What is the accuracy of CMM related to?

The accuracy of CMM measurements is related to various of factors.

First, environmental factors have a significant impact on the accuracy of CMM measurements. These factors include:

Temperature:

The stability of environmental temperature has great effective on the accuracy of CMM measurement. Different machine have different temperature requirement,so keeping the temperature stable is an important element to make sure the measurement accuracy.

Humidity Level:

Too much or too little humidity can affect measurement accuracy. High humidity may cause water vapor to condense on the measuring machine, while low humidity may cause static charges to grow and attract dust particles, especially when probing insulated objects and making optical measurements.

Compressed Air:

For proper operation of the air bearings and air spring isolators, the pressure of the compressed air must be within the specified range. The pressure is too high or too low, it can affect the performance of the measuring machine, while water, oil and dust particles in the air can damage these components and therefore require regular maintenance and filtration.

In addition, the mechanical parts of the CMM require special attention to maintenance, such as the guide ways, which need to be wiped regularly to prevent adhesion from affecting accuracy. The calibration accuracy of the probe and the correctness of the measurement method are also important factors to ensure the accuracy of the measurement.

Accuracy standards for CMM typically include dimensional accuracy, positional accuracy, shape accuracy, repeatability and resolving power. Compliance with these standards directly affects the precision and accuracy of workpieces during machining, manufacturing and assembly.

To ensure the accuracy of CMM, we still need to focus on the following key points:

Probe Accuracy:

High-accuracy probes are usually made from high-hardness, high-stability materials such as ruby or sapphire and require regular calibration.

Mechanical Structure Accuracy:

The mechanical structure is the skeleton of the CMM, and its accuracy directly affects the movement trajectory, which needs to be ensured by high-precision machining equipment and process, and regular maintenance.

Control System Accuracy:

The control system as the brain of the CMM, its accuracy affects the accuracy and stability of the movement, modern equipment using high-precision grating or encoder and high-performance software to realize high-precision position control.

Drive System Precision:

The drive system is the power source of the CMM, and its precision affects the smoothness and accuracy of the movement, usually using high-precision servo motors and drives.

Data Processing System Accuracy:

The data processing system directly affects the credibility of the measurement results and requires high-performance software and hardware support.

The technical level of the personnel using the CMM is also one of the factors affecting its measurement accuracy. The technical level and experience of personnel is extremely important to the use of CMM, because only personnel with a certain technical level can accurately operate and maintain this high-precision measuring equipment.

In summary, the accuracy of CMM is not only affected by environmental factors, mechanical parts, control system, drive system, but also by the data processing system, so it is necessary to comprehensively consider these factors to ensure the accuracy and reliability of the measurement.