Choku-ba (直刃) Blade Line
Blade linesA line name needs a maker, plane, radius basis, and zone
The same Japanese or translated label can cover different radii and intended uses across makers. Apply to Choku-ba (直刃) Blade Line
- 01 Wording Keep the source language, maker, model, market, and date.
- 02 Measurement Record radius with blade or chord length and measurement basis.
- 03 Scope Identify uniform or zoned curve and plan or vertical plane.
- 04 Context Add section, edge, width, pairing, and maker-stated use.
Do not inferStraight, willow, bamboo, leaf, oval, propeller, yanagiba, sasaba, or 800R is not a cross-maker performance scale.
Description
Choku-ba is straight-blade vocabulary used in scissor catalogues. Verify the exact model's line, view, dimensions, section, edge, use statement, and service route.
Choku-ba (直刃) — straight-blade wording
Choku-ba combines Japanese wording associated with “straight” and “blade.” In a scissor catalogue, it can identify a comparatively straight heel-to-tip line within that maker’s range.
The term does not establish a perfectly straight line, a shared radius, or a national design standard. Preserve the maker’s original wording, exact model, size, market, and dated source.
What the term establishes
| Supported cue | What remains open |
|---|---|
| The cited source uses straight-blade or straight-line wording | Mathematical straightness, radius, tolerance, and measurement zone |
| A line comparison may be intended within one maker’s range | Cross-brand curve order or equivalence |
| The term points to the heel-to-tip line when the source says so | Body cross-section, final edge, inner relief, and partner-blade construction |
| A maker may publish an intended use for a named model | Universal technique result, hair-type match, user level, or quality rank |
A product photograph can suggest a line but cannot establish precise geometry without a declared view, scale, and camera correction.
Keep the other geometry fields separate
- Blade line: heel-to-tip path in a declared side or plan view.
- Body cross-section: end-on form of each blade half.
- Edge or grind: the maker-stated working surface, finish, honing, or serration.
- Inner geometry: relief, hollowing, contact lands, pairing, set, and current condition.
Choku-ba fills only the first field when the source uses it that way.
Exact-model record
Capture:
- maker, model, code, size, handed variant, market, and date;
- original term and maker-supplied translation;
- full blade drawing or photograph with a declared viewpoint;
- heel and tip datums, measured zone, and any published dimension or radius basis;
- section, edge, finish, inner relief, partner blade, and pivot;
- maker-stated use and limitations;
- condition, adjustment, and service history; and
- trial, return, warranty, and qualified service terms.
Leave unpublished fields unresolved. Do not borrow a radius, technique claim, or service rule from another choku-ba model.
Trial the complete shear
Line geometry can contribute to contact during closing, but the observed result also depends on section, edge, blade pairing, set, pivot, adjustment, size, handedness, condition, material, task, and operator motion.
Compare exact candidates under the same permitted conditions. Record control, push, fold, drag, effort, noise, and repeatability without assigning the result to the line name alone.
Service boundary
Choku-ba does not prescribe a pivot setting, drop-test target, abrasive, machine, angle, or sharpening direction. Ask the maker or qualified provider how they will identify and preserve the exact model’s line, section, edge, inner relief, pairing, and set, and document the work performed.
Sources Reviewed
2 scoped sources behind this entry- Secondary 🇯🇵 SisRma — Scissor Information Portal (industry reference)
- Secondary 🇯🇵 JapanCut-a-Blog — Slide Cut Methods (specialist blog)
Frequently Asked Questions
3 answers you can open one at a timeWhat does choku-ba mean in a scissor catalogue?
Choku-ba (直刃) is commonly translated as straight blade or straight blade line. It is a maker-local geometry cue, not proof of a perfectly straight mathematical line or a universal radius threshold.
Is choku-ba always best for blunt cutting or barbering?
No family label establishes the best technique match. Check the exact model’s drawing, section, edge, partner blade, size, handedness, condition, and maker-stated use, then evaluate the complete shear in a controlled trial.
Does choku-ba require a particular tension or sharpening method?
No universal setting or service process follows from the name. Use the exact maker’s care and adjustment instructions and a provider who can inspect and preserve the model’s complete geometry.
Comments & questions
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