A measurement taken from the LR interface, when you press the Measure [F3] button, uses the parameters defined in the selected measurement target.
There are many targets and you can build your own. The interface offers 4 quick select buttons that can be programmed with your most commonly used operations. In addition, the selected Meas/Insp Location controls the corresponding target and measurement quick select options, so you can have 4 presets per operation.
To select a target for a particular quick select button, press the arrow button the right of the desired button. A list of targets will appear for selection categorized by type.
To access the parameters defined for the measure modes, double-left click on a quick select button and the Advanced Target Manager will appear. Here a user has both full access to all the measurement modes available, can tweak a particular profile to suit the measurement task at hand, and designate the quick access button associated with it.
Measurement Targets are defined using reference geometry which define where a measurement is to take place and the area to cover. Examples of measurement targets include:
Circles
Closed Perimeters
Open Perimeters
Point Groups
Vector Groups
The way in which targets are measured include methods such as:
Surface Point. Which is a direct surface measurement
Reflector. Which finds the center of a reflector.
Tooling Ball. Which is a spiral search to find the center of a reflective tooling ball.
Sphere Fit Target. Which is a scan of a non-reflective spherical target to which sphere fit is then performed.
HoleCircle. Which defines a number of passes across a circle’s edges and a coverage threshold.
Metrology Scan. This measurement process scans along a line segment (or sequence of line segments) much line a Vision Scan, but to do so it defines a set of measurement points along each segment. It then moves from point to point performing an SVI measurement at each location. It produces a scan of lower density but higher accuracy than a vision scan.
Vision Scan. This measurement scans along a line segment (or sequence of line segments). It is a continuous scan where the laser doesn’t stop during the scan progression, performing a much faster region scan than is performed by the metrology scan process but at lower resolution.
Edge Search. Which searches for an edge.
Surf-Vector Intersection (SVI). Which searches along a nominal vector to where it intersects with an actual surface.
There are two different quality thresholds that can be set for different targets. As an example the thresholds from a metrology scan are shown here:
ScanPowerThreshold. This establishes the a baseline power return (dB, see FFT window) necessary for data to be send to SA.
QualityThreshold. Is a standardized threshold to filter out poorly resolved points. It establishes a Pass / Fail criteria in a range from 0-100 and is used when processing a region, much like an RMS result. A similar quality setting is used for geometry fit results.
For additional details refer to the UserGuide_MV330-350_v1.5.pdf available from Nikon.
This section will briefly cover some basic single point measurement types. For further information please consult Nikon Metrology.
Select the desired tooling ball measurement mode for select- ed quick select. Use the drop-down arrow to pick the desired measurement mode. If the needed measurement does not exist, create a new one in the target manager .
Steer the laser to the tooling ball of choice. Point the laser to a surface near the tooling ball and press F8 to perform an auto-focus. Once complete aim the laser to the center of the tooling ball.
Press the Measure button or F3.
The point will be sent to SA, if not check the output box to check measurement failure details.
Select the desired surface point measurement mode for selected quick select. Use the drop down arrow to pick the de- sired measurement mode. If the needed measurement does not exist, create a new one in the target manager.
Steer the laser to the surface point of interest. Press F8 to perform an auto-focus.
Press the Measure button or F3.
This section will briefly cover some basic scanning measurement types. For further information please consult Nikon Metrology.
Box scanning allows the scanner to perform a scan bounded by a box with prescribe dimensions.
Point the laser at the center of the area of interest.
Select the appropriate scan mode. Double click the measurement mode to access scan parameters. Enter the scan box dimensions.
Press Measure or F3.
A scan will be performed inside the bounding box.
Perimeter scanning allows the scanning region of the LR to be con- strained by a 3D perimeter.
In SA, select Construct>Perimeter. Select the measured or nominal points which describe the bounding region to be scanned. Two types of perimeters exist in SA, open and closed. A single perimeter can be changed from open to closed in the perimeter properties dialog.
In the LR Interface, change the Meas/Inspec Location to Selected SA Geometry.
In SA, select the desired perimeter. Once selected, the quick
Double-click the measurement mode to access scan parameters.. Often times a user will change the output format, grid rotation and point spacing.
Press Measure or F3.