Wired Water Meters,Water Sub Meter,Water Measurement Meter,Home Water Meter Ningbo Safewell Plumbing Co., Ltd. , https://www.safewellbrass.com The tooth direction error ΔF_β is an important error index for evaluating the uniformity of the load distribution of the gear in the transmission. It refers to the distance between the two design tooth lines of the actual tooth line in the range of the full tooth width of the indexing cylinder. End distance. Measure the helical gear tooth error, which can be measured by the tooth direction meter, the lead gauge or the spiral angle tester. The universal point gauge such as the universal tool microscope or the optical indexing head can also be used to make the spiral point.