When measuring b and c values, the measured limit error D has a great influence on the random error Dlim(da) of the tip circle diameter. It is best to measure directly with a micrometer and should be measured several times (measured across the same number of teeth). The average value is substituted into the formula (4). This reduces the effects of errors such as measurement errors and uneven tooth distribution.
When measuring the b or c value, it is not necessary to count how many teeth are crossed, but the difference between the number of teeth across the two is counted. M should be made larger, which can increase the K value and reduce the calculation error. To measure the measuring surface of the gage on the intersection of the tooth profile surface and the crest cylindrical surface, instead of being stuck on the tooth surface or the crest cylindrical surface, this can be achieved by adjusting the number of cross-measuring teeth. When calculating the K value, note that Z is the number of teeth on the entire circumference of the gear. In the measurement of sector gears, half gears and incomplete gears, the Z value should be calculated first, and then the K value should be calculated.
If there are burrs and flashes on the gear that affect the measurement, remove it first. The scope of adaptation of this method has proved that this method is effective in the measurement of the following gears. Measurement of the toroidal circle diameter of odd-tooth spur gears; measurement of the diameter of the semi-circular sector gears and incomplete gears; cylindrical gears, when some of the teeth are broken, the remaining gears are intact but insufficient In order to directly measure the diameter of the tip circle; the diameter of the tip circle is large, and there is no suitable large amount of time; it is inconvenient to remove the gear from the machine for measurement.
Conclusion By applying this method, it is convenient, timely and accurate to test and calculate the diameter of the tip circle of the spur gear, so that it is easy to draw the processing and manufacturing drawings to solve the production needs and improve the quality of equipment maintenance.
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