Because the vernier caliper is a contact measurement, he must be the same axis as the main ruler axis, with the vice ruler axis, with the vertical axis, with the articulation surface, the two ends of the contact stabilization fixed measurement, but in fact there are two kinds of end-to-end surface to have a way to stabilize the fixed, that is to say, the fixed is more than the stability of the actual moment, while the stability of the gauge, so the trapezoidal shape of the vernier caliper can not be really fixed measurement, can only be approximate stable! Close to the measurement, which in the trapezoid on both sides of the bevel has been telling you that the vernier calipers will fail in the degree of fixation, fixation has to target the accuracy, stability can only be close to it.
Small bottom of the most recent method: the internal ruler surface clamped to be measured workpiece to keep as level as possible, pay attention to the data slowly move away from the measurement of the workpiece, sliding away from the measurement of the workpiece before the maximum data is the value of the entity space, usually difficult to measure as well as the measurement of the largest error in the measurement of the error in the small bottom of the choice of the region more and can not be clamped with the face of the measuring instrument with the face of the formation of a fixed key to cause as well as the R-angle and the slanting surface too large an angle can not be clamped to the measurement of the accuracy of the target, stability can only be near. Slope too large an angle can not be clamped.
Error message labeling problem: can be labeled to indicate the approximate equivalent of the symbol or the approximate equivalent of the symbol to tell the message; such as: ? or ≒ to meet the possible acceptable to reduce the contradiction.
5 take 3 rounding for the average: the highest and lowest rounding the accuracy of measurement (class refers to the ca accuracy and cp accuracy rounding and can reduce the average value of the human error of the average value of the stability of the data.
MSA: the actual capture of data acquisition can be combined with statistical engineering formulas and the actual measurement of the workpiece to produce SIP, CPK, GR&R in such as gauges: (1) Repeatability (2) Reproducibility (3) Bias (4) Linearity (5) Stability and other studies to determine the measurement instrument and the actual exercise of the actual workpiece to be measured is this one thing.