What inspection tools are used for verifying tight tolerances?
What Inspection Tools Are Used for Verifying Tight Tolerances?
Overview: Importance of Precision Inspection
In CNC machining, verifying tight tolerances—especially those of ±0.01 mm or better—requires advanced metrology equipment capable of detecting minute dimensional deviations. At Neway, we apply both contact and non-contact inspection methods to ensure all parts meet exacting specifications across industries such as aerospace, medical, and robotics.
Common Inspection Tools for Tight Tolerances
Coordinate Measuring Machine (CMM)
Accuracy: ±0.002 mm or better
Measures complex 3D geometries using a probe in contact or scanning mode
Ideal for tight-tolerance parts with intricate profiles, such as turbine blades or surgical components
Digital Micrometers and Calipers
Accuracy: ±0.001 mm (micrometer), ±0.02 mm (caliper)
Used for quick, reliable measurement of outer diameters, thicknesses, and step features
Suitable for high-precision yet repeatable inspection during production
Dial Bore Gauges and Plug Gauges
Bore gauges provide internal diameter checks with micrometer-level precision
Plug gauges offer fast Go/No-Go checks for tight-fitting internal features
Common in parts like housings, valve bodies, and shaft guides
Height Gauges with Surface Plates
Used for vertical measurements and flatness verification
Often paired with granite surface plates for maximum stability during layout inspections
Optical Comparators (Profile Projectors)
Provide visual overlay of part profile against digital or physical templates
Useful for edge profiles, angles, and radii where visual deviation is critical
Laser and Vision-Based Systems
Non-contact, high-speed inspection for soft or small parts
Suitable for volume production and parts where contact could deform features
Surface Roughness Testers
While not for dimensional tolerances, they ensure specified surface finishes like Ra ≤ 0.8 µm are achieved
Essential for parts with sealing or friction-sensitive surfaces
Integrated Quality Assurance at Neway
Neway integrates inspection planning directly into the precision machining workflow. Our team utilizes calibrated equipment and follows international standards such as ISO 2768 and GD&T practices. We provide full inspection documentation for high-reliability sectors such as aerospace, medical devices, and nuclear components.
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