Section 01 · 5 entries
Repeatability
Returning to the same point, not the right one.
5 entries
In reading order- 01Repeatability is not accuracyAn arm quoted at ±0.03 mm will return to the same wrong place all day. Repeatability is agreement with itself; accuracy is agreement with the world, and almost every published figure is the first one.
- 02What the figure excludesQuoted cold, unloaded, at rated speed. Three conditions no production cell meets.
- 03Thermal growthSteel grows as the cell warms. The first hour of a shift is not the fourth.
- 04Payload and droopMass at the wrist bends the arm. The number falls as the load rises.
- 05CalibrationMeasuring the arm against a known artefact to turn repeatability into accuracy.