Source: https://guthlabs.ai/docs/instruments/gear-ratio-train-calculator/qualification/

instrument qualification / verified-with-binding-errata

# Gear Ratio & Train Calculator qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-4

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

No tranche erratum is attached to this unique-name record.

### Stress-test correction

````
{
  "vector_inputs": {
    "input_pitch_diameter": "2 in",
    "output_pitch_diameter": "5 in",
    "input_speed": "1800 rpm",
    "input_torque": "18.439 lbf·ft"
  },
  "wrong_outputs": {
    "overall_speed_ratio": 0.4,
    "output_speed": "720 rpm",
    "output_speed_SI": "75.3982 rad/s",
    "output_torque": "7.3756 lbf·ft",
    "output_torque_SI": "10.0000 N·m"
  },
  "corrected_outputs": {
    "overall_speed_ratio": 0.4,
    "output_speed": "720 rpm",
    "output_speed_SI": "75.3982 rad/s",
    "output_torque": 46.0975,
    "output_torque_SI": 62.4998
  },
  "method": "power conservation: P_in=P_out => T_out = T_in / speed_ratio = 18.439/0.4 = 46.0975 lbf·ft = 62.4998 N·m"
}
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/gear-ratio-train-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/gear-ratio-train-calculator/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/gear-ratio-train-calculator/implementation/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `STRESS_TEST_CORRECTIONS_APPLIED.json`