NOTE: Factory certification can only be provided upon satisfactory of the calibration verification procedures by an authorized representative of the L.S. Starrett Co. Use of your system without proper verification and certification is not recommended.
5.3 CNC and Manual Control Modes CNC programmable settings include X-Y stage position, Z-height (for focus adjustment), zoom, and lighting. M3 CNC metrology software is factory configured for AV300 and AV350 systems. Please refer to the separate M3 CNC Software manual. Stage position can be set manually using the system’s joystick and trackball pendant. Please see page 12 of this manual. Focus can be set manually by rotating the center knob of the joystick. Zoom and Illumination can be set manually be via the system’s touch-screen. Note that image brightness can also be adjusted using the display controls of the all-in-one PC or touch-screen monitor. Not that changing display settings does not affect edge detection (but changing lighting does). 5.4 Operating Considerations 5.4.1 Lighting Considerations Once the image has been properly focused and magnification has been set, adjust light levels as necessary. Correct lighting is paramount to accurate measurement with any video-based measurement system. A clear image with lighting toward the low side is recommended. Lighting that is too low will result in a dark, low-contrast image with indiscernible features. Lighting that is too bright will result in a washed-out image that distorts features. When adjusting lighting, start with light that is lower than desired, and then increase lighting while viewing the image on the monitor. Maintain constant lighting for consistent results. Use the same light level while sampling points for a single feature. Do not to change the light level between points used to measure a circle. Depending on the part characteristics and the feature being measured, the right combination of lighting from the available sources may aid in bringing out a particular feature. Take time to experiment by balancing these light sources.
NOTE: In order to preserve lamp life and to reduce unnecessary heat in the system, keep the lights turned down when the system is not in use.
5.4.2 Magnification Considerations Magnification (or zoom) is also important for proper measurements. In general, higher magnifi- cation provides greater resolution and accuracy; however, not all features should be inspected at the highest available magnification. Too high a magnification may make it difficult to discern the edge of a feature by exaggerating edge defects such as burrs or chips. Try decreasing the magnification until the edge is more clearly identifiable. Consider factors such as tolerance requirements, manufacturing processes, functional require- ments and optical characteristics of the part. Features with loose tolerances may not need to be inspected at high magnification. Select the highest magnification that is suitable for the feature being inspected.
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