Grit size selection recommendations
When choosing grit size it is necessary to take into consideration following factors:
- the processing performance;
- the treated surface roughness;
- the type of finish (roughing, finishing).
For higher grinding performance when roughing it is necessary to use larger grit size.
The smaller the grit size, the lower the treated surface roughness is.
Approximate values of roughness depending on SHM grit size
| SHM grit size | Surface roughness, micron | |
|---|---|---|
| Ra | Rz | |
| 160/125 (151) | 1,4-1,6 | 5,6-8,0 |
| 125/100 (126) | 1,2-1,4 | 5,0-5,6 |
| 100/80 (107) | 1,0-1,2 | 4,0-5,0 |
| 80/63 (91) | 0,6-0,8 | 2,5-3,2 |
| 63/50 (64) | 0,4-0,6 | 1,6-2,5 |
| 50/40 (54) | 0,2-0,4 | 1,0-1,6 |
Approximate values of roughness depending on the type of bond
| Elbor wheel grit size | Roughness Ra, micron | |
|---|---|---|
| Vitrified bond | Resinoid bond | |
| 200/160 (B 213) | 1,20…0,63 | 0,80…0,50 |
| 125/100 (B 126) | 0,50…0,32 | 0,32…0,25 |
| 80/63 (B 91) | 0,32…0,16 | 0,20…0,16 |
| 50/40 (B 54) | 0,20…0,16 | 0,16…0,12 |