92 lines
3.3 KiB
Markdown
92 lines
3.3 KiB
Markdown
# Hexagonal Nut Planning Skill
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## When to use
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- The request describes a hex nut, hexagonal nut, machined nut, nut-like fastener, or hexagonal threaded insert.
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- The key features are wrench flats, a central threaded bore, and chamfered faces/edges.
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## Do not use when
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- The part is a bolt, screw, socket head cap screw, threaded rod, wing nut, cap nut, or flange nut unless the prompt explicitly asks for that variant.
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- The hexagon is only a decorative grip on another part.
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- The threaded feature is external rather than an internal bore.
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## Recognition features
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- Six flat wrench faces or hexagonal prism envelope.
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- Central internal threaded hole coaxial with the nut thickness.
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- Chamfers on top and bottom openings and on hex edges.
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- Optional counterbore, lead-in chamfer, or relieved thread entry.
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## Core invariants
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- Keep the threaded bore centered through the hex body.
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- Preserve the hex across-flats size separately from thread size and thickness.
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- Model chamfers as functional lead-ins and edge breaks, not as random bevels.
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- Represent internal thread intent using a threaded hole, thread callout, or helical/revolved cut only when required by output format.
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- Do not generate the mating bolt unless requested.
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## Parameter roles
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- `across_flats` defines wrench size.
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- `thickness` defines nut height.
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- `thread_size`, `thread_diameter`, and `thread_depth` define the central bore.
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- `bore_diameter` defines the pre-thread or clearance hole if thread geometry is abstracted.
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- `face_chamfer` and `edge_chamfer` define lead-in and deburring.
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## Construction sequence
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1. Create the hexagonal body as a hex extrusion or by cutting flats from a revolved/chamfered blank.
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2. Define the central axis through the nut.
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3. Create the central bore or threaded hole through the body.
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4. Add thread representation or thread callout if the CAD output supports it.
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5. Add top/bottom lead-in chamfers and small edge chamfers.
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6. Verify the hex flats remain planar and the bore remains coaxial.
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## Common failures
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- Producing a bolt or screw instead of a nut.
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- Forgetting the central threaded bore.
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- Placing the bore off-center relative to the hex body.
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- Making the chamfers so large that wrench flats disappear.
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- Treating a flange nut, cap nut, or wing nut as a plain hex nut.
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## Evidence summary
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- Latest run evidence: 25 accepted planning insights matched hex nut or nut-like threaded fastener descriptions.
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- Strong repeated names include `plan_hex_nut`, `revolved_hex_nut_with_internal_thread`, `hex_nut_construction`, and `plan_hexagonal_nut_with_threaded_bore`.
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- Frequent operations in the latest run: Revolution, Extrusion, Cut, RevCut, HoleWzd, Chamfer.
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- Source model examples: 009934, 010137, 052867, 066148, 067249, 135604, 138372, 150622, 200147, 204805, 222550, 225767, 231397, 238840.
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- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
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## Retrieval metadata
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Triggers:
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- `hex nut`
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- `hexagonal nut`
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- `nut`
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- `threaded nut`
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- `hexagonal threaded insert`
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Secondary triggers:
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- `internal thread`
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- `central threaded bore`
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- `wrench flats`
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- `across flats`
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- `chamfered nut`
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Operation triggers:
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- `extrude hexagon`
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- `cut central bore`
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- `hole wizard threaded hole`
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- `revolved cut thread`
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- `chamfer faces`
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Exclusions:
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- `bolt`
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- `screw`
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- `threaded shaft`
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- `wing nut`
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- `cap nut`
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- `flange nut`
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