Light-gap process

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The light penetrating between the corner of the hair and the support is clearly visible

The light gap method is the name of a test method that is often used when testing the shape of workpieces using gauges .

To check the shape, a gauge with the negative nominal shape is held against the workpiece and both are viewed against a light source. The workpiece is deemed to be good if there is no gap between the gauge and the workpiece through which light can penetrate. With good lighting, deviations from 0.002 millimeters can be seen. If the workpiece does not yet have the desired shape, it can often be seen from the support points where material has to be removed.

The simplest example is checking a flat surface using a straightedge . Another example of testing using the light gap method are radius gauges.

See also

  • General: Testing as a comparison of an actual with a target state see: Testing
  • Check for compliance with specified requirements ( specifications ) see: Quality check