 3 ⁄ Bevel: An unrelieved angular surface of revolution (not to be confused with chamfer). Body: The fluted full-diameter portion of a reamer, inclusive of the chamfer, starting taper, and bevel. Chamfer: The angular cutting portion at the entering end of a reamer (see also Secondary Chamfer ).
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