Test report
| Item | Reference cermet grade | KT20 (Koves) |
|---|---|---|
| Workpiece and operation | ||
| Workpiece material | 20 carbon steel (C20 / AISI 1020) | |
| Cut type | Interrupted cut | |
| Operation | Facing | |
| Test machine | CNC horizontal lathe | |
| Coolant | Coolant (flood) | |
| Tools compared — only the grade was changed | ||
| Tool manufacturer | Japanese cermet maker | Koves (KOVES) |
| Insert model | WNMG080404 | WNMG080404 |
| Chipbreaker | TS | MT |
| Insert grade | Reference cermet grade | KT20 |
| Cutting conditions — identical for both tools | ||
| Cutting speed Vc | 72 m/min | |
| Table feed F | 200 mm/min | |
| Depth of cut ap | 0.5 mm | |
| Result | ||
| Tool life (parts/edge) | 90 | 140 |
| Outcome | Tool life 1.56× the reference grade (+56%) | |
Result and comparison basis
At identical cutting data the KT20 edge produced 140 parts per edge against 90 for the reference grade — 56% longer edge life with the same insert geometry and the same cycle. Only the grade changed; nothing in the process had to be adjusted.
Chipbreaker change: the reference tool ran TS, the Koves tool ran MT — both cut the same feature at the same parameters, so the difference is attributable to the grade and its edge preparation.
Comparison basis: the cermet grade the customer was running before the test, anonymised as “Reference cermet grade”. Insert model, chipbreaker and all cutting data are shown in full.
Related series
- WNMG Negative Cermet Turning Inserts — M Grade — 10 models
Comparative data from a Koves customer cutting test. Competitor grades are anonymised as reference grades. Results depend on workpiece, machine and setup; validate on your own production before adopting parameters.
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