81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
# Shaft Like Reference
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## When to read this file
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Read this reference when the request matches these triggers:
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- `journal`
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- `shaft`
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- `spindle`
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- `主轴`
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- `轴`
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- `键槽`
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## Object boundary
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Use this reference to improve first-pass CAD modeling structure. It is not a validator, factory, or engineering certification. Do not model adjacent assemblies unless the user explicitly requests them.
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## Recognition
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This node represents `mechanical_part.rotating_part.shaft_like` in the generated taxonomy. It was mined from 6 source models.
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## Core invariants
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- A single dominant rotation axis organizes the part.
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- Cylindrical sections should be coaxial and station-based.
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- Journals, shoulders, grooves, threads, or keyways should attach to plausible axial regions.
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## Common variants
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- Keep variants driven by the user prompt and source evidence.
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- Prefer adding a child variant skill when one branch becomes too specific.
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- Do not collapse all examples into one fixed template.
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## Required parameter roles
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- `coaxial_sections`
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- `journals`
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- `main_axis`
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- `shoulders`
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## Feature roles
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- `coaxial_sections`
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- `journals`
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- `main_axis`
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- `shoulders`
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## Operation / construction sequence
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1. Define the shaft axis and axial stations first.
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2. Build the coaxial stack by revolve or fused cylinders.
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3. Cut bores, keyways, grooves, threads, or splines after the base shaft is valid.
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4. Overshoot subtractive tools through the shaft.
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5. Apply shoulder reliefs, chamfers, and fillets last.
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## Common failures to prevent
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- Unnamed magic dimensions hidden inside geometry calls.
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- Decorative features with no functional role.
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- Fillets or chamfers applied before major cuts.
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- Claiming engineering performance or standard compliance from reference guidance alone.
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## Validation targets
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- The generated model contains the core invariants above.
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- Major feature roles are visible or represented by named parameters.
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- Repeated features have consistent count, spacing, and datum relationship.
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- The output is a valid solid or explicitly requested assembly.
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## Exclusions
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- `assembly`
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- `housing`
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## Source evidence summary
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- Source sample count: 6
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- Sample ids: 000166, 000780, 001563, 001836, 001942, 001957
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- Operation evidence: Cut: 6, Extrusion: 2, Chamfer: 1, HoleWzd: 1
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- Taxonomy confidence: 0.95
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