[544] Absolute Accuracy
Product Specification RobotWare Options for BaseWare OS 4.0 5
2 BaseWare Options
[544] Absolute Accuracy
Absolute Accuracy (AbsAcc) is a calibration concept, which ensures a TCP absolute
accuracy of better than ±1 mm in the entire working range.
The user is supplied with robot calibration data (error parameter file) and a certificate
that shows the performance (Birth Certificate).
The difference between an ideal robot and a real robot can be typically 8 mm, resulting
from mechanical tolerances and deflection in the robot structure. Absolute Accuracy
option is integrated in the controller algorithms for compensation of this difference,
and does not need external equipment or calculation.
Features
• Compensation of mechanical tolerances.
• Compensation of deflection due to load (tool, object and equipment on arm).
Applications
Any application where Absolute Accuracy is needed to facilitate:
- Exchangeability of robots
- Off-line programming with minimum touch-up.
- On-line programming with accurate linear movement as well as accurate
reorientation of tool
- Re-use of programs between applications
Controller algorithms
Inherent mechanical tolerances and deflection due to load in the robot structure
decrease the robot’s absolute accuracy. Practical compensation of such errors is a
complex and highly non-linear problem. The ABB solution is to compensate positions
internally in the controller, resulting in a defined and measurable robot TCP (Tool
Center Point) accuracy. A generic robot control model is used for each robot family and
robot individuals are described by a set of error parameters, generated during
calibration at ABB Automation Technology Products, Robotics. Accuracy of each
robot will be ascertained and verified through the “Birth Certificate” which statistically
describes the robot accuracy in a large sample of robot positions.
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