Replace the sharpening head when:
- Sharpening results drop clearly (you need many more passes and the blade still won’t improve)
- When you’ve reached roughly ~400 sessions under normal use.
A sharpening head is a sustainable product but performance will gradually decline with use.
Do NOT use carbide blades—this can wear the head down much faster.
If performance suddenly drops, first verify:
(1) blade material (no carbide)
(2) drill speed ≤1200 RPM
(3) light pressure
Note: If the results of sharpening still don't improve, it’s time to replace the head.