cdsl-cad/backend/agent/skills/cad-engine/references/part-skills/source/functional/slotted-adjustment-feature.functional.md

Slotted Adjustment Feature Functional Skill

When to use

• A plate, bracket, clamp, guide, or mounting part needs an elongated slot for positional adjustment, clearance, sliding, or alignment.
• The request mentions slot, slotted hole, adjustment slot, elongated hole, guide slot, keyway-like slot, or obround cutout.

Do not use when

• The feature is a simple round hole with no adjustment function.
• The slot is actually a shaft keyway or turned groove; use a shaft/keyway-specific rule if available.
• The slot is decorative and not tied to fastening, travel, or clearance.

Recognition features

• Elongated hole with two semicircular ends and straight sides.
• Slot located on a flat plate/bracket face or through a wall.
• Often paired, mirrored, or patterned.
• Can coexist with counterbored holes, threaded holes, ribs, or edge chamfers.

Core invariants

• Slot width should match the fastener/shaft clearance role.
• Slot length defines adjustment travel and must be longer than the fastener diameter.
• Keep end radii equal to half the slot width for manufacturable milled/slot features.
• Dimension slots from datums and centerlines.
• Cut slots after the base body exists and before final chamfers/fillets.

Parameter roles

• slot_width defines cutter or fastener clearance.
• slot_length defines adjustment range.
• end_radius is usually slot_width / 2.
• slot_center, slot_angle, and edge_margin locate the slot.
• slot_depth or through_all defines end condition.

Construction sequence

1. Select the planar face or reference plane where the slot starts.
2. Sketch an obround slot from centerline, length, and width.
3. Cut through all or to the required depth.
4. Pattern or mirror the slot if repeated.
5. Add small chamfers to slot edges after the cut is complete.

Common failures

• Modeling a slot as a rectangle with sharp internal corners.
• Making the slot length equal to the hole diameter, removing adjustment function.
• Placing slots without enough wall material at the ends.
• Confusing a bracket adjustment slot with a shaft keyway or revolved groove.

Evidence summary

• Latest run evidence: 38 accepted functional insights matched slot, slotted adjustment, guide slot, or slot/cutout behavior.
• Strong repeated names include use_slots_for_adjustment, use_cut_extrude_for_holes_and_slots, central_slot_for_alignment, and cut_slots_for_adjustment.
• Frequent operations in the latest run: Cut, Extrusion, LinearPattern, MirrorPattern, Chamfer.
• Source model examples: 004764, 005640, 006514, 011853, 026940, 043134, 058682, 096676, 106216, 156844, 163197, 185756, 199739, 213507, 240416.
• Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.

Retrieval metadata

Triggers:

• slot
• slotted hole
• adjustment slot
• elongated hole
• guide slot

Secondary triggers:

• obround
• clearance slot
• mounting adjustment
• sliding
• alignment slot

Operation triggers:

• sketch slot
• cut extrude slot
• mirror slot
• linear pattern slot
• chamfer slot edge

Exclusions:

• round hole only
• shaft keyway
• revolved groove
• decorative cutout