A knife model should
explain a real knife.

These published examples establish scale and construction differences. They are references, not product recommendations or source shapes for the original Knife Lab model. Blade length, sharpened-edge length and overall knife length are different measurements.

The designer includes original blade and handle libraries, with independent grind controls. General-purpose, traditional, field, kitchen, fish and butchery families can be combined with the handle library. Thumbnails, custom editor, 3D blade and exported outlines share geometry definitions. Open the full designer ↗

These are original adjustable mechanisms. Manufacturer references explain why the families differ; they do not supply the model's internal dimensions. Use the eight construction comparisons to inspect outlines, real mesh sections and matching 3D studies.

Traditional handed single-bevel blades and urasuki backs remain outside the blade model. Deba-, yanagiba-, usuba- and kiridashi-inspired entries still use its symmetric double-bevel section. Broader handle coverage does not change those blade assumptions.

A full-width plate between scales, a narrow wa insert and an end-retained bar are different steel shapes. Their root, length, section and fitting seat should be designed together. The original Knife Lab families illustrate these relationships; a familiar handle exterior does not reveal a commercial knife’s hidden core.

Exact proprietary molded anchors, welded connections, commercial tang tapers and production fits remain unknown unless a source exposes or specifies them. Review the exposed-blade sources and their limits ↗

In the exposed-scale family, a Corby fastener is a screw-together assembly with a smaller central shaft and larger heads. Its scale seats and tang hole do different jobs. The rounded outside of a scale should retain a flat mating face against the tang.

The review covers the workbench tools and the added edge-section and board-contact studies. Their arithmetic is useful within the stated models. A more detailed 3D scene does not silently turn the simpler calculators into measured knife simulations.

The viewer uses separate closed meshes appropriate to the selected construction. A blade and tang share the heel interface. Exposed-scale assemblies add two scales, two halves per fastener and an optional open lanyard tube. Other families add an enclosing grip or shell, front and rear fittings, and individual stack washers where selected. The section panel cuts those actual meshes. Geometry tests check finite coordinates, closed edges, positive volume and modeled openings; they do not establish production fits. Camera orbit and the exploded view expose the assembly.

The blade and tang are separate closed rendering meshes that meet at the heel and represent one steel component. Fastener threads, final fitting, microscopic edge radius, belt compliance, heat treatment and cutting behavior are outside this visual model. Material textures illustrate appearance. Bevel angles refer to transverse sections at a constant longitudinal station. On curved or angled cutting edges, the angle in a plane perpendicular to the local edge can differ; this is not a constant edge-normal sharpening model. Profile names identify broad outline families; they do not assign a steel, grind, edge count or physical use rating. Shun's kitchen-shape guide and ESEE's Nessmuk-style JG5 description distinguish those names from separate construction specifications.

1. Actual three-dimensional surfaces. Camera orbit must reveal modeled bevels, taper and scale contours. Lighting alone cannot create missing geometry.
2. A continuous local blade section. Shoulder thickness, land and bevel height must remain compatible with the narrowing outline. A fixed land cannot become thicker than the local tapered stock; the point needs deliberate closure.
3. Separate taper and primary grind. Inspect along the spine for longitudinal thickness change, and across a section for flat, hollow, convex or compound shape. Define the plunge and unground region deliberately.
4. Construction-specific interfaces. Scales retain flat tang contacts and head-seat shoulders. Enclosing grips retain a cavity around the core; shells need inner and outer surfaces; separate stack washers need through openings. Inspect front and rear fittings as parts of the assembly.
5. Hardware that belongs to the assembly. Scale construction shows mating fastener halves, smaller shafts, larger seats and an optional annular tube. Through and stacked grips show rear retention instead. Nut-like and peened-style shapes illustrate choices; they do not model functional threads, deformation or verified engagement.
6. Geometry checks at control extremes. Look for crossed surfaces, inverted local thickness, exposed head pockets and nonfinite vertices. A closed mesh still does not establish a manufactured fit or cutting result.

The live mass-and-balance tool uses the original 3D assembly, rather than equivalent rectangles. It integrates the oriented triangle surface of each closed part to obtain its volume and centroid. Modeled bevels, holes, hollow shells and internal grip cavities therefore affect the estimate. For each part, mass in grams equals volume in mm³ × assigned density in kg/m³ × 0.000001. The assembly center is the mass-weighted mean of the part centroids. Curved surfaces are approximated by finite triangles, and each component uses uniform density. These are properties of that triangle model. The component material regions are assumed disjoint: shared interface caps add zero volume, while positive overlap would be counted twice. The calculation sums parts; it does not perform a Boolean union.

Coordinates refer to the assembled knife: x = 0 is the blade heel/plunge, negative x points toward the tip, and positive x points toward the grip. The blade and tang meet at the heel and represent one steel component. Other components occupy their modeled material volumes; a cavity contains no grip material. Exploding, rotating or clipping the display does not relocate the reported assembled center of mass. Its x projection is a balance coordinate, not a prediction of hand comfort, cutting behavior or an ideal balance point.

The service-density calculation follows USDA Wood Handbook (2021), Chapter 4, equations 4–12 to 4–14. Let Gᵦ be basic density divided by 1000 kg/m³ and M the entered moisture percentage. The model uses Gₘ = Gᵦ / [1 − 0.265(1 − M/30)Gᵦ], then ρₘ = 1000Gₘ(1 + M/100) kg/m³, for 0–30% moisture. The 30% fiber-saturation point and shrinkage relationship are approximate assumptions, not measurements of the selected piece. The default 12% result is labeled an estimated service density and keeps the raw basic value separate.

Use the custom density override for measured stock, especially stabilized or resin-filled burl. Measure mass and volume in the same material condition; do not apply an untreated-wood moisture correction to a composite. Species, growth conditions, moisture, voids and added resin can change the actual blank. Review the steel, grip, fittings, hardware and spacer density assignments independently. A black ferrule, wood-like texture or metal sheen does not identify a material grade.

Unmodeled adhesive, functional threads, weld deposits, ballast, surface coatings and finishing losses are absent. The calculation does not discover overlaps or reconstruct missing commercial internals. Physical mass and balance should be measured on a prototype and compared with the stated assumptions; disagreement is evidence to investigate, not a reason to change density without explanation.

Wood data attribution: Fischer FJ et al. (2026), Global Wood Density Database v.2, v2.2 (with metadata), Zenodo version DOI, associated paper, licensed CC BY 4.0. Knife Lab extracts the published model means, converts g/cm³ to kg/m³ and applies the separately disclosed service-moisture estimate. The raw density basis and source identifiers are retained.

• Morakniv / Garberg Black Blade CPublished dimensions, tang type and separate primary/edge angles.
• Morakniv / Companion SDimensions and standard-tang construction.
• ESEE / ESEE-4 specificationsBlade, cutting edge, overall length and stock are distinct.
• ESEE / Sharpening FAQHand-applied edge angle and its variation.
• Spyderco / Bow RiverFull-flat blade and contoured full-tang handle description.
• Spyderco / Manufacturer grind glossarySection and bevel-extent terminology.
• Jantz / Corby rivetsScrew-together construction and supplier-specific dimensions.
• Maker Material Supply / Corby dimensionsHead, shaft and matching counterbore relationships.
• Harvey Performance / Chip thinningWhy feed per tooth and chip thickness can differ.
• Autodesk / Manufacturing simulationWhat represented geometry and machine verification cover.
• Helle / VikingThrough tang and end-pinned washer; fitting dimensions are not supplied.
• GLOBAL / GF-33Forged chef and thick collar; no dimensioned hollow interior is supplied.
• KA-BAR / Current 1217Maker inch dimensions, leather grip and 12GA carbon-steel guard.
• KA-BAR / Handle component kitSeparate leather washers, spacers, guard, butt cap and pin.
• KA-BAR / Construction FAQPressed pommel and stainless cross-pin; the teaching model’s nut-like retainer is an original alternative.
• Estwing / Current BowieOne-piece forged steel is distinct from stacked leather and hollow shells.