Optical CMM Gauge Capability Evaluation for Sub Millimeter Molded Features
Optical CMM capability on sub-millimeter molded features requires material-specific bias correction and telecentric backlighting to maintain GR&R under 20%.
Sub Millimeter Features
Meaning
Dimensional categories include any physical geometry on a component that measures less than one millimeter in any direction. Manufacturing sub millimeter features requires specialized tooling and high resolution inspection systems to ensure compliance with design specifications.
Miniature Geometry
Creation of small holes and thin walls demands precise control over the production environment and the material properties. When sub millimeter features are part of a design, the tolerances are often tighter than those for larger components. These parts are commonly found in electronics and medical implants where space is at a premium.
Successful Production
Achieving a high yield for tiny components depends on the ability of the machine to maintain its position within a few microns. For sub millimeter features, even a small thermal expansion of the machine frame can cause a part to fail inspection. Specialized micro machining or molding equipment is used to produce these parts at scale.
Inspection Scale
Verification of these tiny dimensions cannot be done with standard hand tools or low resolution cameras. Because sub millimeter features are so small, the inspection system must have a high magnification and a very narrow field of view. Automated vision systems are the primary tool for measuring these features in a production setting.