| n | Spindle speed, r/min |
| vw | Feed speed, mm/min |
| ap | Cutting depth, mm |
| r | Chip curl radius, mm |
| kt | Chip thickness deformation coefficient |
| kw | Chip width deformation coefficient |
| hc | Chip thickness, mm |
| ht | Theoretical instantaneous cutting thickness, mm |
| wc | Chip width, mm |
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