Machinery's Handbook, 31st Edition
968
Carbide Boring Tools Table 7. ANSI Solid Carbide Round Boring Tools — ANSI B212.1-2002 (R2007) Style SRC for 60 ° Boring Bar and Style SRE for 45 ° Boring Bar
6 ° ± 1 °
Tool Designation and Carbide Grade
G ± 1 °
F Ref
6 ° ± 1 °
0.010 R ± 0.003
D +0.0005 –0.0015
±0.005 to sharp corner D 2
B +0.000 –0.005
E± 1 °
C ± 1 64
H
6 ° ± 1 ° Along angle “ G ”
Shank Dimensions, Inches
Bor. Bar Angle from Axis, Deg.
End Cut. Edge Angle G , Deg.
Side Cut. Edge Angle E , Deg.
Dim. Over Flat B
Shoulder Angle F , Deg.
Nose Height H
Tool Designation
Dia. D
Length C
0.000 0.005 0.000 0.005
0.088 0.070 0.088 0.070 0.118 0.094 0.118 0.094 0.149 0.117 0.149 0.117 0.177 0.140 0.177 0.140 0.240 0.187 0.240 0.187 0.300 0.235 0.300 0.235
30 45 30 45 30 45 30 45 30 45 30 45
38 53 38 53 38 53 38 53 38 53 38 53
60 45 60 45 60 45 60 45 60 45 60 45
SRC-33 SRE-33 SRC-44 SRE-44 SRC-55 SRE-55 SRC-66 SRE-66 SRC-88 SRE-88
60 45 60 45 60 45 60 45 60 45 60 45
+ − ; + − ;
3 ⁄ 8 3 ⁄ 8 1 ⁄ 2 1 ⁄ 2 5 ⁄ 8 5 ⁄ 8 3 ⁄ 4 3 ⁄ 4
3 ⁄ 32 3 ⁄ 32
E
1 ⁄ 8 1 ⁄ 8
E
±0.005 ±0.005 ±0.005 ±0.005 ±0.005 ±0.005 ±0.005 ±0.005
5 ⁄ 32 5 ⁄ 32 3 ⁄ 16 3 ⁄ 16
1 1
1 ⁄ 4 1 ⁄ 4
SRC-1010 SRE-1010
1 1 ⁄ 4 1 1 ⁄ 4
5 ⁄ 16 5 ⁄ 16
Boring Machines, Origin.— The first boring machine was built by John Wilkinson in 1775. John Smeaton had built one in 1769 which had a large rotary head, with inserted cutters, carried on the end of a light, overhanging shaft. The cylinder to be bored was fed forward against the cutter on a rude carriage, running on a track laid in the floor. The cutter head followed the inaccuracies of the bore, doing little more than smooth out local roughness of the surface. Watt’s first steam cylinders were bored on this machine and he complained that one, 18 inches in diameter, was 3 ⁄ 8 inch out of true. Wilkinson thought of the expedient, which had escaped both Smeaton and Watt, of extending the boring-bar completely through the cylinder and giving it an out-board bearing, at the same time mak- ing it much larger and stiffer. With this machine, cylinders 57 inches in diameter were bored which were within 1 ⁄ 16 inch of true. Its importance can hardly be overestimated as it insured the commercial success of Watt’s steam engine, which, up to that time, had not passed the experimental stage.
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