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Application of CMM in CNC Machining Workshop
by：Yifeng Metal
2022-02-27
Application of CMM in CNC machining workshop
Coordinate Measuring Machine Applications
CMM is the most advanced modern automated and manual measurement method that has found many possible uses in the industry. Many different types of CMMs allow this tool to be used on both large (gantry CMM) and smallest (cantilever CMM) machines. Multiple probe types (mechanical, optical, laser or white light) allow you to measure even surfaces that the probe or any other object must not touch. The high degree of CMM automation allows it to be used either manually by machinists or to reduce labor by automating it for repetitive operations involving high volume production.
How to use the CMM machine depends on what you want to achieve. Its level of flexibility and precision offers manufacturers many opportunities. You can use the CMM to redesign existing parts after machining or measuring them, or you can use it as part of an automated manufacturing chain. There are many options here, some of which are listed in the following paragraphs.
What you must do before using CMM
CMMs use the most precise instruments to measure. They can estimate failures in parts smaller than microns. However, in order for them to achieve the desired accuracy, the mechanic must thoroughly prepare the equipment for taking measurements. The level of readiness depends on the accuracy of the part being tested. If we're talking about the highest precision parts (parts with a tolerance of IT6 or less), you will have to prepare the CMM and the area where you will be measuring. It has to have a specific percentage of humidity and optimum temperature, and it has to be very clean, because with this precision even tiny dust can affect the outcome of the operation.
The CMM itself is usually calibrated using extremely accurate metal balls. Its size and shape deviations are well known. The position of the sphere on the granite table is also known (usually with a special fixture in the center of the table). The probe must touch multiple points on the sphere and determine its diameter and shape deviation. Then adjust the measurements based on their deviation, and measure the spheres again to make sure the correct settings are saved.
CMM for complex surface measurement
The main purpose of a CMM is to measure complex surfaces. That's why CMMs can reach their full potential when they are used in turbine blades, aircraft wings, pump impellers and other components with special surfaces.
Automation of this type of job is also possible if you are making a lot of identical parts and they are so precise that you have to check every single part. However, in most cases, these parts are measured manually by mechanics.
To measure complex surfaces, the mechanic will use the remote control to manually move the probe along three axes until the probe touches the part the mechanic needs. Then, after taking a lot of measurements, analyze the points and connect the outline of the part as splines. The measurements are then compared to a 3D model of the part (including acceptable deviations) or some other data showing the desired dimensions.
CMM for Relational and Formal Deviations
CMM Measurement of Surface Finish
Profilometers are the most common surface finish measurement instruments. However, CMM machines can also measure the surface finish of parts because of their excellent accuracy. However, you must replace the probe with a special needle. The needle will then move along the surface and identify any type of microscopic irregularities that create the surface finish.
We operate a quality system certified to the ISO 9001:2015 standard. If you would like to obtain machined parts that are more accurate in size and shape, please feel free to contact us to discuss your part measurement requirements.
custom metal parts has become a standardized way of dealing with custom metal works.
Dongguan Yifeng Metal Co., Ltd. promises you that you will be satisfied with our service.
If our brand is successful and consistent, it will be much easier to initially grab customers and encourage them to purchase custom metal parts further.
Modern industry is characterized by the precision with which components are manufactured. It has been assessed as a tenth of a micron and continues to grow. In fact, the machine tool accuracy declared by the manufacturer has improved so much that it has become increasingly difficult to measure the actual deviation of manufactured parts. Therefore, new control methods and metering equipment are constantly being developed and improved. One of the flexible, fast and precise units of equipment for estimating part accuracy is the coordinate measuring machine.
Coordinate Measuring Machine Applications
CMM is the most advanced modern automated and manual measurement method that has found many possible uses in the industry. Many different types of CMMs allow this tool to be used on both large (gantry CMM) and smallest (cantilever CMM) machines. Multiple probe types (mechanical, optical, laser or white light) allow you to measure even surfaces that the probe or any other object must not touch. The high degree of CMM automation allows it to be used either manually by machinists or to reduce labor by automating it for repetitive operations involving high volume production.
How to use the CMM machine depends on what you want to achieve. Its level of flexibility and precision offers manufacturers many opportunities. You can use the CMM to redesign existing parts after machining or measuring them, or you can use it as part of an automated manufacturing chain. There are many options here, some of which are listed in the following paragraphs.
What you must do before using CMM
CMMs use the most precise instruments to measure. They can estimate failures in parts smaller than microns. However, in order for them to achieve the desired accuracy, the mechanic must thoroughly prepare the equipment for taking measurements. The level of readiness depends on the accuracy of the part being tested. If we're talking about the highest precision parts (parts with a tolerance of IT6 or less), you will have to prepare the CMM and the area where you will be measuring. It has to have a specific percentage of humidity and optimum temperature, and it has to be very clean, because with this precision even tiny dust can affect the outcome of the operation.
The CMM itself is usually calibrated using extremely accurate metal balls. Its size and shape deviations are well known. The position of the sphere on the granite table is also known (usually with a special fixture in the center of the table). The probe must touch multiple points on the sphere and determine its diameter and shape deviation. Then adjust the measurements based on their deviation, and measure the spheres again to make sure the correct settings are saved.
CMM for complex surface measurement
The main purpose of a CMM is to measure complex surfaces. That's why CMMs can reach their full potential when they are used in turbine blades, aircraft wings, pump impellers and other components with special surfaces.
Automation of this type of job is also possible if you are making a lot of identical parts and they are so precise that you have to check every single part. However, in most cases, these parts are measured manually by mechanics.
To measure complex surfaces, the mechanic will use the remote control to manually move the probe along three axes until the probe touches the part the mechanic needs. Then, after taking a lot of measurements, analyze the points and connect the outline of the part as splines. The measurements are then compared to a 3D model of the part (including acceptable deviations) or some other data showing the desired dimensions.
CMM for Relational and Formal Deviations
Most high-quality parts are characterized not only by their dimensional errors, but also by the accuracy of their surface shapes and their relative positions. These deviations are especially important for rotating parts to reduce vibration and ensure smooth motion. CMM measurements of such deviations are not much different from those of complex surfaces. All formal and relational deviations have a base to which they are compared. Therefore, in order to meet the accuracy requirements, you must clamp the part on the base and measure the desired part. If we are talking about the relationship between two surfaces, just design the fixture to clamp the first surface and measure the second surface.
CMM Measurement of Surface Finish
Profilometers are the most common surface finish measurement instruments. However, CMM machines can also measure the surface finish of parts because of their excellent accuracy. However, you must replace the probe with a special needle. The needle will then move along the surface and identify any type of microscopic irregularities that create the surface finish.
We operate a quality system certified to the ISO 9001:2015 standard. If you would like to obtain machined parts that are more accurate in size and shape, please feel free to contact us to discuss your part measurement requirements.
custom metal parts has become a standardized way of dealing with custom metal works.
Dongguan Yifeng Metal Co., Ltd. promises you that you will be satisfied with our service.
If our brand is successful and consistent, it will be much easier to initially grab customers and encourage them to purchase custom metal parts further.
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