A coordinate measuring machine (CMM) is a device that measures the geometry of physical objects by sensing discrete points on the surface of the object with a probe. Various types of probes are used in CMMs, including mechanical, optical, laser, and white light. Depending on the machine, the probe position may be manually controlled by an operator or it may be computer controlled. CMMs typically specify a probe's position in terms of its displacement from a reference position in a three-dimensional Cartesian coordinate system (i.e., with XYZ axes). In addition to moving the probe along the X, Y, and Z axes, many machines also allow the probe angle to be controlled to allow measurement of surfaces that would otherwise be unreachable.
Stafford (/ˈstæfərd/) is the county town of Staffordshire, in the West Midlands region of England. It lies about 15 miles (24 km) north of Wolverhampton, 15 miles (24 km) south of Stoke-on-Trent and 24 miles (39 km) north-west of Birmingham. The town population in 2011 was 68,472 and that of the wider borough of Stafford was 122,000, making it the third largest in the county after Stoke-on-Trent and Newcastle-under-Lyme.