Site variables in this process group control the following:
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Whether a bar with a hole is recognized as a tube. See Tube Recognition.
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Whether some parts are recognized as custom extrusions. See Extrusion Recognition.
To view or modify these site variables, click Tools > Digital Factory Toolset > Process Group Site Variables > Bar & Tube Fab.
Tube Recognition
aPriori groups round stock into three ranges by the OD (outer diameter) -- thin, medium and thick.
Variables maxThinRoundTubeOD and maxMediumRoundTubeOD determine which group a particular stock is assigned to. Other variables determine whether the stock is a bar or a tube within the group.
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For the "thin" group, aPriori selects tube stock when the ratio of wall thickness to outer diameter is no greater than the value of the site variable maxThinRoundTubeThicknessToODRatio (0.15 by default).
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For the "medium" group, aPriori selects tube stock when:
ID >= OD*mediumRoundTubeMinIDFactor-mediumRoundTubeMinIDIntercept -
For the "thick" group, aPriori selects tube stock when:
(OD-ID)/2 <= thickRoundTubeMaxWallThickness
where:
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maxThinRoundTubeOD (30.4mm by default) - Maximum OD for the "thin" group.
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maxMediumRoundTubeOD (141.3) - Maximum OD for the "medium" group.
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mediumRoundTubeMinIDFactor (0.8) - Coefficient in the medium group formula above.
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mediumRoundTubeMinIDIntercept (14) - Coefficient in the medium group formula above.
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thickRoundTubeMaxWallThickness (25.4) - Maximum thickness of a wall for a "thick" tube. Wall thickness is (OD-ID)/2. If wall thickness exceeds this value, the part is presumed to have been made from the bar stock. So if you have material that exceeds this value, which you want to process through roll-bending, you should increase the value of this site variable accordingly.
These site variables are ignored if you select round tube stock in the stock orientation tool.
Extrusion Recognition
Extrusions are recognized only if the site variable enableGenericExtrusions is set to true, the default in starting point Digital Factories. You can disable extrusion recognition by setting the variable to false.