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text-to-cad/skills/cad/references/cad-skillx/planning/simple-shaft-or-cylindrical-rod.planning.md

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+# Simple Shaft Or Cylindrical Rod Planning Skill
+
+## When to use
+
+- The request describes a single cylindrical rod, simple shaft, spacer rod, cylindrical pin, standoff-like cylinder, or shaft-like machined part.
+- The body is primarily a cylinder along one axis, optionally with end holes, chamfers, simple steps, flats, slots, or threaded holes.
+- The task is to generate one part, not a spindle cartridge or shaft assembly.
+
+## Do not use when
+
+- The request describes a spindle module, motor rotor assembly, gearbox shaft assembly, bearings, seals, pulleys, keys, and fasteners together.
+- The part is mainly a flange, washer, bushing, screw, bolt, or complex housing.
+- The body is a hollow tube or bearing sleeve where inner/outer diameter relationship is the main design intent.
+
+## Recognition features
+
+- Long cylindrical body with uniform or stepped diameters.
+- Central axis is the dominant datum.
+- Optional end chamfers, end fillets, centered threaded holes, transverse holes, flats, slots, grooves, or keyway-like cuts.
+- Turning and cylindrical surfaces dominate; milling may appear for flats, slots, or keyways.
+
+## Core invariants
+
+- Establish one main shaft axis and overall length first.
+- Use extrude for a uniform simple cylinder; use revolve for stepped diameters, grooves, shoulders, tapers, or turned profiles.
+- Keep all coaxial diameter changes, end holes, and grooves aligned to the shaft axis.
+- Treat holes, slots, flats, keyways, and threads as secondary features.
+- Do not invent bearings, couplings, gears, or housings unless requested.
+
+## Parameter roles
+
+- `length` defines the axial span.
+- `diameter` defines a simple rod.
+- `step_diameters`, `step_lengths`, `shoulder_positions`, and `groove_width` define turned features.
+- `end_hole_diameter`, `thread_size`, and `thread_depth` define centered end holes.
+- `flat_width`, `slot_width`, `slot_depth`, and `keyway_length` define milled secondary features.
+- `chamfer_distance` and `fillet_radius` define edge finishing.
+
+## Construction sequence
+
+1. Define the shaft axis and overall length.
+2. For a simple rod, sketch a circle and extrude along the axis.
+3. For stepped or shouldered shafts, sketch the half-profile and revolve it around the axis.
+4. Add centered end holes, threaded holes, grooves, flats, slots, or keyways as secondary cuts.
+5. Keep secondary features referenced to the shaft axis or end-face datums.
+6. Finish with end chamfers, shoulder fillets, and small edge breaks.
+
+## Common failures
+
+- Generating a spindle or bearing assembly when only a shaft/rod part was requested.
+- Creating off-axis end holes.
+- Using multiple separate bodies for diameter steps instead of one coherent solid.
+- Treating a threaded shaft, bolt, or screw as the same as a plain shaft without preserving thread/head differences.
+- Adding arbitrary decorative grooves that were not requested.
+
+## Evidence summary
+
+- Latest run evidence: 107 accepted planning insights matched shaft, rod, cylinder, and stepped-shaft construction.
+- Strong repeated names include `plan_stepped_shaft`, `simple_cylinder_extrusion`, `stepped_shaft_construction`, `cylindrical_rod_planning`, and `plan_revolve_shaft_profile`.
+- Frequent operations in the latest run: Extrusion, Revolution, Cut, RevCut, HoleWzd, Chamfer, Fillet.
+- Source model examples: 000166, 001957, 040325, 069352, 080683, 100698, 112997, 144199, 148300, 160726, 172872, 210853, 218803, 225038, 232675, 239358.
+- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.
+
+## Retrieval metadata
+
+Triggers:
+- `cylindrical rod`
+- `simple shaft`
+- `shaft`
+- `rod`
+- `pin`
+- `standoff`
+
+Secondary triggers:
+- `stepped shaft`
+- `end hole`
+- `threaded end`
+- `shaft groove`
+- `keyway`
+- `chamfered ends`
+
+Operation triggers:
+- `extrude circle`
+- `revolve shaft profile`
+- `cut end hole`
+- `cut slot`
+- `chamfer ends`
+
+Exclusions:
+- `spindle assembly`
+- `bearing assembly`
+- `flange`
+- `washer`
+- `bolt head`
+- `gear`