2.Selection of Grit Size DIAMOND / CBN :
| 60 - 80 | 120 - 140 | 200 - 230 | 325 - 400 |
| 80 - 100 | 140 - 170 | 230 - 270 | 400 - 500 |
| 100 - 120 | 170 - 200 | 270 - 325 | |
| Finish in Micron : 1.0 0.80 0.60 0.50 0.40 0.30 0.25 0.20 |
3. Grade :
| L = Soft | N = Medium | R = hard |
4. Bond :
| BG = General Purpose |
| BF = Finer Finish |
| BD = Mirror finish |
5. Concentration :
As a basic value for DIAMOND/CBN concentration in grinding wheels, 100 is equivalent to 4.4 carats per cubic centimeters (0.88 gm/cm³) Other concentrations are worked out prorata from this figure and are given below. |
| Concentration | Wt. of DIAMOND/CBN per CC of the Bonding 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 |
6. How to Order a Full Wheel :
| To completely order or specify a wheel the following has to be given. |
| 1. Type of the wheel. 2. Grite size. 3. Grade. 4. Concentration. 5. Bond. |
| Specify Dimension D, T, H, X, W/U |
| For special profile wheels include wheel drawing. |
| Example : 1A1 150 x 12 x 31.75 D 150 R 75 BS 1.5 |
7. Grind Application :
| DIAMOND WHEEL | CBN WHEEL |
- Tungsten Carbide
- Tungsten Carbide &
Steel comp. materials - Ceramics-Oxides/
Mixed Carbides - Ferrites, Graphite
- Glass-Sheet glass, Optical glass
- Grey Cast Iron
- Other non-ferrous non-Metallic materials
| - High Speed steel-HSS
- Die steels
- Super Alloys
- Cast Iron
- Tool Steels (Un hardened)
- Other hardened ferrous materials
|
8. Wheel Peripheral Speed : (Wheel speed meter per second M/S )
| 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 |
9. Grinding Parameters : (For Resin Bond DIAMOND / CBN Wheels)
| Grinding Process | Parameter | For Diamon | 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 |
