Chokuba Straight Blade Line
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 Chokuba Straight Blade Line
- 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.
Chokuba belongs on the blade-line axis
The supported cue is a comparatively straight heel-to-tip path within a maker's own range—not a grind or absolute radius.
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01 Side / plan view Maker-local
Blade line
A comparatively straight plan-view line is the route-specific cue.
Leave openMathematical straightness, radius, measured zone, and tolerance remain model-specific.
Keep the term attached to the maker, model, language, and dated source.
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02 End-on slice Open field
Cross-section
Chokuba does not define the end-on blade-body section.
Leave openRidge, hollowing, thickness, partner blade, and inner relief remain open.
This route does not settle the field; record it separately.
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03 Magnified working edge Open field
Edge / grind
Straight blade line can coexist with different final edges.
Leave openConvex, beveled, finish, serration, condition, and service route remain open.
This route does not settle the field; record it separately.
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04 Declared axis + view Source-scoped
Spatial curve
Compare from a declared side or plan view, heel to tip.
Leave openCamera angle, scale, model length, and radius datum remain open.
The route supports this vocabulary, within the cited source boundary.
Description
Chokuba (直刃) is Japanese trade vocabulary for a straight or comparatively straight plan-view blade line. Exact radius, capture, edge grind, and technique suitability remain maker- and model-specific.
Chokuba (直刃) names a straight or comparatively straight blade line: the path of the cutting edge from heel to tip when the shear is viewed from the side. It does not, by itself, define the blade’s cross-section, final edge grind, inner relief, steel, tension, or intended technique.
Read the Label on the Right Axis
| Chokuba can describe | Chokuba does not prove |
|---|---|
| A line that is relatively straight within a maker’s range | Mathematical straightness or a universal radius |
| The heel-to-tip path seen in plan view | Convex, beveled, or any other final edge grind |
| A maker’s position on its straight-to-curved line family | Absolute capture, release, or simultaneous contact across a section |
| A useful model-selection clue | One technique, tension setting, steel grade, or service interval |
What Current Maker Evidence Supports
Joewell’s blade guide compares its straight, ordinary or willow, and bamboo-leaf lines. Within that maker’s system, the straighter line is described as holding hair more readily, while greater curvature lets more hair move toward the tip. This supports a relative design intention inside the Joewell range. It does not turn “straight” into an absolute grip or technique rule for every shear.
Other makers use different names, diagrams, and radii. A model described as straight by one company is not automatically dimensionally equivalent to another company’s Chokuba, 800R, or near-straight model.
Selection Checklist
Before treating a straight-line label as a buying recommendation, verify:
- the exact maker and model;
- the maker’s blade-line diagram or published radius, including what portion is measured;
- blade length, width, section, and the construction of both blade halves;
- the final edge grind and finish;
- the maker-listed techniques; and
- capture, release, and tip accuracy on the hair state and motion you actually use.
Current product pages often associate straight or near-straight lines with blunt, base, line, or detail work. Those are useful model-level shortlists, not universal exclusions for slide, point, texturizing, or scissor-over-comb techniques.
Service Boundary
Preserve the model’s complete geometry, not merely its visible line. A comparatively straight line does not make the edge flat, eliminate inner relief, or guarantee that standard equipment can restore it. Follow the maker’s service route or use a technician who can identify the exact edge and blade construction before removing steel.
See Also
Blade lines → · Blade cross-sections → · Convex edge → · Best blunt-cut shears →
Key Characteristics
- Comparatively straight cutting line when viewed from the side
- A blade-line description, separate from blade section and edge grind
- Defined relative to each maker's own geometry range
- Does not establish one radius, tension setting, or cutting result
Use this entry for
- Comparing maker-listed straight-line models
- Reviewing models a maker assigns to blunt, base, line, or detail work
- Separating plan-view blade line from section and edge grind
- Testing capture and release on the intended section and motion
Sources
2 sources- Joewell Scissors — Official Japan (manufacturer official)
- 🇯🇵 SisRma — Scissor Information Portal (industry reference)
Frequently Asked Questions
4 answers you can open one at a timeWhat does Chokuba mean?
Chokuba (直刃), also romanized chokuha, means a straight blade or straight blade line. In manufactured shears, ‘straight’ is relative: makers compare it with the more curved lines in their own ranges rather than using one published industry-wide radius.
Is Chokuba the opposite of a convex edge?
No. Chokuba describes the plan-view cutting line from heel to tip, while convex describes an outer edge or blade-surface profile. A model can combine a comparatively straight blade line with a convex, semi-convex, beveled, or other maker-specified edge construction.
Does a Chokuba blade guarantee a fixed capture result?
No. Some makers describe their straighter lines as holding hair more readily than the curved lines in the same range. That is a relative maker claim, not proof that every Chokuba produces the same capture, release, or perimeter result.
Does Chokuba determine how the shear should be sharpened?
No. Service depends on the complete construction: edge grind, blade section, inner relief, finish, alignment, and the maker’s repair specification. The plan-view line alone does not make a shear suitable for a general-purpose sharpening method.
Comments & questions
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