Effect of Grit Size on Surface Finish | US STANDARD MESH | Grain Sizes according to FEPA | ||
Diamond | CBN | |||
Rough Grinding | 60/70 | D 251 | B 251 | |
70/80 | D 213 | B 213 | ||
80/100 | D 181 | B 181 | ||
100/120 | D 151 | B 151 | ||
Medium Grinding | 120/140 | D 126 | B 126 | |
140/170 | D 107 | B 107 | ||
170/200 | D 91 | B 91 | ||
Finishing | 200/230 | D 76 | B 76 | |
230/270 | D 64 | B 64 | ||
270/325 | D 54 | B 54 | ||
325/400 | D 46 | B 46 | ||
Super Finishing | 400/500 | D 40 | B 40 | |
500/600 | D 30 | B 30 |
MICRON GRIT SIZE | |||
20-30 | D 25 | B 25 | |
15-25 | D 20 | B 20 | |
10-20 | D 15 | B 15 | |
8-12 | D 10 | B 10 | |
4-8 | D 7 | B 7 | |
2-4 | D 3 | B 3 | |
1-2 | D 1 | B 1 |
Concentration | Wt. of DIAMOND/CBN per CC of the Bondeding Section |
25 con. | 1.1 ct/cm2 |
50 con. | 2.2 ct/cm2 |
75 con. | 3.3 ct/cm2 |
100 con. | 4.4 ct/cm2 |
To completely order or specify a wheel the following has to be given. |
1. Type of the
wheel. 2. Grite size. 3. Concentration. |
Specify Dimension D, T, H, X, W/U |
For special profile wheels include wheel drawing. |
Example : |
Type 1A1 : Dia.-150 T-12 H-31.75 D/B 126 Con. 50 X 3 |
Type 4A2 : Dia.-150 W-6 H-31.75 D/B 126 Con. 50 X 1.5 |
DIAMOND WHEEL | CBN WHEEL |
|
|
MM | 8 m/s | 12 m/s | 16 m/s | 18 m/s | 20 m/s | 22 m/s | 26 m/s | 30 m/s |
10 | 15280 | 22930 | -- | -- | -- | -- | -- | -- |
15 | 10170 | 15300 | 20200 | 22900 | 25500 | -- | -- | -- |
20 | 7650 | 11500 | 15300 | 17200 | 19000 | 21200 | 25000 | 28750 |
25 | 6125 | 9180 | 12250 | 13775 | 15300 | 16850 | 19900 | 23000 |
50 | 3050 | 4580 | 6100 | 6880 | 7650 | 8400 | 9940 | 11450 |
75 | 2040 | 3060 | 4080 | 4580 | 5100 | 5600 | 6620 | 7650 |
90 | 1700 | 2550 | 3400 | 3820 | 4250 | 4670 | 5520 | 6370 |
100 | 1530 | 2290 | 3060 | 3440 | 3825 | 4200 | 4970 | 5730 |
125 | 1220 | 1830 | 2440 | 2750 | 3050 | 3355 | 3970 | 4600 |
150 | 1020 | 1530 | 2020 | 2290 | 2550 | 2800 | 3300 | 3800 |
200 | 765 | 1145 | 1530 | 1720 | 1910 | 2120 | 2490 | 2875 |
250 | 610 | 920 | 1225 | 1380 | 1525 | 1685 | 1990 | 2300 |
300 | 510 | 765 | 1020 | 1145 | 1275 | 1400 | 1660 | 1900 |
Grinding Process | Parameter | For Diamond | For CBN | |
Surface Grinding | Cutting Speed (m/s) | 23-26 | 23-28 | |
Depth of cut (m/s) | Roughing | 0.05 - 0.08 | 0.06 - 0.1 | |
Finishing | 0.002 - 0.02 | 0.005 - 0.03 | ||
External Cylindrical Grinding | Cutting Speed (m/s) | 23 - 26 | 23 - 28 | |
Work piece Speed (m/min) | 10 - 20 | 10 - 20 | ||
Depth of cut/in Feed (m/s) | Roughing | 0.03 - 0.05 | 0.04 - 0.08 | |
Finishing | 0.003 - 0.02 | 0.004 - 0.03 | ||
Internal Grinding | Cutting Speed (m/s) | 15 - 20 | 18 - 25 | |
Work piece Speed (m/min) | 25 - 30 | 30 - 35 | ||
Depth of cut/in Feed (m/s) | Roughing | 0.003 - 0.02 | 0.003 - 0.03 | |
Finishing | 0.003 - 0.008 | 0.003 - 0.05 | ||
Tool & Cutter Grinding | Cutting Speed (m/s) | 15 - 18 | 18 - 30 | |
Table Speed (m/s) | 2 - 3 | 3 - 5 | ||
Work piece Speed (m/min) | 25 - 30 | 30 - 35 | ||
Depth of cut/in Feed (m/s) | 0.02 - 0.3 | 0.03 - 0.05 |