Horizontal Arm CMM: Picture a cantilever, but with the whole bridge moving up and down the single arm rather than on it’s own axis.These are typically the largest CMM’s, so they need the extra support. Gantry CMM: The gantry uses a guide rail on both sides, like a CNC Router.Cantilever CMM: The cantilever supports the bridge on only one side.
One side of the bridge rides on a rail on the bed, and the other is supported on an air cushion or other method on the bed without a guide rail. Bridge Type CMM: In this design, the most common, the CMM head rides on a bridge.There are five types of coordinate measuring machine: Computer control came along in the early 1970’s, and was introduced by Sheffield of USA. 3 axis machines were introduced in the 1960’s by DEA of Italy. The very first machines only had 2 axes of motion. They were needed for precision measurement of parts in the aerospace and defense industries. The first CMM Machines were developed by Ferranti Company of Scotland in the 1950’s. They may also be used to reverse engineer existing parts by making accurate measurements of their features. That is, they are used to verify the part meets the designer’s requirements and specifications. Typically CMM’s are used for inspection and quality control. And the more complex or numerous the measurements, the more advantageous it is to use a CMM. Applications of Coordinate Measuring MachinesĬoordinate Measuring Machines are valuable any time accurate measurements need to be made. They’re perhaps the ultimate 3D measuring devices in terms of their combination of overall flexibility, accuracy, and speed. Hexagon Global Classic CMM, a typical coordinate measurement machine…ĬMM stands for “Coordinate Measuring Machine”. Imagine a CNC-style machine capable of making extremely precise measurements in a highly automated way.
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