Machinery's Handbook, 31st Edition
Cutter Grinding 903 The setup for grinding an eccentric relief is shown in Fig. 1. In this setup, the point of contact between the cutter and the tooth rest must be in the same plane as the centers, or axes, of the grinding wheel and the cutter. A wide face is used on the grinding wheel, which is trued and dressed at an angle with respect to the axis of the cutter. An alternate method is to tilt the wheel at this angle. Then as the cutter is traversed and rotated past the grinding wheel while in contact with the tooth rest, an eccentric relief will be generated by the angular face of the wheel. This type of relief can only be ground on the peripheral teeth on milling cutters having helical flutes because the combination of the angular wheel face and the twisting motion of the cutter is required to generate the eccentric relief. Therefore, an eccentric relief cannot be ground on the peripheral teeth of straight-fluted cutters. Table 2 is a table of wheel angles for grinding an eccentric relief for different combina tions of relief angles and helix angles. When angles are required that cannot be found in this table, the wheel angle, W , can be calculated by using the following formula, in which R is the radial relief angle and H is the helix angle of the flutes on the cutter. tan W tan R tan H # = Table 2. Grinding Wheel Angles for Grinding Eccentric-Type Radial Relief Angle
Helix Angle of Cutter Flutes, H , Degrees
Radial Relief Angle, R , Degrees
12
18
20
30
40
45
50
52
Wheel Angle, W , Degrees
1 2 3 4 5 6 7 8 9
0 ° 13 ′ 0 ° 26 ′ 0 ° 38 ′ 0 ° 51 ′ 1 ° 04 ′ 1 ° 17 ′ 1 ° 30 ′ 1 ° 43 ′ 1 ° 56 ′ 2 ° 09 ′ 2 ° 22 ′ 2 ° 35 ′ 2 ° 49 ′ 3 ° 02 ′ 3 ° 16 ′ 3 ° 29 ′ 3 ° 43 ′ 3 ° 57 ′ 4 ° 11 ′ 4 ° 25 ′ 4 ° 40 ′ 4 ° 55 ′ 5 ° 09 ′ 5 ° 24 ′ 5 ° 40 ′
0 ° 19 ′ 0 ° 39 ′ 0 ° 59 ′ 1 ° 18 ′ 1 ° 38 ′ 1 ° 57 ′ 2 ° 17 ′ 2 ° 37 ′ 2 ° 57 ′ 3 ° 17 ′ 3 ° 37 ′ 3 ° 57 ′ 4 ° 17 ′ 4 ° 38 ′ 4 ° 59 ′ 5 ° 19 ′ 5 ° 40 ′ 6 ° 02 ′ 6 ° 23 ′ 6 ° 45 ′ 7 ° 07 ′ 7 ° 29 ′ 7 ° 51 ′ 8 ° 14 ′ 8 ° 37 ′
0 ° 22 ′ 0 ° 44 ′ 1 ° 06 ′ 1 ° 27 ′ 1 ° 49 ′ 2 ° 11 ′ 2 ° 34 ′ 2 ° 56 ′ 3 ° 18 ′ 3 ° 40 ′ 4 ° 03 ′ 4 ° 25 ′ 4 ° 48 ′ 5 ° 11 ′ 5 ° 34 ′ 5 ° 57 ′ 6 ° 21 ′ 6 ° 45 ′ 7 ° 09 ′ 7 ° 33 ′ 7 ° 57 ′ 8 ° 22 ′ 8 ° 47 ′ 9 ° 12 ′ 9 ° 38 ′
0 ° 35 ′ 1 ° 09 ′ 1 ° 44 ′ 2 ° 19 ′ 2 ° 53 ′ 3 ° 28 ′ 4 ° 03 ′ 4 ° 38 ′ 5 ° 13 ′ 5 ° 49 ′ 6 ° 24 ′ 7 ° 00 ′ 7 ° 36 ′ 8 ° 11 ′
0 ° 50 ′ 1 ° 41 ′ 2 ° 31 ′ 3 ° 21 ′ 4 ° 12 ′ 5 ° 02 ′ 5 ° 53 ′ 6 ° 44 ′ 7 ° 34 ′ 8 ° 25 ′
1 ° 00 ′ 2 ° 00 ′ 3 ° 00 ′ 4 ° 00 ′ 5 ° 00 ′ 6 ° 00 ′ 7 ° 00 ′
1 ° 12 ′ 2 ° 23 ′ 3 ° 34 ′ 4 ° 46 ′ 5 ° 57 ′ 7 ° 08 ′ 8 ° 19 ′
1 ° 17 ′ 2 ° 34 ′ 3 ° 50 ′ 5 ° 07 ′ 6 ° 23 ′ 7 ° 40 ′ 8 ° 56 ′
8 ° 00 ′ 9 ° 00 ′ 10 ° 00 ′ 11 ° 00 ′ 12 ° 00 ′ 13 ° 00 ′ 14 ° 00 ′ 15 ° 00 ′ 16 ° 00 ′ 17 ° 00 ′ 18 ° 00 ′ 19 ° 00 ′ 20 ° 00 ′ 21 ° 00 ′ 22 ° 00 ′ 23 ° 00 ′ 24 ° 00 ′ 25 ° 00 ′
9 ° 30 ′ 10 ° 41 ′ 11 ° 52 ′ 13 ° 03 ′ 14 ° 13 ′ 15 ° 23 ′ 16 ° 33 ′ 17 ° 43 ′ 18 ° 52 ′ 20 ° 01 ′ 21 ° 10 ′ 22 ° 19 ′ 23 ° 27 ′ 24 ° 35 ′ 25 ° 43 ′ 26 ° 50 ′ 27 ° 57 ′ 29 ° 04 ′
10 ° 12 ′ 11 ° 28 ′ 12 ° 43 ′ 13 ° 58 ′ 15 ° 13 ′ 16 ° 28 ′ 17 ° 42 ′ 18 ° 56 ′ 20 ° 09 ′ 21 ° 22 ′ 22 ° 35 ′ 23 ° 47 ′ 24 ° 59 ′ 26 ° 10 ′ 27 ° 21 ′ 28 ° 31 ′ 29 ° 41 ′ 30 ° 50 ′
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
9 ° 16 ′ 10 ° 07 ′ 10 ° 58 ′ 11 ° 49 ′ 12 ° 40 ′ 13 ° 32 ′ 14 ° 23 ′ 15 ° 15 ′ 16 ° 07 ′ 16 ° 59 ′ 17 ° 51 ′ 18 ° 44 ′ 19 ° 36 ′ 20 ° 29 ′ 21 ° 22 ′
8 ° 48 ′ 9 ° 24 ′ 10 ° 01 ′ 10 ° 37 ′ 11 ° 15 ′ 11 ° 52 ′ 12 ° 30 ′ 13 ° 08 ′ 13 ° 46 ′ 14 ° 25 ′ 15 ° 04 ′
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online