Machinery's Handbook, 31st Edition
902 Cutter Grinding the cutting edge is equal for all of the three types of land mentioned, it will be found that the land with the eccentric relief will drop away from the cutting edge a somewhat greater distance for a given distance around the land than will the others. This is evident from a study of Table 1, Indicator Drops for Checking the Radial Relief Angle on Peripheral Teeth . This feature is an advantage of the eccentric-type relief, which also produces an excellent finish. Table 1. Indicator Drops for Checking the Radial Relief Angle on Peripheral Teeth Cutter Diameter, Inch Rec. Range of Radial Relief Angles, Degrees Checking Distance, Inch Indicator Drops, Inches Rec. Max. Primary Land Width, Inch For Flat and Concave Relief For Eccentric Relief Min. Max. Min. Max.
20-25 16-20 15-19 13-17 12-16 11-15 10-14 10-14 10-13 10-13 10-13 9-12
.005 .005 .010 .010 .010 .010 .015 .015 .015 .015 .015 .020 .020 .020 .020 .020 .020 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030 .030
.0014 .0012 .0018 .0017 .0016 .0015 .0017 .0018 .0019 .0020 .0020 .0022 .0022 .0023 .0024 .0024 .0022 .0029 .0030 .0031 .0032 .0027 .0028 .0029 .0024 .0025 .0026 .0026 .0026 .0027 .0027 .0022 .0023 .0023 .0023 .0024 .0024 .0019 .0019 .0020 .0020 .0020 .0020
.0019 .0015 .0026 .0024 .0023 .0022 .0028 .0029 .0027 .0028 .0029 .0032 .0033 .0034 .0034 .0035 .0032 .0045 .0046 .0047 .0048 .0043 .0044 .0045 .0040 .0041 .0041 .0042 .0042 .0043 .0043 .0038 .0039 .0039 .0039 .0040 .0040 .0035 .0035 .0036 .0036 .0036 .0036
.0020 .0026 .0015 .0019 .0028 .0037 .0024 .0032 .0022 .0030 .0020 .0028 .0027 .0039 .0027 .0039 .0027 .0035 .0027 .0035 .0027 .0035 .0032 .0044 .0032 .0043 .0032 .0043 .0032 .0043 .0032 .0043 .0028 .0039 .0043 .0059 .0043 .0059 .0043 .0059 .0043 .0059 .0037 .0054 .0037 .0054 .0037 .0053 .0032 .0048 .0032 .0048 .0032 .0048 .0032 .0048 .0032 .0048 .0032 .0048 .0032 .0048 .0026 .0042 .0026 .0042 .0026 .0042 .0026 .0042 .0026 .0042 .0026 .0042 .0021 .0037 .0021 .0037 .0021 .0037 .0021 .0037 .0021 .0037 .0021 .0037
.007 .007 .015 .015 .015 .015 .020 .020 .020 .020 .020 .025 .025 .025 .025 .025 .025 .035 .035 .035 .035 .035 .035 .035 .035 .035 .035 .035 .035 .035 .035 .040 .040 .040 .040 .047 .047 .047 .047 .060 .060 .060 .060
1 ⁄ 16 3 ⁄ 32
1 ⁄ 8
5 ⁄ 32 3 ⁄ 16 7 ⁄ 32
1 ⁄ 4
9 ⁄ 32 5 ⁄ 16
11 ⁄ 32
3 ⁄ 8
13 ⁄ 32
9-12 9-12 9-12 9-12 8-11 8-11 8-11 8-11 8-11 7-10 7-10 7-10
7 ⁄ 16
15 ⁄ 32
1 ⁄ 2
9 ⁄ 16
5 ⁄ 8
11 ⁄ 16
3 ⁄ 4
13 ⁄ 16
7 ⁄ 8
15 ⁄ 16
1
1 1 ⁄ 8 1 1 ⁄ 4 1 3 ⁄ 8 1 1 ⁄ 2 1 5 ⁄ 8 1 3 ⁄ 4 1 7 ⁄ 8 2 1 ⁄ 4 2 1 ⁄ 2 2 3 ⁄ 4 2
6-9 6-9 6-9 6-9 6-9 6-9 6-9 5-8 5-8 5-8 5-8 5-8 5-8 4-7 4-7 4-7 4-7 4-7 4-7
3
3 1 ⁄ 2
4 5 6 7 8
10 12
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