CNC machine tools are designed to perform to certain standards of accuracy. You can assess CNC machine accuracy in two different ways; dynamic and static modes.
The Dynamic Mode
This refers to the accuracy of the axis as they are moving when the machine is functioning. There are two things that may cause dynamic accuracy errors: vibration and a Servo system positioning error. One of the main factors defining a machine’s performance is the machining speed. Typically, a high speed machine will be able to execute a program at around 20000mm/min. Because this feed rate is high, it’s possible that it could lead to a high lag value on the Servo System and also high vibration o the corners due to rapid acceleration and deceleration. The spindle and cutting force on the tip of the tool can also cause high levels of vibration that can lead to overall accuracy errors.
The Static Mode
This refers to the movement of the machine’s axes to a certain location where their position can be measured externally (you can use an interferometer laser for this) against the standardized values in the CNC. During this procedure, once the axes are at rest, you can use the laser to measure their position. Whatever the difference between this measurement and the command position, (CNC Register), is referred to as static accuracy. Mechanical alignment or volumetric, cross, or linear compensation can improve this accuracy.
At CAMaster, we use machinery, hardware and software to improve your company’s productivity and efficiency. Our team has a vast knowledge base and we are committed to sharing our experience with you to help you take your enterprise to the next level. Call us today to talk to find out more about comparing accuracy between CNC machines.