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Images of flank wears gradually emerge on HSS, HSS-TiN, and HSS-Co under a microscope magnification scale from 30× to150×.
| Tools | Cutting Speed (rpm) | Initial Condition | Final Condition (25th Hole) |
|---|---|---|---|
| HSS | 250 |
|
|
| 100 |
|
|
|
| HSS-TiN | 250 |
|
|
| 100 |
|
|
|
| HSS-Co | 250 |
|
|
| 100 |
|
|
