In the production process of gold treatment enterprises, whether metal products and raw materials are qualified or not depends on measuring tools to make a judgment. Whether the indicator value of the measuring tool is correct or not is directly related to the correctness of judging whether the metal product is qualified. We often use metal length gauges which can be divided into vernier gauges, divider gauges, meter gauges and Angle gauges. Vernier measuring tools include: vernier calipers, vernier height calipers, vernier depth calipers, digital calipers and calipers with meter; Sorting card measuring tools include: outside diameter micrometer, thread micrometer, etc. : meter type measuring tools include dial gauge, micrometer, inner diameter scale, etc.; Angle gauge commonly used with universal Angle ruler. Here we introduce several commonly used metal measuring tools:

1. Metal measuring tool - vernier caliper in order to improve the reading accuracy, the scale value on the ruler must be as small as possible, which requires the scale to be dense, the width of the line to be fine, so that not only in the process of manufacturing difficulties, but also in the use of naked eye observation is difficult. If a ruler with a larger scale is placed side to side, and there is a slight error between the lines using them, it can be seen at once. The vernier caliper uses this feature to add a graduated scale to the line master for reading, as shown in the figure:

The scale of the master ruler is 1mm per grid. The scale of the vernier is 0.98mm per grid. When in use, the ruler reads as an integer, and the cursor reads as a decimal (< 1mm), the sum of the two is the actual size.

2. Metal measuring tool - outside diameter micrometer

outside diameter micrometer is made of thread drive principle. When the thread is driven, the stroke in the axis direction is proportional to the rotation Angle of the thread. Thread distance is generally made of 0.5mm, differential cylinder circumference has 50 degrees, every rotation of a degree, the rod axial movement of 0.01mm. For micrometer reading, the measuring axis is inscribed as an integer (> 1mm), read the decimal on the differential cylinder, and the sum of the two is the actual size. The measured reading is shown in the figure, and the reading is 14.10mm.

3. Metal measuring tool - digital calipers

Digital caliper is a length measuring instrument with CAPACitor-gate (or light shed, etc.) measuring system and digital display for reading. Its shape is shown in the figure. It is mainly used to measure the outer and inner dimensions of the parts.

1. Measuring claw in a knife edge; 2 one foot frame; 3- Brake screw; 4 a display; 5 a data output port; 6 a foot body; 7 an external measuring claw; 8 one metric, inch conversion button; 9 a zero button; 10 A depth ruler

4. metal detection measuring tools - with meter calipers

As shown in the outline drawing of the caliper with meter. The distance separated by the relative movement of the two measuring claws of the caliper, indicating the integer part of the chamber meter value on the ruler, indicating the decimal part of the child meter value on the indicator table. Calipers with meter are mainly used to measure the outer and inner dimensions of parts.

1 one foot body; 2 an internal measuring claw; 3 a rack; 4 an indicator table; 5 a fastening screw; 6 a foot frame; 7 a depth ruler; 8 a roller handle; 9 a dial locking screw; 10 An external measuring claw