Source: https://guthlabs.ai/docs/instruments/bearing-equivalent-dynamic-load-calculator/implementation/

instrument implementation / implementation-contract

# Bearing Equivalent Dynamic Load Calculator implementation

A source-bound implementation contract for Bearing Equivalent Dynamic Load 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**: t7-061

**Effect**: Computation or source lookup only

## Input and validation requirements

The calculator cannot determine the formula branch without the missing bearing type/e-ratio factor tables, and an extreme but representable input combination overflows a typical floating-point implementation. Signed axial input also produces a physically invalid negative result unless the magnitude convention is enforced.

## 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": {
    "bearing_type": "single-row deep-groove ball bearing, 15-degree contact-angle table",
    "Fr": 1000,
    "Fa": 0,
    "Fr_unit": "N",
    "Fa_unit": "N",
    "e": 0.22,
    "X": 1,
    "Y": 0
  },
  "expected_outputs": {
    "P": 1000,
    "P_unit": "N"
  },
  "reference_data": {
    "bearing_table": "single-row deep-groove ball bearing, 15-degree contact-angle factor table",
    "condition": "Fa/Fr <= e",
    "e": 0.22,
    "X": 1,
    "Y": 0,
    "source_convention": "widely tabulated standard value, ISO 281-based bearing-factor convention"
  },
  "working": "Fa/Fr = 0/1000 = 0. Since 0 <= e = 0.22, use X = 1 and Y = 0. P = XFr + YFa = (1)(1000 N) + (0)(0 N) = 1000 N."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/bearing-equivalent-dynamic-load-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/bearing-equivalent-dynamic-load-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/bearing-equivalent-dynamic-load-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-tranche7/tranche7-results.json`