Flanged cap with bolt circle A · A2 · a2-flanged-cap-01

flange · bolt-circle · axisymmetric · multi-hole

Prompt

Make a circular flanged cap. Outer cylinder: outside diameter 60mm, height 8mm, axis along Z, base on the XY plane (z = 0 to z = 8). Concentric central through-hole of diameter 40mm, axis along Z. Six bolt holes of diameter 5mm on a 50mm bolt circle (radius 25mm from the axis), evenly spaced starting at 0 degrees, all parallel to Z and going fully through. Output a single solid.

Checks

valid_solid

{
  "type": "valid_solid"
}

bbox

{
  "type": "bbox",
  "min": [
    -30,
    -30,
    0
  ],
  "max": [
    30,
    30,
    8
  ],
  "tolerance_mm": 0.1
}

mass_props

{
  "type": "mass_props",
  "volume_mm3": 11623.89,
  "center_of_mass": [
    0,
    0,
    4
  ],
  "tolerance_pct": 0.5
}

hole_count

{
  "type": "hole_count",
  "diameter_mm": 40,
  "expected": 1,
  "diameter_tolerance_mm": 0.1
}

hole_count

{
  "type": "hole_count",
  "diameter_mm": 5,
  "expected": 6,
  "diameter_tolerance_mm": 0.05
}

hole_positions

{
  "type": "hole_positions",
  "diameter_mm": 5,
  "positions": [
    [
      25,
      0,
      0
    ],
    [
      12.5,
      21.65,
      0
    ],
    [
      -12.5,
      21.65,
      0
    ],
    [
      -25,
      0,
      0
    ],
    [
      -12.5,
      -21.65,
      0
    ],
    [
      12.5,
      -21.65,
      0
    ]
  ],
  "tolerance_mm": 0.15
}

step_roundtrip

{
  "type": "step_roundtrip",
  "tolerance_pct": 1
}

Anti-cheese

{
  "max_solid_count": 1
}

Limits

{
  "max_tokens": 80000,
  "max_wallclock_sec": 360,
  "max_tool_calls": 80
}

Recent attempts

Runs (6)

model	run	status	score	tokens	wall
claude-direct-claude-opus-4-7	20260428T153537Z-97a4	PASS	1.00	2.3k	11.5s
claude-direct-claude-opus-4-7	20260428T153525Z-72cb	PASS	1.00	2.2k	11.7s
claude-direct-claude-opus-4-7	20260428T153513Z-1961	PASS	1.00	2.3k	11.4s
claude-mcp-claude-opus-4-7	20260428T150052Z-bb98	fail	0.43	610.0k	157.7s
claude-direct-claude-opus-4-7	20260428T142511Z-8f59	PASS	1.00	2.1k	10.4s
claude-direct-claude-opus-4-7	20260428T141650Z-bd80	PASS	1.00	2.0k	15.8s

drawing mecheval.	sheet TASK · a2-flanged-cap-01	scale 6 runs
date 2026-04-28	drawn by muni	project mecheval

generated 2026-04-28T21:00:04.649Z · static site, regenerate with npm run build -w @mecheval/leaderboard