Vector Group to Vector Group
Vector Group to Vector Group Relationships
Built with Shim and Gap applications in mind, as well as comparisons between sequential measurements, this Vector Group to Vector Group Relationship (VG to VG Relationship) computes a delta vector group defining the difference between two reference vector groups.
A VG to VG relationship offers the following property controls:
Proximity Settings define a cylindrical proximity zone that is used to control which vectors in the second group are used for comparison with the first.
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Maximum Radial Offset. Maximum distance from the origin point of the reference vector to consider in comparisons.
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Minimum Axial Offset. Minimum distance from the axis of the reference vector to consider in comparisons.
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Maximum Axial Offset. Maximum distance from the axis of the reference vector to consider in comparisons.
Nominal Relative Polarity Between Vector Groups optional selection is used to control the mathematical comparison of the vector groups.
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Opposing Direction. Used for shim and Gap applications where measurements have been taken from two opposing surfaces
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Same Direction. Used for sequential surface measurement where the same surfaces is measured a second time and the relative change in deviation is desired.
Gap Optimization evaluation Settings are used to both control the fit setting used in a relationship optimization and the default tolerances passed to the resulting vector group for reporting purposes.
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Minimum (Gap and Weight). The Gap value is an absolute value used to define the minimum gap threshold and low vector tolerance while the Fit Weight is the maximum fit weight on the lower or negative side of the optimization.
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Maximum (Gap and Weight). The Gap value is an absolute value used to define the Maximum gap threshold and high vector tolerance while the Fit Weight is the maximum fit weight on the upper or positive side of the optimization.
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Nominal (Gap and Weight). The Gap value is an absolute val- ue used to define the optimum or nominal gap threshold. The Fit Weight is the minimum fit weight used in an optimization.
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Gradient Steepness Factor. This value is used to control the rate of transition in Fit Weight applied when within the min or max thresholds but not at the nominal.
The Gradient Steepness Factor defines the how a relationship will influence the fit as it enters the desired gap threshold. Unlike a fixed constraint which is either on or off, the gradient control provides a means to control the transition rate of the fit weight as it moves from the max or min weight toward the nominal weight.
If the tolerance is very narrow, then the gradient steepness value must be set quite large (~500), providing a sharp drop off in influence. If the gap tolerance is larger then the gradient steepness can be set smaller (~50) which produces a slower transition.
Basic shim and Gap application would go as follows: