How to detect the effective height of threads with external thread height gages?
Publish Time: 2025-03-25
External thread height gages are precision measuring tools used to detect the effective height of threads. The effective height of a thread usually refers to the vertical distance between the top and bottom of the thread. This parameter is crucial to the meshing effect, load-bearing capacity and tightening effect of the thread.1. PreparationSelect appropriate external thread height gages: Select the corresponding model of external thread height gages according to the specifications of the thread to be measured (such as nominal diameter, pitch, tooth angle, etc.). Ensure that the accuracy of the external thread height gages meets the measurement requirements and has been professionally calibrated, and the calibration certificate is valid.Clean threads and external thread height gages: Use a dust-free cloth or a special cleaning tool to remove dirt, dust, grease and other impurities on the thread surface. Clean the measuring surface and contact points of the external thread height gages to ensure that they are clean and undamaged.2. Measurement stepsPreliminary inspection: Use visual inspection methods to make a preliminary observation of the thread to identify any obvious defects that may affect the measurement results, such as cracks, wear, deformation, etc.Install and position the external thread height gages: Properly install the external thread height gages on the measuring equipment, such as a micrometer or a dedicated thread measuring instrument. Contact the measuring surface of the external thread height gages with the crest and root of the thread being measured, ensuring that the measuring surface is perpendicular to the thread axis.Make measurements: According to the instructions for use of the external thread height gages, adjust the measuring equipment so that it can accurately read the effective height of the thread. Record the measurement data, including the date and time of the measurement, the model and calibration status of the measuring tool, the name of the measurement personnel, and the detailed data of each measurement item.3. Data analysis and judgmentCompare the measurement data: Compare the obtained measurement data with the standard size of the thread to analyze whether there is any deviation. If the effective height of the thread is within the specified tolerance range, the thread is considered to meet the requirements.Record and analysis: Record all measurement data and conduct detailed analysis. If the deviation is found to be beyond the tolerance range, further analysis of the cause is required, which may be errors in the manufacturing process, inaccurate measuring tools, or improper operation.Take corrective measures: Take appropriate corrective measures based on the analysis results to ensure the quality of the thread. If the thread does not meet the requirements, it may be necessary to reprocess or replace the threaded parts.4. PrecautionsMeasurement environment: During the measurement process, attention should be paid to the influence of environmental factors such as temperature and humidity on the measurement results. Before measurement, the measuring tool should be properly preheated to eliminate the influence of temperature difference on the measurement results.Operation specification: During the measurement process, ensure that the correct operating steps are followed to avoid human errors. When using external thread height gages, the thread surface should be gently touched to avoid excessive force causing measurement errors or damage to the external thread height gages.In summary, the external thread height gages provide strong support for the quality control of threads by accurately measuring the effective height of the threads. During use, the operating procedures should be strictly followed to ensure the accuracy and reliability of the measurement results.
