What are the three coordinate measurement methods? What three coordinate measuring machines are there?

Generally speaking, the measurement functions of a three-dimensional coordinate measuring instrument should include dimensional accuracy, positioning accuracy, geometric accuracy, and contour accuracy.

Three-coordinate measurement is a measuring equipment that measures the spatial coordinates of various points and elements of various parts and assemblies through the three axes of XYZ to evaluate length, diameter, shape error, and position error. It is equipped with high-precision guide rails, probes and control systems, and uses computer programs to automatically control the inspection process and calculate and output measurement results.

3 Common CMMs

1. The three-dimensional coordinate measuring machine is one of the effective methods to measure and obtain dimensional data, because it can replace a variety of surface measurement tools and expensive combination gauges, and reduce the time required for complex measurement tasks from hours to minutes. This is Effects that other instruments cannot achieve. The Mars series mobile bridge-type three-dimensional coordinate measuring machine evaluates the geometric shape of objects by collecting the three-dimensional coordinates of points in three-dimensional space. It is an automated coordinate measuring instrument that integrates light, electricity, gas, machinery and computer technology.

Mars Series Mobile Bridge CMM

2. The fully automatic image measuring instrument has a magnifying effect and can be used for inspection of length, angle, shape, surface, etc. It is a non-contact, two-dimensional measurement, especially suitable for the measurement of elastic and brittle materials. A probe sensor configuration can be added, which is equivalent to a small three-coordinate measuring instrument, that is, a compound image measuring instrument. Where the height needs to be measured, a probe is used to take elements (points or surfaces), and then in the software Calculate height.

CH series fully automatic image measuring instrument

The laser tracker is a three-dimensional optical coordinate measuring instrument that uses laser interference, a rangefinder and two mutually perpendicular angular encoders. In layman's terms, it uses the principles of light reflection, light interference and photoelectric signal conversion to achieve measurement. It uses laser to track the target mirror and determines the coordinates of the spatial point through its own angle measurement system and laser ranging system to achieve a complete measurement process. Its measurement accuracy can reach up to 10um and can detect each component. Travel accuracy, such as machine tool guide rail straightness, turntable axial direction, mutual perpendicularity, radial runout, etc. During the actual processing process, a laser tracker can be used to measure the dimensions of the parts to be processed as a basis for the machine tool processing feed. At this time, the laser tracker is transformed from a detection equipment into a process equipment and is used for manufacturing machine tool processing.

GTS laser tracker

In addition to the traditional three-point coordinate construction, point-line-surface coordinate construction, multi-point fitting coordinate system, etc., the GTS laser tracker also provides a complex fitting coordinate construction method, which allows the use of coordinates on the workpiece. Any curved surface, plane, positioning holes, and positioning points are combined as the basis for establishing coordinates, and the workpiece coordinate system is calculated by fitting.