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Grinding pressure
When using diamond and CBN tools, grinding pressure must be kept to a minimum, because the very high concentration creates relatively
large grinding forces. For this reason small areas of contact must be maintained. Furthermore, machines of rigid construction
will have a particularly positive effect on resulting ground finishes.
Cylindricity and flatness
Under normal circumstances, electroplated diamond and CBN tools cannot be trued. Cylindricity and flatness are therefore of great
importance. As a rule of thumb: maximum cylindricity and flatness tolerances must not exceed 5% of the particle size.
Grinding speeds
Optimum cutting speeds are dependent on a range of factors:
- Grinding medium (diamond, CBN)
- Type of grinding (cylindrical, flat, swing frame etc.)
- Coolant (oil, emulsion, dry grinding)
- Machine (rigidity, spindle speed)
- etc.
| Approximate values |
Wet grinding (m/s) |
Dry grinding (m/s) |
| Diamant |
15 - 20 |
10 - 15 |
| CBN |
30 - 160 |
15 - 20 |
|
| COOLANT |
Diamond tools
Although
diamond tools may be used in the dry condition on certain materials, a well-cooled tool will provide better cutting performance
and life from its plated coating at the same time as giving improved workpiece finish. Temperature sensitive materials such
as glass require an especially generous supply of coolant.
CBN tools
CBN tools are usually used in the wet condition, predominantly with the lubricant delivered by a high pressure flood system.
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