CAD Auto Pass/Fail™ – Automatic Pass/Fail Results VisionGauge® Digital Optical Comparators

The CAD Auto Pass/Fail™ tool can be either point-based or it can consider complete geometric entities. In point-based mode, the part’s deviation from nominal is evaluated at precise user-specified cross-sections to verify that the part is within tolerance at all of these locations. And the geometry-based CAD Auto Pass/Fail™ tool verifies that the part is within tolerance over complete geometric entities. Note that the control-section-based and geometry-based CAD Auto Pass/Fail™ tools can be used simultaneously on the same part!

With the VisionGauge® Digital Optical Comparator you can specify bi-directional tolerances at various control sections. The system then automatically computes and displays, in real time, the part’s deviation from nominal at every control section and automatically displays a pass / fail result at every control section as well as for the overall part.

The geometry-based CAD Auto Pass/Fail™ tool is especially well suited to parts with “peaks and valleys” where we don’t know beforehand where the min & max deviations might be located…

Also, note that there are no restrictions on the tolerance values. So tolerances can be either the standard “plus/minus” tolerances, as well as “minus/minus” or “plus/plus” tolerances.

Many VisionGauge® Digital Optical Comparator users combine the CAD Auto-Align™ and CAD Auto Pass/Fail™ tools to fully automate their inspections:

• The operator loads the part in the fixture and scans the barcode on the traveller.
• This causes the VisionGauge® Digital Optical Comparator to load and run a part-specific program that automatically:
  • Reads-in the correct CAD file
  • Auto-Aligns the CAD file to the part
  • Produces an Auto Pass/Fail result that is collected in a Data Group and sent to Excel or an other external application…
  • In the case of parts that are larger than the system’s optical field-of-view, the stage moves the part and carries out the Auto Pass/Fail inspection at however many different locations are required. This way, the whole part gets inspected without having to “shift the overlay”. The CAD data tracks the part’s movement!