Helmel Engineering | Coordinate Measuring Machines (CMMs) | Custom CMM Machines Helmel, CMM, Coordinate Measuring Machines, CMM Retrofits, Coordinate Measuring Machine, Benchtop CMM, Geomet, Geomet CMM Software Welcome to Helmel Engineering. We have been designing and manufacturing Coordinate Measuring Machines since 1973 making us the oldest, continuous CMM company in the USA.