schema_version: 1
name: enclosure-base
intent: >-
  Lower body of a two-part box enclosure: one connected solid in millimetres, 100 x 150 x 47,
  with r = 10 vertical outer corners, an r = 2 bottom edge round and a flat sharp rim at z = 47
  (the parting plane with the lid). A 94 x 144 cavity with r = 7 corners runs from the 3 mm floor
  (z = 3) through the open top; four free-standing Ø10 screw posts at (±38, ±63) stand on the
  floor up to z = 47, each with a Ø4 blind bore that stops at the floor top. The specification
  sources/enclosure-base-spec.md is authoritative; the three renders are illustrative.
units:
  length: mm
  angle: deg
material: null
density_kg_m3: null
process: null
release_status: reconstruction

frame:
  origin: "centre of the 100 x 150 footprint on the flat bottom face (z = 0)"
  axes:
    x: "along the 100 mm outer width; mirror plane x = 0"
    y: "along the 150 mm outer length; mirror plane y = 0"
    z: "up from the bottom face to the rim at z = 47; all material at z >= 0"
  datums:
    - name: A
      description: "flat bottom face, z = 0, facing -z"
    - name: B
      description: "mid-plane x = 0 (symmetry plane across the width)"
    - name: C
      description: "mid-plane y = 0 (symmetry plane across the length)"
    - name: D
      description: "rim / parting plane z = 47, facing +z, flat with sharp edges"

envelope:
  min: [-50, -75, 0]
  max: [50, 75, 47]
  tolerance: 0.05

parameters:
  - name: outerWidth
    value: 100
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Outer width (x)"
    tolerance: 0.01
    description: "outer footprint extent along x"
    edit_test:
      delta: 10
      expect:
        volume_delta: 7122.83
        direction: increase
        bbox_delta: [10, 0, 0]
        tolerance_rel: 0.02
      sweep:
        values: [90, 100, 110]
      infeasible_deltas: [-70]
  - name: outerLength
    value: 150
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Outer length (y)"
    tolerance: 0.01
    description: "outer footprint extent along y"
  - name: baseHeight
    value: 47
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Height of the base, bottom face to rim"
    tolerance: 0.01
    description: "bottom face to rim; lower part of a 50 mm box split 4 mm below its top"
  - name: wallThickness
    value: 3
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Wall thickness (side walls and floor)"
    tolerance: 0.01
    description: "side wall and floor thickness; the floor top is at z = wallThickness"
  - name: outerCornerRadius
    value: 10
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Outer vertical corner radius"
    tolerance: 0.01
    description: "radius of the four vertical outer corners"
  - name: bottomEdgeRadius
    value: 2
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Outer bottom edge round"
    tolerance: 0.01
    description: "round on the bottom perimeter edge; the rim edges stay sharp"
  - name: innerCornerRadius
    value: 7
    unit: mm
    provenance: derived
    formula: "outerCornerRadius - wallThickness"
    source: "enclosure-base-spec.md, Parameters: Inner (cavity) vertical corner radius 7 (= 10 - 3)"
    tolerance: 0.01
    description: "radius of the four vertical cavity corners"
  - name: cavityWidth
    value: 94
    unit: mm
    provenance: derived
    formula: "outerWidth - 2 * wallThickness"
    source: "enclosure-base-spec.md, Construction 2"
    tolerance: 0.01
    description: "cavity extent along x"
  - name: cavityLength
    value: 144
    unit: mm
    provenance: derived
    formula: "outerLength - 2 * wallThickness"
    source: "enclosure-base-spec.md, Construction 2"
    tolerance: 0.01
    description: "cavity extent along y"
  - name: postInset
    value: 12
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Screw-post inset from the outer faces"
    tolerance: 0.01
    description: "distance from each outer face to the post axes; preserved when outerWidth changes"
  - name: postX
    value: 38
    unit: mm
    provenance: derived
    formula: "outerWidth / 2 - postInset"
    source: "enclosure-base-spec.md, Parameters: post axes at x = ±38"
    tolerance: 0.01
    description: "|x| of the post axes"
  - name: postY
    value: 63
    unit: mm
    provenance: derived
    formula: "outerLength / 2 - postInset"
    source: "enclosure-base-spec.md, Parameters: post axes at y = ±63"
    tolerance: 0.01
    description: "|y| of the post axes"
  - name: postOuterDiameter
    value: 10
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Screw-post outer diameter"
    tolerance: 0.01
    description: "outer diameter of the four screw posts"
  - name: postBoreDiameter
    value: 4
    unit: mm
    provenance: stated
    source: "enclosure-base-spec.md, Parameters: Screw-post bore diameter"
    tolerance: 0.01
    description: "diameter of the blind bore in each post, from the post top down to z = wallThickness"
    edit_test:
      delta: 1
      expect:
        volume_delta: -1244.07
        direction: decrease
        bbox_delta: [0, 0, 0]
        tolerance_rel: 0.02
      sweep:
        values: [3, 4, 5]
      infeasible_deltas: [6]

features:
  - id: outerBody
    kind: extrude
    description: >-
      outerWidth x outerLength footprint with outerCornerRadius vertical corners, extruded from
      z = 0 to baseHeight; flat rim at z = 47 with sharp edges
    parameters: [outerWidth, outerLength, baseHeight, outerCornerRadius]
    verify:
      - method: bbox
      - method: face
        face: rim
      - method: dimension
        dimension: widthX
      - method: dimension
        dimension: lengthY
      - method: dimension
        dimension: heightZ
      - method: solid
        points: [[0, 73.5, 25], [0, -73.5, 25], [48.5, 0, 25], [-48.5, 0, 25]]
  - id: bottomRound
    kind: fillet
    description: "bottomEdgeRadius round on the bottom perimeter edge"
    parameters: [bottomEdgeRadius]
    verify:
      - method: face
        face: bottom_face
      - method: section
        section: section_floor_z1p5
  - id: cavity
    kind: pocket
    description: >-
      cavityWidth x cavityLength pocket with innerCornerRadius corners from the floor top
      z = wallThickness up through the open top; sharp cavity floor edges
    parameters: [cavityWidth, cavityLength, innerCornerRadius, wallThickness]
    verify:
      - method: face
        face: cavity_floor
      - method: section
        section: section_mid_z25
      - method: count
        section: section_mid_z25
        count: 5
      - method: void
        points: [[0, 0, 25], [0, 0, 4.5], [20, 30, 45]]
      - method: solid
        points: [[0, 0, 1.5], [20, -30, 1.5]]
  - id: posts
    kind: boss
    description: >-
      four free-standing Ø postOuterDiameter screw posts at (±postX, ±postY) from the floor top
      z = wallThickness to baseHeight, joined to the floor
    parameters: [postX, postY, postInset, postOuterDiameter, baseHeight, wallThickness]
    count: 4
    verify:
      - method: cylinder
        cylinder: post_pp
      - method: cylinder
        cylinder: post_mp
      - method: cylinder
        cylinder: post_mm
      - method: cylinder
        cylinder: post_pm
      - method: section
        section: section_posts_x38
      - method: solid
        points: [[41.5, 63, 25], [-41.5, 63, 25], [-41.5, -63, 25], [41.5, -63, 25]]
  - id: bores
    kind: hole
    description: >-
      Ø postBoreDiameter blind bore in each post from its top down to the floor top
      z = wallThickness; solid floor remains under each bore
    parameters: [postBoreDiameter, postX, postY, wallThickness]
    count: 4
    verify:
      - method: cylinder
        cylinder: bore_pp
      - method: cylinder
        cylinder: bore_mp
      - method: cylinder
        cylinder: bore_mm
      - method: cylinder
        cylinder: bore_pm
      - method: face
        face: bore_floor_pp
      - method: face
        face: bore_floor_mp
      - method: face
        face: bore_floor_mm
      - method: face
        face: bore_floor_pm
      - method: void
        points: [[38, 63, 25], [-38, 63, 25], [-38, -63, 25], [38, -63, 25]]
      - method: solid
        points: [[38, 63, 1.5], [-38, 63, 1.5], [-38, -63, 1.5], [38, -63, 1.5]]

interfaces:
  - name: partingPlane
    description: >-
      the rim height and the two mirror planes that locate the lid; neither edit test moves the
      rim plane or breaks the symmetry
    must_not_change: true
    checks: [heightZ, symX, symY]

acceptance:
  volume:
    expected: 118431.5
    tolerance_rel: 0.002
    provenance: measured (reference model)
    note: >-
      spec reference measurement; analytic check: outer rounded prism 14914.16 x 47 minus the
      bottom-round spandrel ring 412.06 (Pappus) minus cavity 13493.94 x 44 plus four post
      annuli 65.97 x 44 x 4 = 118431.48
  surface_area:
    expected: 80261.3
    tolerance_rel: 0.005
    provenance: derived
    note: >-
      bottom 13961.06 + bottom round 1319.47 + 183.07 + outer walls 482.83 x 45 + rim 1420.22 +
      cavity walls 463.98 x 44 + cavity floor 13179.78 + post sides 4 x pi x 10 x 44 + post tops
      4 x 65.97 + bore walls 4 x pi x 4 x 44 + bore floors 4 x 12.57
  center_of_mass:
    expected: [0, 0, 16.21]
    tolerance: 0.1
    provenance: derived
    note: >-
      x, y = 0 by symmetry; z = sum(V_i z_i) / V with the prism at 23.5, the spandrel ring at
      0.447, the cavity and the posts at 25: 16.207
  solid_count: 1
  sections:
    - id: section_mid_z25
      plane: z
      at: 25
      expect:
        area: 1684.1
        area_tolerance_rel: 0.005
        loops: 5
        holes: 5
      description: "wall ring (cavity hole) plus four post annuli (bore holes)"
    - id: section_floor_z1p5
      plane: z
      at: 1.5
      expect:
        area: 14883.5
        area_tolerance_rel: 0.005
        loops: 1
        holes: 0
      description: "solid floor, no bore breaks through"
    - id: section_posts_x38
      plane: x
      at: 38
      expect:
        area: 1240.28
        area_tolerance_rel: 0.005
        loops: 1
        holes: 0
      description: >-
        y-z section through the posts at y = ±63: floor strip 150 x 3 less two r = 2 corners
        (448.28) + two end walls 3 x 44 (264) + four post-wall strips 3 x 44 (528); the bores
        open at the top so no hole loops
  faces:
    - name: bottom_face
      plane: z
      at: 0
      normal: "-"
      area: 13961.1
      area_tolerance_rel: 0.005
      center: [0, 0]
      mode: one
    - name: cavity_floor
      plane: z
      at: 3
      normal: "+"
      area: 13179.8
      area_tolerance_rel: 0.005
      center: [0, 0]
      mode: one
    - name: bore_floor_pp
      plane: z
      at: 3
      normal: "+"
      area: 12.57
      area_tolerance_rel: 0.01
      center: [38, 63]
      mode: one
    - name: bore_floor_mp
      plane: z
      at: 3
      normal: "+"
      area: 12.57
      area_tolerance_rel: 0.01
      center: [-38, 63]
      mode: one
    - name: bore_floor_mm
      plane: z
      at: 3
      normal: "+"
      area: 12.57
      area_tolerance_rel: 0.01
      center: [-38, -63]
      mode: one
    - name: bore_floor_pm
      plane: z
      at: 3
      normal: "+"
      area: 12.57
      area_tolerance_rel: 0.01
      center: [38, -63]
      mode: one
    - name: rim
      plane: z
      at: 47
      normal: "+"
      area: 1420.2
      area_tolerance_rel: 0.005
      center: [0, 0]
      mode: one
    - name: post_top_pp
      plane: z
      at: 47
      normal: "+"
      area: 65.97
      area_tolerance_rel: 0.01
      center: [38, 63]
      mode: one
    - name: post_top_mp
      plane: z
      at: 47
      normal: "+"
      area: 65.97
      area_tolerance_rel: 0.01
      center: [-38, 63]
      mode: one
    - name: post_top_mm
      plane: z
      at: 47
      normal: "+"
      area: 65.97
      area_tolerance_rel: 0.01
      center: [-38, -63]
      mode: one
    - name: post_top_pm
      plane: z
      at: 47
      normal: "+"
      area: 65.97
      area_tolerance_rel: 0.01
      center: [38, -63]
      mode: one
  cylinders:
    - name: bore_pp
      point: [38, 63, 3]
      direction: [0, 0, 1]
      kind: hole
      diameter: 4
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "blind bore, z 3 .. 47"
    - name: bore_mp
      point: [-38, 63, 3]
      direction: [0, 0, 1]
      kind: hole
      diameter: 4
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "blind bore, z 3 .. 47"
    - name: bore_mm
      point: [-38, -63, 3]
      direction: [0, 0, 1]
      kind: hole
      diameter: 4
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "blind bore, z 3 .. 47"
    - name: bore_pm
      point: [38, -63, 3]
      direction: [0, 0, 1]
      kind: hole
      diameter: 4
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "blind bore, z 3 .. 47"
    - name: post_pp
      point: [38, 63, 3]
      direction: [0, 0, 1]
      kind: pin
      diameter: 10
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "free-standing screw post, z 3 .. 47"
    - name: post_mp
      point: [-38, 63, 3]
      direction: [0, 0, 1]
      kind: pin
      diameter: 10
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "free-standing screw post, z 3 .. 47"
    - name: post_mm
      point: [-38, -63, 3]
      direction: [0, 0, 1]
      kind: pin
      diameter: 10
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "free-standing screw post, z 3 .. 47"
    - name: post_pm
      point: [38, -63, 3]
      direction: [0, 0, 1]
      kind: pin
      diameter: 10
      radius_tolerance: 0.02
      length: 44
      length_tolerance: 0.1
      t_range: [0, 44]
      description: "free-standing screw post, z 3 .. 47"
  dimensions:
    - name: widthX
      axis: x
      expected: 100
      tolerance: 0.05
      description: "bbox extent along x"
    - name: lengthY
      axis: y
      expected: 150
      tolerance: 0.05
      description: "bbox extent along y"
    - name: heightZ
      axis: z
      expected: 47
      tolerance: 0.05
      description: "bbox extent along z (bottom face to rim)"
  solids:
    - name: body
      contains_point: [0, 0, 1.5]
      description: "the single connected solid"
  thickness:
    - name: min_wall
      min: 2.9
      stat: p05
      description: "p05 of the inward thickness; walls, floor and post walls are all 3"
  probes:
    - name: cavityVoid
      state: void
      points: [[0, 0, 25], [0, 0, 4.5], [20, 30, 45], [-20, -30, 10]]
      description: "open cavity above the floor"
    - name: boreVoid
      state: void
      points: [[38, 63, 25], [-38, 63, 25], [-38, -63, 25], [38, -63, 25]]
      description: "bore axes at mid-height"
    - name: floorSolid
      state: solid
      points: [[0, 0, 1.5], [20, -30, 1.5], [38, 63, 1.5], [-38, 63, 1.5], [-38, -63, 1.5], [38, -63, 1.5]]
      description: "floor mid-thickness, including under each bore"
    - name: wallSolid
      state: solid
      points: [[0, 73.5, 25], [0, -73.5, 25], [48.5, 0, 25], [-48.5, 0, 25]]
      description: "side wall mid-thickness"
    - name: postWallSolid
      state: solid
      points: [[41.5, 63, 25], [-41.5, 63, 25], [-41.5, -63, 25], [41.5, -63, 25]]
      description: "post wall mid-thickness (radius 3.5 from the axis)"
  cylinder_counts:
    - name: boreCount
      diameter: 4
      radius_tolerance: 0.02
      kind: hole
      direction: [0, 0, 1]
      expected: 4
    - name: postCount
      diameter: 10
      radius_tolerance: 0.02
      kind: pin
      direction: [0, 0, 1]
      expected: 4
  symmetry:
    - name: symX
      plane: x
      at: 0
      max_deviation: 0.1
      p95_deviation: 0.05
    - name: symY
      plane: y
      at: 0
      max_deviation: 0.1
      p95_deviation: 0.05
  blockout:
    volume_min: 690000
    volume_max: 706000

references:
  - path: sources/enclosure-base-spec.md
    kind: text
    role: authoritative
    sha256: 5fea818692cbc29954c48cebb5413d22ad2b7f42ae80416c72d6d387ef1b2002
    units: mm
    note: "specification: parameters, construction and reference measurements"
  - path: sources/enclosure-base-iso.png
    kind: image
    role: illustrative
    sha256: 2a8fd145c1e633fdafe492ced42153af2857af9dcff05c33c6323383ed0f1382
    units: mm
    note: "isometric render of the reference: four posts, open top, bottom round"
  - path: sources/enclosure-base-top.png
    kind: image
    role: illustrative
    sha256: d2082d6515363d4843797322498e9f62ae0f9a60f9b725bbc8b916171e7deb7b
    units: mm
    note: "top view, +x right, +y up: wall ring and four posts with bores"
  - path: sources/enclosure-base-section.png
    kind: drawing
    role: illustrative
    sha256: d15e879f8de5dee0e38f58a63a70206e7099478c43379d0b2ed5f1ba6728a3d8
    units: mm
    note: "section x = 38 (y-z plane) through two posts, mm axes"

open_questions:
  - "Material, density and process are not stated; no mass claim is made."
  - "The blockout band (690000 .. 706000) assumes the envelope-only blockout is the solid outer body (rounded prism 700553 to sharp box 705000), not the hollowed shell."