V-Belt Power Rating Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-042

Effect

Computation or source lookup only

Input and validation requirements

The zero correction-factor input produces a division-by-zero undefined result, and the exact-zero power boundary produces a mathematically valid zero-belt result that must be rejected as physically invalid. The specification also leaves the power-sign convention and the integer belt-count branch implicit.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "transmitted_power_kW": 10,
    "service_factor": 1.2,
    "belt_rating_kW_per_belt": 5,
    "wrap_angle_deg": 180,
    "belt_length_mm": 1000
  },
  "expected_outputs": {
    "design_power_kW": 12,
    "uncorrected_belt_count": 2.4,
    "belts_required": 3
  },
  "reference_data": {
    "arc_correction": {
      "wrap_angle_deg": 180,
      "factor": 1,
      "source_convention": "widely tabulated standard value"
    },
    "length_correction": {
      "belt_length_mm": 1000,
      "factor": 1,
      "source_convention": "widely tabulated standard value"
    },
    "belt_rating": {
      "rating_kW_per_belt": 5,
      "source_convention": "widely tabulated standard value"
    }
  },
  "working": "Design power = 10.0 kW × 1.2 = 12.0 kW. Effective rating per belt = 5.0 × 1.0 × 1.0 = 5.0 kW/belt. Real belt count = 12.0 ÷ 5.0 = 2.4 belts. Round up: ceil(2.4) = 3 belts. The 180° wrap and 1.00 length factor are exact table entries."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json