In the measurement of the outer diameter of an odd-toothed tool, if there is no three-channel micrometer or that it cannot be measured with a three-channel micrometer, the open-sleeve measurement method can be used. For ease of processing and measurement, the open sleeve can be machined into a full circle. According to the minimum limit size of the outer diameter of the tool, the actual value of the hole diameter and outer diameter of the sleeve to be tested is calculated, and then the sleeve is opened after the actual wall thickness is calculated. The open sleeve can cover the two teeth of the tool to be tested. If there are too many teeth, interference will occur. Measurement method: The opening sleeve is clamped on the outer circumference of the tool to be tested, and the two teeth are wrapped and measured by the outer diameter micrometer size M. In order to reduce the influence, the size of the outer diameter of the tool is required to be controlled at <30 0.018 0.012. Description: 1) Due to the small manufacturing tolerance of the reamer, the measurement with the outer diameter micrometer with a graduation value of 0.01 mm cannot guarantee the accuracy, and the lever micrometer is used in the production. The lever micrometer has a circular indication window with a value range of 0.04 mm and a division value of 0.001 mm. When using, first correct the nominal size with the proofing rod and measure the outer diameter of the tool. The tool passes when the reading value in the window is within the manufacturing tolerance of the tool outer diameter. 2) For taps with large outer diameter tolerances, they can be measured with a common outer diameter micrometer. Sample Preserving Solution,Virus Sample Collection Tube,Inactivated Viral Transport Tube,Inactivated Viral Transport Kit Guangzhou Baybio Bio-tech Co., Ltd , https://www.gzbaybio.com