Source: https://guthlabs.ai/docs/instruments/bearing-l10-life-calculator/implementation/

instrument implementation / implementation-contract

# Bearing L10 Life Calculator implementation

A source-bound implementation contract for Bearing L10 Life Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-020

**Effect**: Computation or source lookup only

## Input and validation requirements

The stated L10h formula multiplies L10 by 10^6 even though L10 is already specified in revolutions, producing a result one million times too large; the calculator also needs validation for P=0 and a defined convention or rejection for negative speed.

## 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": {
    "C": 10000,
    "P": 2000,
    "force_unit": "N",
    "bearing_type": "ball",
    "N": 1200,
    "speed_unit": "rpm"
  },
  "expected_outputs": {
    "L10_revolutions": 125000000,
    "L10h_hours": 1736.1111111111
  },
  "working": "p=3. C/P=10000/2000=5. (C/P)^p=5^3=125. L10=125×10^6=125,000,000 revolutions. L10h=125,000,000/(60×1200)=125,000,000/72,000=1,736.1111111111 hours."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bearing-l10-life-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/bearing-l10-life-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/bearing-l10-life-calculator/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`