Abstract
Dominant types of errors at parallel kinematics machine tools
Highlights
Parallel kinematics machine tools have attracted the attention of research institutions and industry due to their high theoretical structural rigidity and high accuracy due to the closed kinematic loops and no error accumulating characteristics
In this paper several most dominant errors which have the greatest influence on the parallel kinematics machine tools accuracy will be presented
The stiffness of the struts should be measured before assembling the machine. Thermal errors are another important source that significantly decrease the accuracy of the parallel kinematics machine tools
Summary
Parallel kinematics machine tools have attracted the attention of research institutions and industry due to their high theoretical structural rigidity and high accuracy due to the closed kinematic loops and no error accumulating characteristics. More than 20 have years passed since the first commercial parallel kinematics machine tools were introduced, they are not widely accepted in the industry. -these centres are precisely known, -the linear actuators move with only one degree of freedom and pass exactly through the joint centres, -the leg length can be read without errors, and -no internal and external loads affect the manipulator. These assumptions will fail for a real machine tool due to manufacturing and assembly errors, kinematic errors in the actuators and joints, elastic deformations due to the gravity, thermal deformations, limited sensor accuracy, control errors, etc. In this paper several most dominant errors which have the greatest influence on the parallel kinematics machine tools accuracy will be presented
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