# Nominal reconstruction contract. All tolerances are digital comparison bands, not manufacturing tolerances. schema_version: 1 name: nist-amb2022-01-bridge intent: 'Reconstruct the NIST AMB2022-01 individual bridge artifact as editable, parameterized KCL from the attached NIST description excerpts and figures; Figure 3 is the dimensioned plan and elevation drawing and is authoritative for every external dimension. Frame: x along the 75 mm length with x = 0 at the pointed (45 degree tapered) end and x increasing toward the far end, y across the 5 mm width with y = 0 at one long side face, z vertical from the build plate (z = 0) upward. Model the tapered nose, the tall solid end block, the twelve legs with their 45 degree overhangs merging into the solid bridge, the eleven 1 mm wide top tabs on a 7 mm pitch, and the hollow leg L10 with its 0.5 mm outer walls, 1 mm base, four 4 mm tall internal thin walls parallel to x, and flat ceiling, exactly as documented. Where the sources do not fix a dimension (the single- and double-track thin-wall widths), record it as an open question and use a clearly labelled inferred value with a wide tolerance rather than approximating silently. One solid; export STEP and STL. Reference geometry supplied by NIST is for inspection only: the deliverable must be editable construction, never an import.' units: length: mm angle: deg material: null density_kg_m3: null process: Laser powder bed fusion (LPBF); nominal as-designed individual bridge, before ridge skim cutting or EDM sectioning release_status: reconstruction frame: origin: 'Intersection of the build plane z=0, the extension of the lower long-side plane y=0 in Figure 3 plan, and the transverse plane x=0 through the pointed nose. This datum intersection is outside material: the bottom of the actual nose tip is [0,2.5,0].' axes: x: Along the bridge length from the pointed end toward the square far end; rightward in Figure 3, in the displayed Recoat arrow direction. The far end is x=75. y: Across the width from the lower long side in Figure 3 plan (y=0) toward the upper long side (y=5). Upward in plan; the nose centerline is y=2.5. z: Vertically upward from the build plate contact plane z=0. Body top is z=12 and tab tops are z=12.5. datums: - name: A description: Build plate contact plane z=0, shared by the end block and twelve leg footprints; the build plate itself is excluded. - name: B description: Long side plane y=0, reproducible from the straight side behind the nose shoulder x=2.5; +y enters the part. - name: C description: Far end plane x=75, perpendicular to the length axis. The tip plane x=0 is 75 mm toward the nose from C. - name: D description: Body-top plane z=12 between the tabs; distinguishes nominal bridge height from the z=12.5 measurement ridges. envelope: min: [0, 0, 0] max: [75, 5, 12.5] tolerance: 0.02 parameters: - name: overallLength value: 75 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "75".' description: Tip plane to far end along x. - name: bodyWidth value: 5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "5" (plan width).' description: Distance between the two parallel long side planes y=0 and y=5. - name: bodyHeight value: 12 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "12" (elevation).' description: Build plane to the flat body top, excluding tabs. edit_test: delta: 1 expect: volume_delta: 368.75 direction: increase tolerance_rel: 0.01 bbox_delta: [0, 0, 1] - name: noseLength value: 2.5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "2.5" (plan nose).' description: Axial extent of the symmetric plan taper; shoulder at x=2.5. - name: legStraightHeight value: 5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "5" (lower elevation).' description: Height at the low-x end of each sloping gap ceiling. - name: overhangRise value: 2 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "2" (vertical rise).' description: Rise across each 2 mm wide gap, from z=5 to z=7. - name: gapWidth value: 2 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "2" (horizontal gap).' description: Clear gap along x below the start of the overhang. - name: wideLegWidth value: 5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "5" (far-end leg).' description: Base width along x of L1, L4, L7 and L10. - name: mediumLegWidth value: 2.5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "2.5" (elevation leg).' description: Base width along x of L3, L6, L9 and L12. - name: thinLegWidth value: 0.5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "0.5" (elevation leg).' description: Base width along x of L2, L5, L8 and L11. - name: legPatternPitch value: 14 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "14".' description: Repeat along x containing three gaps and one leg of each width. - name: tabWidth value: 1 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "1" (plan).' description: Each transverse top tab occupies 1 mm along x and the full body width. - name: tabPitch value: 7 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "7" (plan).' description: Pitch between corresponding tab edges along x. - name: tabHeight value: 0.5 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "0.5" (upper elevation).' description: Projection above bodyHeight; the drawing gives 12.5 mm total height. edit_test: delta: 0.25 expect: volume_delta: 13.75 direction: increase tolerance_rel: 0.01 bbox_delta: [0, 0, 0.25] - name: cavityLength value: 4 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "4" (thin-wall inset, elevation).' description: Clear L10 cavity length along x before adding internal walls. - name: baseThickness value: 1 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "1.0" (thin-wall inset, elevation).' description: L10 sealed base extends from z=0 to z=1. - name: thinWallHeight value: 4 unit: mm provenance: stated tolerance: 0.01 source: 'sources/nist-figure3-drawing.png: dimension label "4.0" (thin-wall inset, elevation).' description: Internal walls extend from z=1 to the flat cavity ceiling at z=5. - name: noseAngle value: 45 unit: deg provenance: stated tolerance: 0.1 source: 'sources/nist-figure3-drawing.png: "45°" at the pointed plan end.' description: Angle of each taper flank to x in plan; included apex angle is 90 degrees. - name: overhangAngle value: 45 unit: deg provenance: stated tolerance: 0.1 source: 'sources/nist-figure3-drawing.png: "45°" in elevation; sources/nist-amb2022-01-description.md §2.1.3: "45° overhangs".' description: Inclination of the gap ceiling in the x-z plane. - name: legCount value: 12 unit: '' provenance: stated tolerance: 0.01 source: 'sources/nist-amb2022-01-description.md §1: "12 legs of varying size".' description: Twelve numbered legs; the tall solid end block is additional. - name: tabCount value: 11 unit: '' provenance: stated tolerance: 0.01 source: 'sources/nist-amb2022-01-description.md §2.3: "The 11 tabs on top".' description: Eleven full-width tabs; the final tab ends flush with x=75. - name: outerWallThickness value: 0.5 unit: mm provenance: stated tolerance: 0.1 source: 'sources/nist-amb2022-01-description.md §2.1.3: "outer walls of the L10 leg are approximately 0.5 mm thick".' description: Nominal thickness of all four vertical outer walls of L10; approximate wording retained. - name: thinWallCount value: 4 unit: '' provenance: stated tolerance: 0.01 source: 'sources/nist-amb2022-01-description.md §2.1.3: "a hollow cavity with four thin-wall structures".' description: Four internal partitions, creating five enclosed void compartments. - name: singleWallCount value: 2 unit: '' provenance: stated tolerance: 0.01 source: 'sources/nist-amb2022-01-description.md §2.1.3: "two thin walls that are the width of a single laser track".' description: Two single-track-equivalent solid partitions. - name: doubleWallCount value: 2 unit: '' provenance: stated tolerance: 0.01 source: 'sources/nist-amb2022-01-description.md §2.1.3: "another two that are the width of a double laser track".' description: Two double-track-equivalent solid partitions, each treated as one merged wall. - name: overallHeight value: 12.5 unit: mm provenance: derived tolerance: 0.01 formula: bodyHeight + tabHeight description: Maximum z at the tab tops. - name: legMergeHeight value: 7 unit: mm provenance: derived tolerance: 0.01 formula: legStraightHeight + overhangRise description: All inter-leg gaps close at z=7; agrees with Layer 175 in the text. - name: legPatternCount value: 4 unit: '' provenance: derived tolerance: 0.01 formula: legCount / 3 description: Four repeats; each has three leg widths and three gaps. - name: endBlockLength value: 19 unit: mm provenance: derived tolerance: 0.01 formula: overallLength - legPatternCount * legPatternPitch description: Extent to the low-x edge of the first underside gap, including the 2.5 mm nose. - name: firstTabX value: 4 unit: mm provenance: derived tolerance: 0.01 formula: overallLength - tabWidth - (tabCount - 1) * tabPitch description: Low-x edge of the first tab; all tabs are anchored to the far end. - name: l10StartX value: 28 unit: mm provenance: derived tolerance: 0.01 formula: overallLength - wideLegWidth - 3 * legPatternPitch description: Low-x base edge of L10, the fourth wide leg counted back from L1. - name: cavityStartX value: 28.5 unit: mm provenance: derived tolerance: 0.01 formula: l10StartX + outerWallThickness description: Low-x inner wall face of the L10 cavity. - name: cavityWidth value: 4 unit: mm provenance: derived tolerance: 0.2 formula: bodyWidth - 2 * outerWallThickness description: Clear transverse cavity span y=0.5 to 4.5 before partitions. - name: cavityCeilingZ value: 5 unit: mm provenance: derived tolerance: 0.01 formula: baseThickness + thinWallHeight description: Flat downward-facing ceiling of all five sealed pockets. - name: singleWall1Y value: 1.3 unit: mm provenance: measured tolerance: 0.15 source: 'sources/nist-figure4-legs-thinwalls.png: native 3900 x 1771 pixels, gold line centers in columns u=1650:1700; single track center v=1357. Cavity transition midpoints v=1502.25 (low y), 776.75 (high y). Read y=0.5+4*(1502.25-v)/725.5 mm and round to 0.05 mm; see brief §4.' description: Transverse centerline in the contract frame; approximate scan-schematic reading, not a dimensioned finished-wall location. - name: doubleWall1Y value: 2.05 unit: mm provenance: measured tolerance: 0.15 source: 'sources/nist-figure4-legs-thinwalls.png: native 3900 x 1771 pixels, gold line centers in columns u=1650:1700; double track centers v=1211 and 1232; mean 1221.5. Cavity transition midpoints v=1502.25 (low y), 776.75 (high y). Read y=0.5+4*(1502.25-v)/725.5 mm and round to 0.05 mm; see brief §4.' description: Transverse centerline in the contract frame; approximate scan-schematic reading, not a dimensioned finished-wall location. - name: singleWall2Y value: 2.9 unit: mm provenance: measured tolerance: 0.15 source: 'sources/nist-figure4-legs-thinwalls.png: native 3900 x 1771 pixels, gold line centers in columns u=1650:1700; single track center v=1068. Cavity transition midpoints v=1502.25 (low y), 776.75 (high y). Read y=0.5+4*(1502.25-v)/725.5 mm and round to 0.05 mm; see brief §4.' description: Transverse centerline in the contract frame; approximate scan-schematic reading, not a dimensioned finished-wall location. - name: doubleWall2Y value: 3.65 unit: mm provenance: measured tolerance: 0.15 source: 'sources/nist-figure4-legs-thinwalls.png: native 3900 x 1771 pixels, gold line centers in columns u=1650:1700; double track centers v=922 and 944; mean 933. Cavity transition midpoints v=1502.25 (low y), 776.75 (high y). Read y=0.5+4*(1502.25-v)/725.5 mm and round to 0.05 mm; see brief §4.' description: Transverse centerline in the contract frame; approximate scan-schematic reading, not a dimensioned finished-wall location. - name: singleWallWidth value: 0.1 unit: mm provenance: inferred tolerance: 0.075 rationale: Undocumented. Provisional 0.10 mm uses only the order-of-magnitude laser spot diameter stated in the supplied description; spot size is not a measurement of the finished wall. Keep editable and replace when documented. The wide tolerance is deliberate. description: Nominal rectangular width across y of each single-track internal wall. edit_test: delta: 0.05 expect: volume_delta: 1.6 direction: increase tolerance_rel: 0.01 bbox_delta: [0, 0, 0] - name: doubleWallWidth value: 0.2 unit: mm provenance: inferred tolerance: 0.15 rationale: Undocumented. Provisional 0.20 mm is twice the nominal single-track assumption, used as one continuous equivalent wall. Actual track separation, overlap, and melt-pool width are unknown. This is an independent inferred parameter, not a derived formula. description: Nominal rectangular width across y of each merged double-track internal wall. features: - id: taperedNose kind: profile description: Symmetric pentagonal footprint [(0,bodyWidth/2),(noseLength,0),(overallLength,0),(overallLength,bodyWidth),(noseLength,bodyWidth)], extruded to bodyHeight. The nose is a full-height vertical wedge in plan, not a height taper. Enforce 2*noseLength*tan(noseAngle)=bodyWidth. parameters: - overallLength - bodyWidth - bodyHeight - noseLength - noseAngle verify: - method: bbox - method: solid points: - [0.5, 2.5, 6] - [2, 1, 6] note: '' - method: void points: - [0.5, 0.5, 6] - [0.5, 4.5, 6] note: '' - method: section section: solidBridge note: '' optional: false - id: solidEndBlock kind: extrude description: Full-height solid block from the tapered nose through x=endBlockLength=19, before the first gap; it is not numbered as a leg. Its shoulder is x=2.5. parameters: - endBlockLength - noseLength - bodyWidth - bodyHeight verify: - method: solid points: - [10, 2.5, 0.5] - [18.5, 2.5, 4] - [10, 2.5, 11] note: '' - method: face face: buildContactEndBlock - method: section section: legBases note: '' optional: false - id: solidBridge kind: extrude description: Continuous material across the full pentagonal footprint from legMergeHeight=7 to bodyHeight=12; connects all legs, the end block, tabs, and L10 partitions into one solid. parameters: - overallLength - bodyWidth - bodyHeight - legMergeHeight verify: - method: section section: solidBridge note: '' - method: count section: solidBridge count: 1 note: One outer section loop above every overhang. - method: solid points: - [20, 2.5, 8] - [50, 2.5, 8] - [74.5, 2.5, 8] note: '' - method: face face: farEnd - method: face face: sideY0 - method: face face: sideY5 optional: false - id: legPattern kind: pattern description: Four 14 mm repeats. At b=endBlockLength+k*legPatternPitch (k=0..3), +x order is gap, medium leg, gap, thin leg, gap, wide leg. Enforce legPatternPitch=3*gapWidth+mediumLegWidth+thinLegWidth+wideLegWidth, integer legCount=3*legPatternCount. Leg labels decrease toward +x; L1 is at the far end. parameters: - legCount - legPatternCount - legPatternPitch - endBlockLength - gapWidth - mediumLegWidth - thinLegWidth - wideLegWidth verify: - method: section section: legBases note: '' - method: count section: legBases count: 13 note: Twelve numbered legs plus the separate end-block footprint; this is a section count, not the global solid count. optional: false count: 12 - id: wideLegs kind: extrude description: 'Base intervals along x: L1=[70,75], L4=[56,61], L7=[42,47], L10=[28,33] mm. Each spans y=0..bodyWidth; L10 alone has the documented sealed internal structure.' parameters: - wideLegWidth - bodyWidth - legStraightHeight - legPatternPitch verify: - method: solid points: - [72.5, 2.5, 0.5] - [58.5, 2.5, 0.5] - [44.5, 2.5, 0.5] - [30.5, 2.5, 0.5] note: '' - method: face face: buildContactL01 - method: face face: buildContactL04 - method: face face: buildContactL07 - method: face face: buildContactL10 optional: false count: 4 - id: mediumLegs kind: extrude description: 'Base intervals along x: L3=[63,65.5], L6=[49,51.5], L9=[35,37.5], L12=[21,23.5] mm. Each spans y=0..bodyWidth; L10 alone has the documented sealed internal structure.' parameters: - mediumLegWidth - bodyWidth - legStraightHeight - legPatternPitch verify: - method: solid points: - [64.25, 2.5, 0.5] - [50.25, 2.5, 0.5] - [36.25, 2.5, 0.5] - [22.25, 2.5, 0.5] note: '' - method: face face: buildContactL03 - method: face face: buildContactL06 - method: face face: buildContactL09 - method: face face: buildContactL12 optional: false count: 4 - id: thinLegs kind: extrude description: 'Base intervals along x: L2=[67.5,68], L5=[53.5,54], L8=[39.5,40], L11=[25.5,26] mm. Each spans y=0..bodyWidth; L10 alone has the documented sealed internal structure.' parameters: - thinLegWidth - bodyWidth - legStraightHeight - legPatternPitch verify: - method: solid points: - [67.75, 2.5, 0.5] - [53.75, 2.5, 0.5] - [39.75, 2.5, 0.5] - [25.75, 2.5, 0.5] note: '' - method: face face: buildContactL02 - method: face face: buildContactL05 - method: face face: buildContactL08 - method: face face: buildContactL11 optional: false count: 4 - id: interLegGaps kind: cut description: Twelve full-width underside voids. For b=endBlockLength+k*legPatternPitch, gap low-x edges are a=b+[0, gapWidth+mediumLegWidth, 2*gapWidth+mediumLegWidth+thinLegWidth]. In the x-z plane remove polygon [(a,0),(a+gapWidth,0),(a+gapWidth,legMergeHeight),(a,legStraightHeight)] across y=0..bodyWidth. At nominal size the a list is [19,23.5,26,33,37.5,40,47,51.5,54,61,65.5,68]. parameters: - endBlockLength - legPatternPitch - legPatternCount - gapWidth - mediumLegWidth - thinLegWidth - legStraightHeight - legMergeHeight - bodyWidth verify: - method: void points: - [20, 2.5, 2.5] - [24.5, 2.5, 2.5] - [27, 2.5, 2.5] - [34, 2.5, 2.5] - [38.5, 2.5, 2.5] - [41, 2.5, 2.5] - [48, 2.5, 2.5] - [52.5, 2.5, 2.5] - [55, 2.5, 2.5] - [62, 2.5, 2.5] - [66.5, 2.5, 2.5] - [69, 2.5, 2.5] note: '' - method: section section: longitudinalCavity note: '' - method: section section: legBases note: '' optional: false count: 12 - id: overhangs kind: profile description: 'Every gap ceiling rises toward +x: z=legStraightHeight+(x-a)*overhangRise/gapWidth. It starts at (a,5) and ends at (a+2,7); do not substitute a symmetric arch or reverse the slope. Enforce tan(overhangAngle)=overhangRise/gapWidth.' parameters: - overhangRise - overhangAngle - gapWidth - legStraightHeight - legMergeHeight verify: - method: solid points: - [19.5, 2.5, 6] - [24.0, 2.5, 6] - [26.5, 2.5, 6] - [33.5, 2.5, 6] - [38.0, 2.5, 6] - [40.5, 2.5, 6] - [47.5, 2.5, 6] - [52.0, 2.5, 6] - [54.5, 2.5, 6] - [61.5, 2.5, 6] - [66.0, 2.5, 6] - [68.5, 2.5, 6] note: '' - method: void points: - [20.5, 2.5, 6] - [25.0, 2.5, 6] - [27.5, 2.5, 6] - [34.5, 2.5, 6] - [39.0, 2.5, 6] - [41.5, 2.5, 6] - [48.5, 2.5, 6] - [53.0, 2.5, 6] - [55.5, 2.5, 6] - [62.5, 2.5, 6] - [67.0, 2.5, 6] - [69.5, 2.5, 6] note: '' - method: section section: overhangMid note: '' - method: section section: solidBridge note: '' optional: false count: 12 - id: topTabs kind: pattern description: Eleven rectangular full-width tabs at x=[firstTabX+i*tabPitch, firstTabX+i*tabPitch+tabWidth], i=0..10, z=bodyHeight..overallHeight. Nominal starts are 4,11,18,25,32,39,46,53,60,67,74 mm; tab 11 ends flush at x=75. Preserve as-designed height; no skim-cut allowance is given. parameters: - tabCount - firstTabX - tabPitch - tabWidth - tabHeight - bodyWidth - bodyHeight - overallHeight verify: - method: section section: topTabs note: '' - method: count section: topTabs count: 11 - method: solid points: - [4.5, 2.5, 12.25] - [11.5, 2.5, 12.25] - [18.5, 2.5, 12.25] - [25.5, 2.5, 12.25] - [32.5, 2.5, 12.25] - [39.5, 2.5, 12.25] - [46.5, 2.5, 12.25] - [53.5, 2.5, 12.25] - [60.5, 2.5, 12.25] - [67.5, 2.5, 12.25] - [74.5, 2.5, 12.25] note: '' - method: void points: - [8, 2.5, 12.25] - [71, 2.5, 12.25] note: '' - method: face face: tabTop01 - method: face face: tabTop02 - method: face face: tabTop03 - method: face face: tabTop04 - method: face face: tabTop05 - method: face face: tabTop06 - method: face face: tabTop07 - method: face face: tabTop08 - method: face face: tabTop09 - method: face face: tabTop10 - method: face face: tabTop11 optional: false count: 11 - id: l10ShellAndBase kind: shell description: Only L10, x=28..33, has four nominal 0.5 mm vertical outer walls and a 1 mm full square base. Cavity x extent is centered and must satisfy wideLegWidth=cavityLength+2*outerWallThickness. Outer skin is closed on both long sides. parameters: - l10StartX - wideLegWidth - bodyWidth - outerWallThickness - baseThickness - cavityLength - cavityStartX - cavityWidth verify: - method: solid points: - [28.25, 2.5, 3] - [32.75, 2.5, 3] - [30.5, 0.25, 3] - [30.5, 4.75, 3] - [30.5, 2.5, 0.5] note: '' - method: section section: l10Transverse note: '' - method: face face: buildContactL10 optional: false - id: l10SealedPockets kind: cavity description: Subtract the parent cavity x=[cavityStartX,cavityStartX+cavityLength], y=[outerWallThickness,outerWallThickness+cavityWidth], z=[baseThickness,cavityCeilingZ], retaining the four spanning partitions. Final result has five mutually separate sealed void compartments, not an opening through an external side or roof. Nominal clear y intervals are [0.5,1.25], [1.35,1.95], [2.15,2.85], [2.95,3.55], [3.75,4.5]. parameters: - cavityStartX - cavityLength - cavityWidth - outerWallThickness - baseThickness - cavityCeilingZ - thinWallCount verify: - method: void points: - [30.5, 0.875, 3] - [30.5, 1.65, 3] - [30.5, 2.5, 3] - [30.5, 3.25, 3] - [30.5, 4.125, 3] note: '' - method: section section: l10Interior note: '' - method: section section: l10Transverse note: '' - method: section section: longitudinalCavity note: '' optional: false count: 5 - id: singleTrackWalls kind: wall description: Two ideal rectangular partitions parallel to x at y=singleWall1Y and singleWall2Y, each of width singleWallWidth. They span the full cavityLength and join the two x-end walls, base, and ceiling. Width is explicitly inferred; centerlines are approximate image measurements. parameters: - singleWallCount - singleWallWidth - singleWall1Y - singleWall2Y - cavityStartX - cavityLength - baseThickness - thinWallHeight verify: - method: solid points: - [30.5, 1.3, 3] - [30.5, 2.9, 3] - [28.6, 1.3, 3] - [32.4, 2.9, 3] note: '' - method: section section: l10Transverse note: '' - method: section section: l10Interior note: '' optional: false count: 2 - id: doubleTrackWalls kind: wall description: Two continuous ideal rectangular partitions parallel to x at y=doubleWall1Y and doubleWall2Y, each of width doubleWallWidth. Each double-track member is one merged wall, not two independent ribs. It joins both x-end walls, base and ceiling. Width is inferred. parameters: - doubleWallCount - doubleWallWidth - doubleWall1Y - doubleWall2Y - cavityStartX - cavityLength - baseThickness - thinWallHeight verify: - method: solid points: - [30.5, 2.05, 3] - [30.5, 3.65, 3] - [28.6, 2.05, 3] - [32.4, 3.65, 3] note: '' - method: section section: l10Transverse note: '' - method: section section: l10Interior note: '' optional: false count: 2 - id: l10FlatCeiling kind: profile description: All five L10 pocket roofs are horizontal at z=cavityCeilingZ=5; material continues immediately above. Internal wall height is 4 mm above the 1 mm base. There is no additional undocumented roof-thickness parameter or internal sloping roof. parameters: - baseThickness - thinWallHeight - cavityCeilingZ - bodyHeight verify: - method: solid points: - [30.5, 0.875, 5.25] - [30.5, 1.65, 5.25] - [30.5, 2.5, 5.25] - [30.5, 3.25, 5.25] - [30.5, 4.125, 5.25] note: '' - method: void points: - [30.5, 0.875, 4.75] - [30.5, 1.65, 4.75] - [30.5, 2.5, 4.75] - [30.5, 3.25, 4.75] - [30.5, 4.125, 4.75] note: '' - method: section section: l10Transverse note: '' - method: section section: aboveCavity note: '' optional: false interfaces: - name: buildPlateContacts description: 'Name all 13 downward contact patches: buildContactEndBlock and buildContactL01 through buildContactL12. Use for build-plane constraints; no plate solid is included.' must_not_change: true - name: displacementTabTops description: Name tabTop01 through tabTop11 in increasing x order, for displacement measurements. Nominal top plane z=12.5; tab origins are 4+7*i. No skim-cut stock removal is specified. must_not_change: true - name: frameSideAndEndFaces description: sideY0, sideY5, and farEnd locate the contract frame. Distinguish same-area faces using the x intervals in the brief; plane and area alone cannot uniquely identify repeated tabs or feet. must_not_change: true - name: editableDeliverables description: 'Later deliverables: editable parameterized KCL construction, one connected solid, deterministic STEP and an STL tessellation. No STEP/STL/reference imports in construction. This draft stage writes only contract.yaml and brief.md.' must_not_change: true acceptance: bbox_tolerance: 0.02 volume: expected: 3678.1 tolerance_rel: 0.003 provenance: derived note: 'Nominal ideal geometry, conditional on the two inferred track widths. Define A=bodyWidth*(overallLength-noseLength/2), G=gapWidth*(legStraightHeight+overhangRise/2), T=singleWallCount*singleWallWidth+doubleWallCount*doubleWallWidth, Vb=A*bodyHeight, Vg=bodyWidth*G (one gap), Vt=tabCount*tabWidth*bodyWidth*tabHeight, Vc=cavityLength*cavityWidth*thinWallHeight, and Vw=cavityLength*thinWallHeight*T. V=Vb-legCount*Vg+Vt-Vc+Vw=4425-720+27.5-64+9.6=3678.1 mm^3. Center-of-mass formulas are recorded here because the schema''s center_of_mass type has no note field. Let a_j be the gap starts listed in interLegGaps. xb=(bodyWidth*overallLength^2/2-bodyWidth*noseLength^2/6)/A; dxg=gapWidth*(legStraightHeight/2+overhangRise/3)/(legStraightHeight+overhangRise/2); zg=(legStraightHeight^2+legStraightHeight*overhangRise+overhangRise^2/3)/(2*(legStraightHeight+overhangRise/2)); xt=firstTabX+(tabCount-1)*tabPitch/2+tabWidth/2; xc=cavityStartX+cavityLength/2; zc=baseThickness+thinWallHeight/2. Mx=Vb*xb-Vg*sum(a_j+dxg)+Vt*xt-(Vc-Vw)*xc. My=(Vb-legCount*Vg+Vt-Vc)*bodyWidth/2+cavityLength*thinWallHeight*(singleWallWidth*(singleWall1Y+singleWall2Y)+doubleWallWidth*(doubleWall1Y+doubleWall2Y)). Mz=Vb*bodyHeight/2-legCount*Vg*zg+Vt*(bodyHeight+tabHeight/2)-(Vc-Vw)*zc. COM=[Mx,My,Mz]/V. Nominal first moments are [135794.55,9196.21,24543.675] mm^4. The small +y offset follows the measured alternating-wall placement; do not force symmetry.' surface_area: expected: 3384.458441227 tolerance_rel: 0.005 provenance: derived note: Includes all external faces and all five sealed-pocket boundaries. A and G as in volume.note; P=2*(overallLength-noseLength)+bodyWidth+2*sqrt(noseLength^2+(bodyWidth/2)^2). External S=2*A+bodyHeight*P+legCount*(-gapWidth*bodyWidth-2*G+bodyWidth*(2*legStraightHeight+overhangRise+sqrt(gapWidth^2+overhangRise^2)))+2*tabCount*(tabWidth+bodyWidth)*tabHeight=3170.058441227 mm^2. Let C=cavityLength, D=cavityWidth, J=thinWallHeight and T as in volume.note. Internal S=2*((C+J)*(D-T)+(thinWallCount+1)*C*J)=214.4 mm^2. Total=3384.458441227 mm^2. Each partition spans both cavity ends and touches floor and ceiling; touching interfaces are not counted as exposed faces. center_of_mass: expected: [36.919754765, 2.500261004, 6.672922161] tolerance: 0.05 provenance: derived solid_count: 1 sections: - id: legBases plane: z at: 0.5 expect: area: 248.75 area_tolerance_rel: 0.002 loops: 13 holes: 0 description: 'Below the L10 base top: 12 numbered leg islands plus the solid end block. A=bodyWidth*(overallLength-noseLength/2-legCount*gapWidth).' - id: l10Interior plane: z at: 3 expect: area: 235.15 area_tolerance_rel: 0.01 loops: 13 holes: 5 description: 'Through all four internal walls: 13 outer loops and five holes in the L10 island. A=legBases area-cavityLength*(cavityWidth-2*singleWallWidth-2*doubleWallWidth).' - id: l10Transverse plane: x at: 30.5 expect: area: 46.4 area_tolerance_rel: 0.05 loops: 1 holes: 5 description: Central y-z section of L10, away from tabs. A=bodyWidth*bodyHeight-thinWallHeight*(cavityWidth-2*singleWallWidth-2*doubleWallWidth). Checks the 1 mm base, four 4 mm walls, and flat z=5 roof. - id: longitudinalCavity plane: y at: 2.5 expect: area: 745.5 area_tolerance_rel: 0.002 loops: 1 holes: 1 description: x-z mid-width section passes through the middle sealed pocket, between internal walls. A=overallLength*bodyHeight-legCount*gapWidth*(legStraightHeight+overhangRise/2)+tabCount*tabWidth*tabHeight-cavityLength*thinWallHeight. - id: aboveCavity plane: z at: 5.25 expect: area: 263.75 area_tolerance_rel: 0.002 loops: 13 holes: 0 description: Just above the sealed roof; all cavity holes have disappeared. A=footprint area-legCount*bodyWidth*gapWidth*(legMergeHeight-5.25)/overhangRise. - id: overhangMid plane: z at: 6 expect: area: 308.75 area_tolerance_rel: 0.002 loops: 13 holes: 0 description: At half the overhang rise each remaining gap is 1 mm wide; slope probes distinguish direction. A=footprint area-legCount*bodyWidth*gapWidth/2. - id: solidBridge plane: z at: 8 expect: area: 368.75 area_tolerance_rel: 0.001 loops: 1 holes: 0 description: 'Above the 7 mm merge plane and below tabs: full pentagonal footprint. A=bodyWidth*(overallLength-noseLength/2).' - id: topTabs plane: z at: 12.25 expect: area: 55 area_tolerance_rel: 0.002 loops: 11 holes: 0 description: Eleven separate tab sections, full 5 mm width. A=tabCount*tabWidth*bodyWidth. faces: - name: buildContactEndBlock plane: z at: 0 normal: '-' area: 88.75 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL01 plane: z at: 0 normal: '-' area: 25 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL02 plane: z at: 0 normal: '-' area: 2.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL03 plane: z at: 0 normal: '-' area: 12.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL04 plane: z at: 0 normal: '-' area: 25 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL05 plane: z at: 0 normal: '-' area: 2.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL06 plane: z at: 0 normal: '-' area: 12.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL07 plane: z at: 0 normal: '-' area: 25 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL08 plane: z at: 0 normal: '-' area: 2.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL09 plane: z at: 0 normal: '-' area: 12.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL10 plane: z at: 0 normal: '-' area: 25 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL11 plane: z at: 0 normal: '-' area: 2.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: buildContactL12 plane: z at: 0 normal: '-' area: 12.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop01 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop02 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop03 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop04 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop05 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop06 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop07 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop08 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop09 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop10 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: tabTop11 plane: z at: 12.5 normal: + area: 5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: sideY0 plane: y at: 0 normal: '-' area: 731.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: sideY5 plane: y at: 5 normal: + area: 731.5 area_tolerance_rel: 0.002 tolerance: 0.02 - name: farEnd plane: x at: 75 normal: + area: 62.5 area_tolerance_rel: 0.002 tolerance: 0.02 deviation: null blockout: volume_min: 4450 volume_max: 4455 export_volume_tolerance_rel: 0.002 references: - path: sources/nist-amb2022-01-description.md kind: text role: authoritative sha256: ad20b8b64ceffc5122b055fd97c5e12b4b89b3cd2d52876ba74afb4d66cf2094 units: mm; deg for angles revision: Geometry excerpts; NIST page inspected 2026-09-15 note: Supplied local geometry description, counts, L10 construction, and LPBF context. External dimensions defer to Figure 3. The text says recoating proceeds left; the supplied frame and Figure 3 arrow fix +x toward the far end. - path: sources/nist-figure3-drawing.png kind: drawing role: authoritative sha256: a2377f44a5d37ee5e2193817bc33f079d664fae8c9df7bd675480f9e97b37d49 units: mm; deg for angles revision: NIST Figure 3; updated 2023-09-20; supplied copy inspected 2026-09-15 note: Authoritative for every external dimension. Native image 3127 x 1821 pixels; explicit labels outrank raster scaling. - path: sources/nist-figure4-legs-thinwalls.png kind: image role: authoritative sha256: a55dce91299778420a4970d51478be5856a89b291644459d93b7cb71524b7417 units: mm; deg for angles revision: NIST Figure 4; revision not stated; supplied copy inspected 2026-09-15 note: Leg numbering and internal-wall topology; scan-path centerlines support only approximate transverse placements. Native image 3900 x 1771 pixels. Stroke width is not a finished-wall dimension. - path: sources/nist-figure1-overview.png kind: image role: illustrative sha256: 8cfc5aa92c73cb51cae87d1238b865d1c33565d5757e27244c19eb1e90e62142 units: mm; deg for angles revision: NIST Figure 1; revision not stated; supplied copy inspected 2026-09-15 note: Native image 3448 x 1708 pixels. Qualitative perspective check of leg labels, 14 mm repeats, pointed end, tabs, and hollow L10; no dimensional measurement from perspective. open_questions: - What are the nominal finished CAD widths of the single-track and double-track internal walls? They are not dimensioned. Pending documentation, singleWallWidth=0.10 mm (tolerance 0.075 mm) and doubleWallWidth=0.20 mm (tolerance 0.15 mm) are inferred rectangular merged-wall equivalents; laser spot diameter does not establish wall thickness. - Can NIST provide the exact transverse centerlines and end-junction profiles of the four L10 walls? Figure 4 gives approximate +y order single, double, single, double at y=1.30, 2.05, 2.90, 3.65 mm (each tolerance 0.15 mm). The scan schematic does not fix finished bead or junction profiles. - Which alloy and density apply to this individual artifact if a mass result is required? The supplied geometry excerpt gives neither; material and density remain null.