The factors that cause systematic errors in the measurement process are complex and the mechanisms are varied, so it is often difficult to find all systematic errors. Here are just a few ways to visually find out if the Vibratory Polishing Machine is likely to have systematic errors.
1. Discovery and elimination of fixed system error
The system error of the fixed value cannot be revealed from the processing of the series of measured values, but can only be found by another experimental comparison method. For example, when measuring a certain size with a comparator, the system error due to the gauge size deviation can be found by using a high-precision instrument to verify the actual size of the gauge block, or by using a height gauge instead of a comparative measurement.
In the measurement process, if the sign of the fixed system error can be controlled, the occurrence of the system error of the fixed value is positive once and the other is negative, and then the arithmetic mean of the two readings is taken as the measurement result. For example, when measuring the pitch of the thread on the tool mirror, the system error due to the misalignment between the workpiece mounting axis and the table moving direction can be measured by measuring the pitch of the left and right contours and taking the average value as the pitch. result.
2. The discovery and elimination of variable value system error
By analyzing the magnitude of each residual error in the series of measurements and the change in the sign, it is possible to determine whether there is a systematic error. For example, when the residual error is substantially positive and negative, and there is no tendency to change, then the variable system error cannot be considered (but the possibility of a fixed system error is not excluded). The residual error value is regularly incremented or decremented, and its trend is always constant, then there is a systematic error in linear variation. When the residual error increases and decreases alternately, forming a cyclic repetition, it is considered that there is a periodic systematic error.
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