After machining, the workpiece should be tested accordingly. Testing tools generally include: 1 Tooth gauge, 2 Needle gauge, 3 Vernier caliper, 4 Micrometer, 5 altimeter.
1. Tooth gauge
The tooth gauge is used to experience the quality of the thread. It is made according to national standards. There are external thread and internal thread. The external thread is understood as a screw to test the standard of the nut, and the internal thread can be interpreted as the standard of the nut to test the screw.
2. Needle gauge
Needle gauge is a standard used to inspect the inner hole. Generally, there are two, one is a through gauge, and the other is a stop gauge. Just like a metal bar, the through gauge must be able to be put into the hole, and the stop gauge must not be able to enter. If either of them is wrong, it means that the product size is unqualified.
3. Vernier caliper
Vernier caliper is a testing tool for measuring length, inner and outer diameter and depth. The vernier caliper is composed of a main ruler and a vernier attached to the main ruler and capable of sliding. The main ruler is generally in mm, while the vernier has 10, 20 or 50 divisions. According to the different divisions, the vernier caliper can be divided into ten division vernier caliper, twenty division vernier caliper, fifty division vernier caliper, etc. the vernier with 10 division has 9mm, 20 Division has 19mm, and 50 Division has 49mm. There are two pairs of movable measuring claws on the main ruler and the vernier of the vernier caliper, namely, the internal measuring claw and the external measuring claw. The internal measuring claw is usually used to measure the inner diameter, and the external measuring claw is usually used to measure the length and outer diameter.
4. Micrometer
Micrometer and vernier caliper are used to inspect external inspection, inner diameter and depth, but they are relatively simple. Different micrometers must be purchased for each specification, such as outer micrometer and inner micrometer. Micrometer is more accurate than vernier caliper, which can be accurate to 0.01 mm.
5. Altimeter
The altimeter is used to measure the depth dimension of products, such as the dimension from one end face to another. The dimension measured by the altimeter is more accurate than the vernier caliper, which can be accurate to 0.001mm.
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