Selecting Tolerances
Tolerances will govern the method of manufacturing. When the tolerances are reduced, the cost of manufacturing rises very rapidly. Specify as generous a tolerance as possible without interfering with the function of the part.
| IT Grades | ||||||||
|---|---|---|---|---|---|---|---|---|
| Machining Operation | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Lapping & Honing | ||||||||
| Cylindrical Grinding | ||||||||
| Surface Grinding | ||||||||
| Diamond Turning | ||||||||
| Diamond Boring | ||||||||
| Broaching | ||||||||
| Reaming | ||||||||
| Turning | ||||||||
| Boring | ||||||||
| Milling | ||||||||
| Planing & Shaping | ||||||||
| Drilling | ||||||||
| Punching | ||||||||
| Die Casting | ||||||||
Choosing the most appropriate tolerance depends on many factors such as;
- length of engagement
- bearing load
- speed
- lubrication
- temperature
- humidity
- material
- experience also plays a significant role.