Convex Edge (ハマグリ刃 - Hamaguri-ba)
Convex Edge (ハマグリ刃 - Hamaguri-ba)
Quick look
- Glide: Hollow-ground convex faces keep friction minimal, so dry sections slide without snagging.1,2
- Edge support: A narrow hone line along the hollow protects the razor-fine lip from collapsing.2,3
- Care level: Sensitive geometry chips if dropped and must be serviced by hamaguri-trained sharpeners.1,2
Why stylists pick it
Convex blades are the benchmark for buttery, quiet cutting. The continuous curve lets hair travel over the blade instead of pushing forward, which gives stylists the confidence to tackle dry detailing, channel work, and precision point cutting in a single pass.1,2 Because the interior is hollow ground, the blades meet with a gentle kiss, reducing fatigue on marathon texture sessions.2,3
Technique map
- Dry slide and channel cuts where zero drag keeps sections intact.1,2
- Precision point detailing on fringes and perimeters that need soft definition.1,2
- Texturising sweeps and feathering on fine to medium hair without leaving cut marks.2,3
Usage notes
- Keep tension just tight enough for a 45° drop test; too loose creates blade chatter on the hollow.2
- Work with light closing pressure and let the arc do the slicing - forcing the stroke dulls the edge.1
- Store the shear closed in a padded case and wipe between clients to protect the polished faces.1,2
Maintenance
- Schedule professional hamaguri sharpening and confirm the technician protects the hone line.1,2
- Request a hollow re-polish only when needed; aggressive grinding destroys the geometry.2,3
- Oil the pivot daily and brush away debris so the hollow stays clean and the close remains silent.2
| Related edges: Semi-Convex Edge | Clam-Shaped Edge | 3D Convex Edge |