![]() ![]() So, given all the hype about CMMs, how do you know if you need one? As with most things, the truth lies somewhere in the middle. ![]() Others will suggest that while it has its uses, much of what a CMM does can be done by a skilled layout tech on a surface plate. Devotees swear by CMMs as the be all and end all of measurement tech. But they can also be finicky and demanding, requiring their own air conditioned rooms and highly trained programmers to achieve those results. Then it tells you if your part is good or bad.ĬMMs are capable of measuring complex parts with speed, precision, and repeatability. The attached computer creates a 3-D map of every point it locates and plots those points against an internal CAD model of where those points should be versus where those points are. Each beep represents a point noted on the part sample. And then it beeps again, sounding eerily like the TV-show version of a hospital operating room. ![]() It looks like an oversized granite table with a robot arm mounted to a bridge or a gantry that quietly floats around, touching the tip of a slender touch probe to the sample sitting in the middle. sits the Maharajah of measurement, the Pasha of precision: the Coordinate Measuring Machine (CMM), the ultimate device for accurate and repeatable measurements.Ī CMM is a computerized, programmable machine used to measure the size of a sample in three dimensions. High atop the pyramid of gages we mentioned in our post about gage selection… above the pins and blocks and calipers, above the micrometers and the air gages. ![]()
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