In the manufacturing industry, CNC (Computer Numerical Control) turning is a pivotal process for creating precision parts. After the CNC turning process, post-process inspection is crucial to ensure that the produced parts meet the required specifications and quality standards. As a reputable CNC turning machine supplier, we understand the significance of accurate post-process inspection and the various measuring instruments involved. This blog will delve into the measuring instruments commonly used for post-process inspection of CNC-turned parts, highlighting their functions and importance.
Caliper
One of the most fundamental and widely used measuring instruments in post-process inspection is the caliper. Caliper comes in both vernier and digital types. Vernier calipers have been a staple in the manufacturing industry for a long time. They allow for accurate measurement of external dimensions, internal dimensions, and depths of the CNC-turned parts. The digital calipers, on the other hand, provide a more precise and easier-to-read measurement. They can display the measurement in both metric and imperial units, which is very convenient for international manufacturing requirements. For example, when inspecting a shaft produced by our Slant Bed CNC, a caliper can quickly and accurately measure its diameter to ensure it is within the specified tolerance range.
Micrometer
Micrometers are another essential tool for post-process inspection. They offer a higher level of precision compared to calipers. There are different types of micrometers, such as outside micrometers, inside micrometers, and depth micrometers. Outside micrometers are used to measure the external dimensions of parts with high accuracy, typically up to 0.001 mm or even more precise. Inside micrometers are designed for measuring internal diameters, while depth micrometers can measure the depth of holes or recesses. When inspecting parts produced by our Turn Mill Center Machine, which often require high precision, micrometers play a vital role in ensuring the dimensional accuracy of the parts.
Surface Roughness Tester
Surface roughness is an important parameter for many CNC-turned parts, especially those that will be in contact with other components or need to have a specific aesthetic appearance. A surface roughness tester is used to measure the surface texture of the parts. It can provide information about the roughness average (Ra), maximum peak-to-valley height (Rz), and other surface roughness parameters. By using a surface roughness tester, we can ensure that the surface finish of the parts meets the design requirements. For instance, parts produced by our Horizontal Slant Bed Lathe may need to have a certain surface roughness to ensure proper functionality or to meet the customer's aesthetic expectations.
Coordinate Measuring Machine (CMM)
A Coordinate Measuring Machine (CMM) is a highly advanced and accurate measuring instrument. It can measure the geometric features of a part in three-dimensional space, such as the position, orientation, and shape of holes, slots, and other features. CMMs use a probe to touch the surface of the part at various points and then calculate the coordinates of these points. This allows for a comprehensive inspection of the part's geometry. CMMs are especially useful for complex parts with tight tolerances. They can quickly and accurately detect any deviations from the design specifications, ensuring the quality of the parts produced by our CNC turning machines.
Optical Measuring System
Optical measuring systems, such as vision measuring machines and laser scanners, are becoming increasingly popular in post-process inspection. Vision measuring machines use cameras to capture images of the parts and then analyze the images to measure the dimensions and features of the parts. They are non-contact measuring methods, which means they can measure delicate or soft parts without causing any damage. Laser scanners, on the other hand, use laser light to scan the surface of the parts and create a three-dimensional model. This model can be used to analyze the shape, dimensions, and surface quality of the parts. Optical measuring systems are very efficient and can provide high-resolution measurement results, making them suitable for high-volume production and quality control.
Gauge Blocks
Gauge blocks are precision reference standards used for calibrating other measuring instruments. They are made of high-quality materials with extremely accurate dimensions. By comparing the measuring instrument with gauge blocks, we can ensure its accuracy and reliability. Gauge blocks are an important part of the quality control process in post-process inspection. They help to maintain the consistency and accuracy of the measurement results, which is crucial for ensuring the quality of the CNC-turned parts.
Hardness Tester
Hardness is an important mechanical property of many CNC-turned parts. A hardness tester is used to measure the hardness of the parts. There are different types of hardness testing methods, such as Brinell hardness testing, Rockwell hardness testing, and Vickers hardness testing. Each method has its own advantages and is suitable for different types of materials and parts. By measuring the hardness of the parts, we can ensure that they have the required strength and durability. This is especially important for parts that will be subjected to high loads or wear and tear.
Thread Gauge
For parts with threaded features, thread gauges are used to inspect the thread quality. There are two main types of thread gauges: plug gauges and ring gauges. Plug gauges are used to check the internal threads, while ring gauges are used to check the external threads. Thread gauges can quickly and accurately determine whether the threads meet the specified pitch, diameter, and thread form requirements. This is crucial for ensuring the proper fit and functionality of the threaded parts.
In conclusion, post-process inspection of CNC-turned parts is a critical step in the manufacturing process. By using a variety of measuring instruments, we can ensure that the parts meet the required specifications and quality standards. As a leading CNC turning machine supplier, we are committed to providing our customers with high-quality machines and also offering them the knowledge and support they need for post-process inspection. If you are interested in our CNC turning machines or have any questions about post-process inspection, please feel free to contact us for procurement and further discussions.
References
- ASME Y14.5 - 2018, Dimensioning and Tolerancing
- ISO 1101 - 2017, Geometrical product specifications (GPS) - Geometric tolerancing - Tolerances of form, orientation, location and run - out
- Machinery's Handbook, 31st Edition
