89 lines
3.5 KiB
Markdown
89 lines
3.5 KiB
Markdown
# Mounting Plate Hole Layout Functional Skill
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## When to use
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- A plate or base block needs holes, slots, counterbores, countersinks, or threaded holes positioned from datum edges or centerlines.
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- The layout is rectangular, row-based, symmetric, mirrored, or grid-like rather than circular around a flange axis.
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- The hole layout controls mounting, alignment, adjustment, or fastening.
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## Do not use when
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- Holes are evenly spaced around a circular bolt circle on a flange.
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- The holes are decorative, random, or not functionally related.
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- The main operation is a bearing bore or central shaft seat rather than a mounting-hole layout.
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## Recognition features
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- Flat planar top face or side face used as the hole placement plane.
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- Edge margins, centerline offsets, pitch values, or symmetric pairs.
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- Repeated hole groups, slots, threaded holes, clearance holes, counterbores, countersinks, or dowel holes.
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- SolidWorks evidence often appears as HoleWzd, Cut, LPattern, MirrorPattern, and Chamfer.
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## Core invariants
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- Define plate datums before hole placement.
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- Keep hole centers constrained to margins, pitch, and symmetry instead of free coordinates.
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- Select the hole type from fastening function, not from appearance.
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- Pattern the cut or hole feature after the seed feature is correct.
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- Preserve minimum material around holes and between holes.
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## Parameter roles
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- `datum_edge_x`, `datum_edge_y`, and `centerline` define references.
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- `edge_margin_x`, `edge_margin_y`, `pitch_x`, `pitch_y`, `row_count`, and `column_count` define repeated layouts.
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- `hole_diameter`, `thread_size`, `fit`, and `end_condition` define the hole itself.
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- `counterbore_diameter`, `counterbore_depth`, `countersink_angle`, and `slot_length` define fastener seating or adjustability.
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## Construction sequence
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1. Select the plate face and define construction centerlines or edge-offset dimensions.
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2. Create one seed hole or one seed hole group using HoleWzd or a through cut.
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3. Use linear pattern for rows/grids and mirror for symmetric pairs.
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4. Use slots when the design requires adjustment rather than fixed bolt location.
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5. Add counterbore, countersink, or thread data to the seed hole before patterning where possible.
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6. Add chamfers and deburring features after the functional holes are complete.
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## Common failures
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- Converting counterbored/threaded/countersunk holes into plain cylinders.
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- Patterning sketch circles instead of the actual cut or hole feature.
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- Mixing flange bolt-circle logic into rectangular plate layouts.
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- Missing datum margins, causing holes to float.
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- Placing slots too close to edges or other holes.
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## Evidence summary
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- Current library evidence: 207 reviewed SCAD58 plate-like models.
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- Latest run evidence: high-frequency accepted insights for hole wizard use, standard hole types, symmetric hole placement, linear hole patterns, mirror patterns, slots, and edge chamfers.
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- Frequent operations in the latest run: HoleWzd, Cut, LinearPattern, MirrorPattern, Chamfer.
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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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- `mounting plate hole layout`
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- `base plate hole pattern`
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- `rectangular hole grid`
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- `symmetric mounting holes`
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Secondary triggers:
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- `edge margin`
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- `linear pitch`
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- `counterbored holes`
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- `threaded holes`
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- `slots`
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- `dowel holes`
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Operation triggers:
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- `hole wizard`
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- `linear pattern`
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- `mirror holes`
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- `cut through holes`
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- `counterbore`
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- `countersink`
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Exclusions:
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- `flange bolt circle`
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- `bearing bore`
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- `random decorative holes`
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