What is a Caliper Measuring Tool?
A caliper is a length measuring tool, mainly used to measure the length, inner and outer diameter, depth, and other parameters of a machined part. It is measured by the distance between the lines on the main ruler and is the main variety of length measuring tools. In order to improve the accuracy of measurement, the material of the caliper requires small thermal deformation and wear resistance.
Following, YIJIN Hardware will introduce you to the types and uses of calipers.
The general caliper will be used in conjunction with the data acquisition instrument. The data acquisition instrument can be directly connected to the caliper for automatic data acquisition, which can improve the accuracy of measurement and improve the efficiency of detection.
What Material is Different Types of Calipers Made of?
No matter what types of calipers, the material requirements are the same. As a measuring tool, the material of the caliper requires small thermal deformation and wear resistance. Combining these characteristics, the materials for making the different types of calipers mainly include:
Standard calipers are generally made of carbon steel, tool steel, and stainless steel. It should be noted that when carbon steel or tool steel is used, the hardness of the main measuring surface is not less than 58HRC; When stainless steel is used, the hardness of the main measuring surface is not less than 52.5HRC, and Cr13 stainless steel with higher carbon content is generally used.
Non-Standard Calipers are mainly used in fields with high accuracy requirements. In fields where measurement accuracy requirements are not too high, some calipers with lower accuracy can be used. The material requirements of this kind of caliper are not so high. Generally, ordinary materials can be used, such as zinc alloy, and stainless steel. However, the carbon content of this stainless steel material will be lower.
Special Calipers are for some Wenwan jewelry fields use carbon fiber calipers, because compared with metal calipers, this caliper has no hard texture and sharp edges, and it is not easy to scratch objects when measuring, so it is mostly used to measure valuable objects, like Wenwan, jewelry, etc.
The Main Types of Calipers and Its uses
There are mainly three common types of Calipers, vernier calipers, dial calipers, and electronic digital calipers.
Dial Caliper: Taking the pitch of the precision rack and gear as the known length, and using the indicator table with corresponding graduations as the hand-held length measuring tool for magnifying, subdividing, and indicating parts. The caliper with a gauge can solve the problem of the reading error of the vernier caliper. Common minimum reading values are 0.01mm and 0.02mm. Dial calipers for regular size measurements.
Vernier Calipers: The vernier caliper is composed of two parts: the main scale and the vernier attached to the main scale that can slide. Vernier calipers are mainly used to measure inner diameter, outer diameter, steps, depths, etc. When measuring a part with a vernier caliper, the integer part is read from the main ruler, and the fractional part is read from the vernier ruler. The principle of the vernier is to use the difference between the line spacing on the main ruler (referred to as line spacing) and the line spacing on the vernier ruler to read out the fractional part. There are three minimum reading values of 0.02mm, 0.05mm, and 0.01mm. Vernier calipers for the roughing measurements.
Electronic Digital Calipers: Using a capacitive grid, magnetic grid, and other measurement systems, the digital display of the measurement indicated the value of the length measuring tool. Electronic digital calipers are used for small tolerance (high precision) dimensional measurement.
In addition, there are various non-standard special calipers, such as hook depth calipers for measuring groove depth, tooth thickness calipers for measuring gear thickness, height calipers for measuring object height, and weld calipers (weld gauges) for measuring welding quality, etc.
Calipers for special purposes:
Claw’s type calipers, for irregular and unknown dimension measurement.
Offset calipers are used for measuring the position size of unequal height areas.
Depth calipers for depth measurement.
Thin-sheet calipers for narrow groove diameter measurements.
The Advantages and Industry Applications of Calipers
General calipers can be used together with data acquisition instruments. Data acquisition instruments can be directly connected to calipers for automatic data acquisition without manual data recording by operators, saving labor costs. Many calipers are connected to the QSmart data acquisition instrument for automatic data acquisition and data analysis.
Application Background: The current method of internal quality inspection in the factory is that after measuring data, the measuring personnel manually record it on paper, or one person measures and another person records the operation method. When the analysis is required, the operator enters the computer data. in the EXCEL table;
The problems caused by this method are low efficiency, and the data is easy to remember wrongly. At the same time, some operators are not aware of the measurement specifications of the product. When the product exceeds the specifications, the operator cannot take measures in time, and when data analysis is required, it needs to be re-entered into the computer.
Main Purpose: Connected calipers for efficient mobile data acquisition; Realize the paperless measurement, improve the accuracy of measurement and improve the efficiency of detection, and can remind in time when the specification is exceeded.
Selection of Measuring Tools
Before measuring, it is necessary to select different measuring tools according to the characteristics of the measured parts; The diameter of the shaft can be selected from micrometers and calipers; For holes and grooves, plug gauges, block gauges, and feeler gauges can be selected; Measuring parts of the straight Angle selection of try square;
Measuring R-value using R gauge; When the measuring tolerance is small and the precision is high or the shape and position tolerance is required, cubic and quadratic elements can be selected. A hardness tester is used to measure steel hardness.