Current Help System: PC-DMIS Laser (View Core Help)

#### Flush and Gap Specific Parameters

For a visual example of these parameters, consult the diagrams below.

Flush: This box determines the height difference between two mating sheet metal parts. Whether or not the flush value is positive or negative depends on whether it’s higher or lower than the “Master” side.

Gap: This box determines the distance (in the same plane) between two mating sheet metal parts.

Indent: The indent specifies the distance from the gap’s edge at which PC-DMIS measures the flush.

Spacer: This is a circle at the indent point used to calculate the surface normals used in the calculation.

Bend Radius: This box determines the radius of the bent corner of the material making up the gap. As the curved walls of the gap approach the surface vector, becoming parallel with the laser beam's vector, the laser data becomes less reliable (or is not present altogether). This radius value compensates for this condition. The Flush and Gap algorithm uses a 60 degree gap gage as shown in the picture below. You should define a Bend Radius value to obtain an actual gap reading. You can set this value to 0 for gaps with sharp edges.

Gap Dir (Vector): These boxes in the Orientation area define the direction of the gap and, subsequently, the direction the laser probe takes to scan the Gap and Flush.

Flush and Gap Diagram | 1 - Gap 2 - Indent 3 - Flush (negative flush is shown at left) 4 - Master side 5 - Gap direction

6 - Spacer

The “Master” side is always to the left of the scan/gap direction.

Bend Radius Diagram | 1 - 60 degree gap gage 2 - Master side 3 - Flush 4 - Gap 5 - Bend radius at tangent point

The direction of the scan is controlled by the specified gap direction and not the direction of the laser stripe.

Direction of scan

The “Master” side is always to the left of the scan/gap direction.

Sample Flush and Gap in the Graphics Display window showing the Indent (red lines), Spacer (purple circles), and the Overscan (yellow lines)