Coordinate measuring machines are quality control inspection tools used in industry to verify the dimensional measurements of a part or product. Inspections are typically the slowest parts of a manufacturing process. As the economy demands higher throughput and more efficient manufacturing, industry's focus has shifted to concentrate on improving the inspection process.
The HCMM is a parallel architecture machine with five actuated legs and a passive leg. Each actuated leg has a frameless, brushless DC motor, an encoder, over-travel and home sensors, and a brake. Additionally, the hollow legs of the HCMM provide a pathway for a laser interferometry system. This laser system determines the length of each leg to sub-micron accuracy.
A PMAC2 motion controller controls all of the motion, safety, and human-machine interface functions on the HCMM. Because of the HCMM's configuration, in order to do Cartesian Coordinate moves, inverse kinematics must be performed. Since the movement of each leg on a HCMM both translates and rotates the probe tip, it takes the simultaneous coordinated movement of all actuators to produce a pure translation or pure rotation motion. The HCMM software performs these calculations so that this process is transparent to the user and part programmer.
This HCMM is part of the Machine Tool Research Center at the University of Florida. Perry Automation was involved in all aspects of the controller design and installation.