Source: https://guthlabs.ai/docs/instruments/gyroscopic-precession-calculator/mechanism/

instrument mechanism / verified-clean

# Gyroscopic Precession Calculator mechanism

The inspectable method record for Gyroscopic Precession Calculator, kept separate from implementation and qualification.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Model scope

The honest label correctly identifies this as a steady-precession approximation that ignores nutation, but the product needs explicit assumptions or inputs for g, the torque angle, and the spin-axis moment of inertia before the formula can be presented as unambiguous.

- mgr is only the gravitational torque magnitude when the center-of-mass displacement is perpendicular to gravity; the general magnitude is mgr sin(theta), where theta is the angle between r and g.

- Omega=tau/(I omega) is the standard steady-precession approximation only when spin angular momentum dominates, nutation is neglected, and I is the moment of inertia about the spin axis.

- The spec does not define the orientation angle, so it is ambiguous whether r means the full center-of-mass-to-pivot distance or the perpendicular lever arm.

- The gravitational acceleration g is used but is not listed as an input or fixed constant.

## Units and conventions

- Use SI units: mass in kg, r in m, I in kg*m^2, and spin omega in rad/s.

- Use g=9.80665 m/s^2 unless another value is explicitly selected.

- Omega is reported in rad/s; radians are treated as dimensionless in dimensional arithmetic.

- I must be the moment of inertia about the gyroscope's spin axis.

- The tested cases assume the center-of-mass displacement is perpendicular to gravity, so tau=mgr.

## Inspectable vector

One of 4 source-bound review vectors:

````
{
  "inputs": {
    "mass": 1.2,
    "r": 0.08,
    "spin_omega": 120,
    "I": 0.006,
    "units": "kg, m, rad/s, kg*m^2",
    "assumed_angle": "90 degrees",
    "g": 9.80665
  },
  "expected_outputs": {
    "Omega": 1.307553333,
    "Omega_unit": "rad/s"
  },
  "working": "tau=mgr=1.2*9.80665*0.08=0.9414384 N*m. I*omega=0.006*120=0.72 kg*m^2/s. Omega=tau/(I*omega)=0.9414384/0.72=1.307553333 rad/s."
}
````

## Failure boundary

**BREAK_CLAIMED** · SELF_FLAGGED

A zero spin input produces division by zero and must be rejected. The specification also does not define a true piecewise formula branch or unambiguously define sign, unit, and directional conventions.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/gyroscopic-precession-calculator/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/gyroscopic-precession-calculator/implementation/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/gyroscopic-precession-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`

- `BOUNDARY_HAZARD_CATALOG.json`