No automatic calibration required
Six measurements. Four anchor locations.
Measure center-to-center between each pair of anchors. The redundant diagonal measurement lets the solver fit all values and estimate measurement consistency.
Measurements
millimetersCalculations stay in this browser. Measure from the center of each anchor attachment point.
solid: fitted frame dashed: diagonals
Computed result
using all 6 measurementsMeasurement quality—
Estimated 1σ error—
Fit RMS—
FluidNC coordinates
Measurement residuals
| Line | Measured | Fit Δ |
|---|
About the error estimate: Four points need five independent planar coordinates after position and rotation are fixed. Six measured distances provide one extra constraint. The reported 1σ value is the least-squares residual estimate from that single degree of freedom, so treat it as a useful consistency check rather than a precision guarantee.