Introduction:
You would find many tools in the industries. However, the basic ones are still the screws, nuts, and pipes. Each of these tools has threads on them. Some of the devices such as the screws and certain pipes have their threads on the outside whereas certain pipes and invariably all the nuts have their threads on the insides. These are essential tools in the sense that the failure of even a single screw or nut can bring an aeroplane to the ground within no time. Therefore, it becomes imperative that these screws and nuts, and so on pass stringent quality tests. One of the first tests they have to pass is the tolerance level. The industry workers use implements such as the trapezoidal thread gauges to determine the level of tolerance of the screws used in the aircraft doors.
The different kinds of threads:
You have seen above that there are different kinds of threads. You can find some, on the external portions of the implement whereas some would be inside them. Naturally, you cannot have a single implementation to check the tolerance level in all these different kinds of tools.
For the implements having their thread on the external side, you can use the thread ring gauges for determination of the tolerance factor. This particular implement goes by the name of the ‘Go and No Go’ thread ring gauge. The beauty of the device is that the screw or the pipe would go through one ring but would not go through the other. It would entail that the tolerance factor is perfect.
On the other hand, the implements that have the threads on the insides are certain pipes and nuts. You have to use the thread plug gauges for determining the tolerance factor. These implements would be a sort of a plug, one side of which would go inside the implement smoothly. The other side should not go through. If it does, then the tools fail to pass the test. They require improvement.
The pipes also have different kinds of threads as compared to the screws and the nuts. The call it the NPT thread in the industry circles. These particular kinds of threads require some additional treatment to prevent leakages. They apply a lubricating material or a tape while affixing them to prevent leakages.
Sometimes, the pipes carry inflammable liquids and gasses. Under such circumstances, one has to exercise more care. The lubricating material would not suffice. Therefore, they use other equipment such as Teflon for affixing the threads. It makes these implements leak proof.
The advantages of the thread gauges are as follows.
You would be able to check the tolerance levels of these implements. You would be able to determine whether these instruments are good or bad. The best part of all these activities is that you can perform this activity with ease. You do not require any particular kind of training to conduct these tests. Any engineering student would be able to manage the task with ease.
Final words:
You need to check the tolerance levels of all such industrial implements before putting them to use.
