How to distinguish and verify repeatability versus absolute accuracy in a robot procurement spec?
• Repeatability is the scatter of repeated moves to one point; ISO 9283 uses 30 cycles at ±3σ.
• Absolute accuracy is the deviation between taught and actual point, typically 5-10x worse.
• Welding/dispensing needs ±0.05mm repeatability; offline programming needs ±0.5mm absolute accuracy.
• Verify with a laser tracker per ISO 9283; do not accept datasheet claims alone.
• List both metrics and test standards separately in the contract to avoid term confusion.
• Absolute accuracy is the deviation between taught and actual point, typically 5-10x worse.
• Welding/dispensing needs ±0.05mm repeatability; offline programming needs ±0.5mm absolute accuracy.
• Verify with a laser tracker per ISO 9283; do not accept datasheet claims alone.
• List both metrics and test standards separately in the contract to avoid term confusion.