The demands expected of balls in the Bearing industry have become highly stringent in terms of quality in the recent years. The primary objective of a ball manufacturer is to constantly improve quality of the balls, in terms of sphericity (roundness) and surface finish, while reducing the overall manufacturing cost.
| Abrasive Used | CUMI Code | Grit | Diameter (mm) | Diameter (Inch) | Thickness (mm) | Thickness (Inch) | Hardness |
|---|---|---|---|---|---|---|---|
| Silicon carbide | C | 80-220 | 300-1000 | 12-40 | 40-140 | 1-1/2 to 5-1/2 | v,x,y,z |
| 240-600 | 300-660 | 12-24 | 40-70 | 1-1/2 to 4 |
| Operation | Ball Size (mm) | Ball Size (Inch) | Grit | Good | Better | Best |
|---|---|---|---|---|---|---|
| Rough | <=4mm | <=5/32" | 400,320 | C-VB944 | C-VB | - |
| >4mm- 11mm | >5/32"- 7/32" | 280,220,&180 | ||||
| 12mm-25mm | 15/32"- 31/32" | 180,150,&120 | ||||
| >25mm | >32/32" | 100& 80 |
