CMMs are the backbone of any quality assurance facility and are the go-to reference when parts need to be accurately measured in 3D.
Coordinate measuring machines or CMMs use a touch probe (or a laser scanner) to measure features on parts in three dimensions.
CMMs can be either manual or automatic (direct computer-controlled – DCC), although most CMMs sold are DCC types.
There are three main types of CMMs – bridge, gantry and portable arm; all used to cover different applications and requirements, with bridge-type CMMs being the most common type.
Highly accurate and repeatable
Can report all GD&T functions
Very reliable and stable
CMMs also require CMM software to operate the controller and to measure features on parts.
Motorized indexing heads and touch-trigger probing systems are commonly used and specified, and jigs and fixtures to hold parts stable are also required.