Hamaguri Grind: Process & Service
Edge typesKeep the edge term attached to geometry and service
An edge label becomes useful only when its maker wording, host blade, finish, and service route are known. Apply to Hamaguri Grind: Process & Service
- 01 Record the term Preserve the exact maker and model wording.
- 02 Locate the edge Identify the blade half, section, line, and any serration.
- 03 Trace its condition Keep sharpening, damage, coating, and inspection history.
- 04 Choose service Ask how the provider will preserve the original geometry.
Do not inferPolish, shine, feel, or a marketing label cannot diagnose an edge geometry or authorise a sharpening method.
Hamaguri can cross section and grind vocabulary
Preserve the maker's original term and stated axis instead of turning one translated word into a universal service recipe.
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01 Side / plan view Open field
Blade line
Hamaguri wording does not define the longitudinal blade line.
Leave openHeel-to-tip path, width, curve, and transition remain open.
This route does not settle the field; record it separately.
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02 End-on slice Maker-local
Cross-section
Some sources use the term for a rounded, shell-like supporting profile.
Leave openSlice location, radii, symmetry, inner relief, and partner blade remain open.
Keep the term attached to the maker, model, language, and dated source.
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03 Magnified working edge Maker-local
Edge / grind
Some sources pair hamaguri with rounded convex outer-grind wording.
Leave openExact curvature, edge finish, process stages, and service method remain model-specific.
Keep the term attached to the maker, model, language, and dated source.
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04 Declared axis + view Unresolved
Spatial curve
The source must declare whether its drawing is end-on, outer-face, or another view.
Leave openAxis, datum, scale, measured zone, and blade half remain open.
The available label does not reveal the geometry or measurement axis.
Description
An evidence check for what hamaguri or grind wording does—and does not—establish about manufacturing and service. Exact curvature, finish, process, and repair method remain model-specific.
Hamaguri-ba is useful Japanese maker vocabulary for a rounded or clam-shell-like blade or edge profile. It is not a dimensional specification. Identify the original maker term, exact model, outer surface, inner relief, edge finish, blade pairing, and service guidance before translating the label into a comparison or maintenance decision.
This entry focuses on manufacturing and service claims attached to the word “grind.” For translation, maker vocabulary, and the broad profile concept, start with Hamaguri-ba terminology.
Read the label, keep the unknowns
Hamaguri / convex: the useful boundary
- The label supports
- The maker is describing a rounded or clam-shell-like blade or edge profile.
- It does not establish
- A fixed radius, angle, stage count, abrasive sequence, inner relief, edge finish, cutting result, service interval, or country-specific method.
- Verify next
- Original maker wording, exact model, which surface the term describes, published drawing or datum, blade pairing, condition, and current service guidance.
A bounded term, not a universal recipe
Hamaguri-ba (蛤刃) is Japanese maker terminology for a rounded or convex blade or edge profile. The clam-shell analogy is useful for recognising the broad idea. It is not a technical drawing.
Current primary sources do not establish one cross-brand stage count, radius, angle transition, inner-face construction, or finishing sequence. A polished product photograph cannot reveal all of those features either. Use an end-on maker diagram or an exact specification when dimensions matter.
What current makers show
- HIKARI uses hamaguri and convex wording together for its own handmade construction. Its page explains the design in HIKARI terms; it does not publish a universal geometry standard.
- Naruto Scissors uses clam-blade vocabulary alongside a different sword-shaped form. That contrast documents Naruto’s catalogue language rather than an industry-wide ranking.
- KASHO describes convex outer surfaces and hollow-ground inner surfaces on named models. This proves that those axes can be specified separately; it does not make that inner construction part of every hamaguri definition.
These examples support an overlapping rounded-profile concept. They also show why the original maker term and exact model matter more than a translated label in a retailer listing.
What the label cannot settle
Hamaguri wording alone does not establish cutting force, feel, edge life, technique suitability, material quality, price, or user level. Those outcomes depend on the whole shear: blade line and width, section, outer grind, edge finish, inner relief, pairing, tension, set, condition, material, task, and operator.
The term also describes a different axis from the blade’s plan-view line. A straight, willow, or other blade line may carry its own section and edge description. Do not collapse all of those fields into “hamaguri.”
Service boundary
HIKARI warns that unsuitable polishing can destroy the rounded profile on its shears. That is direct, maker-specific service evidence. It does not prove that every maker uses the same equipment, abrasive, sequence, technician title, or repair limit.
Before service, record the maker, exact model, size, hand, published construction, photographs, current symptoms, and prior work. Ask the provider how the existing profile, inner face, blade relationship, and finish will be identified and preserved. If the model documentation is missing, record the uncertainty instead of assigning a process from the hamaguri name alone.
Related pages: Convex Edge · Semi-Convex Edge · Beveled Edge · Hamaguri vs. Konvex Service Language
Sources Reviewed
4 scoped sources behind this entry- Primary Hikari Scissors — Official (HIKARI's maker-specific use of convex and hamaguri terminology)
- Primary Hikari Scissors — Official (HIKARI-specific warning about preserving its rounded profile)
- Direct Naruto Scissors English overview (A second maker's clam-blade vocabulary, kept at maker scope)
- Direct KASHO Green Series (Exact-model example separating convex outer surfaces from hollow-ground inner surfaces)
Frequently Asked Questions
4 answers you can open one at a timeWhat does hamaguri-ba mean on a hair shear?
It is Japanese maker vocabulary for a rounded or convex blade or edge profile, named by reference to a clam shell. The term does not define one dimensional cross-section.
Does hamaguri specify a fixed number of grinding stages, angle, or radius?
No primary maker consensus was found for any universal recipe. Curvature, transition, inner relief, edge finish, blade pairing, and manufacturing process must be verified for the exact maker and model.
Are hamaguri and convex interchangeable?
They overlap in current maker usage, including HIKARI’s description of its own construction. Do not assume that two makers using either word publish or produce identical geometry.
Does every hamaguri shear require the same service method?
No. HIKARI warns that unsuitable polishing can destroy the profile on HIKARI shears. That supports preserving HIKARI geometry according to HIKARI guidance, not one stone system, provider title, or country rule for every shear.
Comments & questions
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