With the continuous advancement of rock drilling tool technology, the use of high-power rock drilling rigs and large-size threaded drilling tools are becoming popular. In the processing of threaded drilling tools, thread processing is a big problem. Since there are many manufacturers of rock drilling tools, the processing equipment, processing methods, and processing levels of each manufacturer are different, and the shape and size of their processed threads cannot be the same. The thread interchangeability is necessary to ensure the connection fit of each product on the thread. To ensure the threads’ interchangeability, it is necessary to ensure that the machined threads meet general standards.

To ensure that the processed thread is qualified, it is first necessary to check whether the thread diameter of the product is up to standard, then check whether the physical size of the thread shape is up to standard. Of course, the testing process is inseparable from the tools, so what are the tools for thread testing?

Thread Diameter Inspection Tools

Common thread diameter inspection tools are vernier calipers, inside and outside diameter micrometers, etc. However, because these gauges are troublesome and require a high level of operation in the actual inspection, they are generally not used. Consider testing the thread diameter means checking whether the thread diameter size is up to standard, so it can be tested by checking its maximum and minimum limit size with a smooth gauge.

Thread Entity Dimension Inspection Tools

To accurately detect the physical size of the thread shape, it should be measured on a tool microscope. However, this kind of detection is very cumbersome and cannot be tested in batches, so it is generally not used. In actual testing, we use a comprehensive measurement method, that is, according to the principle of thread fit, design a thread that meets its screw-in requirements and limit gauges of several sizes that meet the requirements of thread testing.

The main connection structures of threaded connection drilling tools are wave, trapezoidal and compound threaded connections. Among them, the application of wave thread is the most common. The following are the detection tools of wave thread collected through the network.

Wave Thread Inspection Tools

There are three methods of testing waveform threads:

1. Directly using products (shank adapters and coupling sleeves) as testing tools for inter-matching inspection.

2. Using a tool microscope or profiler for inspection.

3. Using special waveform thread gauges.

If the product is used as the inspection gauge, the accuracy of the inspection cannot be measured, its scale cannot be controlled, and it is difficult to guarantee product quality. If a tool microscope or a contour meter is used for inspection, the size of the threads can be directly obtained, the product inspection requires a sample, especially for the inspection of internal threads, which requires high precision, slow inspection speed, and high investment in inspection equipment. The use of special waveform thread gauges is the simplest and most feasible because it is a special gauge with a fixed value, which is not only simple in structure and easy to use but also highly efficient in the inspection.