Measurement

A Look-Ahead item on a green laser-line metrology scanner.

Introduced in 1959, coordinate measuring machines have become increasingly common over the last 2 decades. The complexity and cost once meant CMMs were only suitable for large manufacturers. Advances in CMM technology and manufacturing techniques have reduced the cost of ownership, and the machines are now found at all types and sizes of shops.

Stopping a machine to measure a workpiece is a waste of time. Not only is a high-priced piece of CNC equipment being taken out of production, but the measurements obtained when a machinist leans into a machine with a micrometer or bore gage can't compare in accuracy to those generated by a coordinate measuring machine or inline probe.

Multisensor measurement can make part inspection for machine shops more efficient.

An inline, noncontact measurement system for 100 percent inspection of vehicle wheels.

Thermal compensation of a coordinate measuring machine's principle structural components and the part being measured helps ensure measuring accuracy over an extended temperature range when the CMM is installed outside of a temperature-controlled area. Such a temperature-compensation system is comprised of temperature sensors and cabling running through the machine to its controller. The more sensors there are the more accurate the system, but these cables can cause mechanical issues and will eventually fray or break because of the constant CMM motion.