Machinery's Handbook, 31st Edition
910
Reamers Fluting Cutters for Reamers
55
D
30
85
85
A
A
C
C
B
B
15
70
D
Radius between Cutting Faces
Radius between Cutting Faces
Fluting Cutter Dia.
Fluting Cutter Thickness
Hole Dia. in Cutter
Fluting Cutter Dia.
Fluting Cutter Thickness
Hole Dia. in Cutter
Reamer Dia.
Reamer Dia.
A
B
C
D
A
B
C
D
none a none a
1 1 1 1 1 1 1 1
1 3 ⁄ 4 1 3 ⁄ 4 1 3 ⁄ 4
1 1 ⁄ 4 1 1 ⁄ 2 1 3 ⁄ 4 2 1 ⁄ 4 2 1 ⁄ 2 2 3 ⁄ 4 2
2 1 ⁄ 4 2 1 ⁄ 4 2 1 ⁄ 4 2 1 ⁄ 2 2 1 ⁄ 2 2 1 ⁄ 2 2 1 ⁄ 2 2 1 ⁄ 2
3 ⁄ 16 3 ⁄ 16 3 ⁄ 16
3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4 3 ⁄ 4
9 ⁄ 16
1 ⁄ 8
1 ⁄ 16 1 ⁄ 16 5 ⁄ 64 5 ⁄ 64 5 ⁄ 64 3 ⁄ 16 3 ⁄ 16 3 ⁄ 16
5 ⁄ 8 5 ⁄ 8 3 ⁄ 4 3 ⁄ 4 7 ⁄ 8 7 ⁄ 8
3 ⁄ 16
1 ⁄ 64 1 ⁄ 64 1 ⁄ 32 1 ⁄ 32 3 ⁄ 64 3 ⁄ 64
1 ⁄ 4 3 ⁄ 8 1 ⁄ 2 5 ⁄ 8 3 ⁄ 4
2 2 2 2
1 ⁄ 4
5 ⁄ 16
3 ⁄ 8
7 ⁄ 16
1
1
3
1
2 1 ⁄ 4
1 ⁄ 2
a Sharp corner, no radius Rose Chucking Reamers.— The rose type of reamer is used for enlarging cored or other holes. The cutting edges at the end are ground to a 45-degree bevel. This type of reamer will remove considerable metal in one cut. The cylindrical part of the reamer has no cut- ting edges but merely grooves cut for the full length of the reamer body, providing a way for the chips to escape and a channel for lubricant to reach the cutting edges. There is no relief on the cylindrical surface of the body part, but it is slightly back-tapered so that the diameter at the point with the beveled cutting edges is slightly larger than the diameter farther back. The back-taper should not exceed 0.001 inch per inch (or mm/mm). This form of reamer usually produces holes slightly larger than its size; it is, therefore, always made from 0.005 to 0.010 inch (0.127-0.25 mm) smaller than its nominal size, so that it may be followed by a fluted reamer for finishing. The grooves on the cylindrical portion are cut by a convex cutter having a width equal to from one-fifth to one-fourth the diameter of the rose reamer itself. The depth of the groove should be from one-eighth to one-sixth the diameter of the reamer. The teeth at the end of the reamer are milled with a 75-degree angular cutter; the width of the land of the cutting edge should be about one-fifth the dis- tance from tooth to tooth. If an angular cutter is preferred to a convex cutter for milling the grooves on the cylindrical portion because of the higher cutting speed possible when milling, an 80-degree angular cutter slightly rounded at the point may be used. Cutters for Fluting Rose Chucking Reamers.— The cutters used for fluting rose chuck ing reamers on the end are 80-degree angular cutters for 1 ⁄ 4 - and 5 ⁄ 16 -inch diameter ream- ers; 75-degree angular cutters for 3 ⁄ 8 - and 7 ⁄ 16 -inch reamers; and 70-degree angular cutters for all larger sizes. The grooves on the cylindrical portion are milled with convex cutters of approximately the following sizes for given diameters of reamers: 5 ⁄ 32 -inch convex cutter for 1 ⁄ 2 -inch reamers; 5 ⁄ 16 -inch cutter for 1-inch reamers; 3 ⁄ 8 -inch cutter for 1 1 ⁄ 2 -inch reamers; 13 ⁄ 32 -inch cutters for 2-inch reamers; and 15 ⁄ 32 -inch cutters for 2 1 ⁄ 2 -inch reamers.
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