Video Inspection Software User’s Guide
Skew Alignment When a part is misaligned (twisted) in the XY plane, small cosine errors can be generated during the measurement process. These errors can be eliminated by creating a skew alignment for the part. The skew alignment performs a precise measurement of the part of misalignment in the XY plane. Once the misalignment is known to the system, subsequent feature measurements are automatically compensated to eliminate cosine errors. Measurement data in the feature detail screen and DRO viewports will reflect measurements of a perfectly aligned part. To create a skew alignment: 1 Select the desired probe from the probe menu. Measure toolbar > Probe menu > Desired probe 2 Press the Skew button of the Datum menu. Measure toolbar > Datum menu > Skew button 3 Probe a minimum of two points well distributed along the entire length of the desired part reference edge. 4 Press the Done button to complete the measurement and enter the skew line into the Feature List. Measure toolbar > Done button Part Datum Creating the part datum point is the final step in establishing a valid reference frame for subsequent measurements. The part datum can be created by: • Probing a single point • Constructing a point from one or more parent features • Manually zeroing the X and Y coefficients of a feature Probing a Part Datum Point The part datum can be created directly by probing a point. To probe a part datum point: 1 Select the desired probe from the probe menu. Measure toolbar > Probe menu > Desired probe 2 Press the Datum button. Measure toolbar > Datum button 3 Probe the desired point and press the Enter button or in the Measure Prompt window. The point will be probed. Measure toolbar > Enter button or Measure Prompt window 4 Press the Done button to complete the measurement and enter the part datum point into the Feature List. Measure toolbar > Done button Constructing a Skew and Part Datum Point from Parent Features The skew alignment and part datum can be constructed from one or more parent features that are contained within the Feature List when simply probing a desired point or skew line is not convenient or possible. Supported point and line constructions are specified in Constructing Features later in this section.
Skew To construct a skew line from a pair of positional features (two circles in this example): 1 Press the Skew button. Measure toolbar > Datum button > Skew button 2 Select the desired parent features or features in the Feature List, such as two circles.
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