The instrument used for testing is the same as that used for testing positioning accuracy. The general detection method is to measure at any three positions close to the midpoint and both ends of each coordinate stroke, each position is positioned with rapid movement, and the positioning is repeated 7 times under the same conditions, and the stop position value is measured and the reading is larger. value. Take one half of the difference between the larger of the three positions and attach the positive and negative signs as the repeated positioning accuracy of the coordinate, which is a basic indicator reflecting the stability of the axis motion accuracy.
Detection of the return accuracy of the origin of linear motion
The origin return accuracy is essentially the repeated positioning accuracy of a special point on the coordinate axis, so its detection method is completely the same as the repeated positioning accuracy.
Reverse error detection of linear motion
The reverse error of linear motion, also called loss of momentum, includes the reverse dead zone of the driving part (such as servo motor, servo hydraulic motor, stepper motor, etc.) on the coordinate axis feed transmission chain, and each mechanical motion transmission pair A comprehensive reflection of errors such as backlash and elastic deformation. The greater the error, the lower the positioning accuracy and repeat positioning accuracy.
The detection method of the reverse error is to move a distance in the forward or reverse direction in advance within the stroke of the measured coordinate axis and use the stop position as the reference, and then give a certain movement command value in the same direction to make it move a certain distance. Then move the same distance in the opposite direction, and measure the difference between the stop position and the reference position. Perform multiple measurements (generally 7 times) at the three positions near the midpoint and both ends of the stroke, find the average value at each position, and take the larger value of the average value obtained as the reverse error value.