The use of portable articulated-arm coordinate measuring machines (CMMs) is growing in tube and pipe fabrication shops throughout the world. Mainly used for automotive and aerospace applications, CMMs nevertheless are useful for any fabrication that requires detailed inspection.Compared to their modern counterparts, early CMMs were large and cumbersome. Although they were adequate for performing fairly accurate tube measurements, early models were bench-mounted, the measuring arms were heavy, and the technology was limited to five axes.
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