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.

• For the "thin" group, any ID (inner diameter) results in a tube.

• 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:

• maxThinRoundTubeOD (30.4mm by default) - Maximum OD for the "thin" group.

• maxMediumRoundTubeOD (141.3) - Maximum OD for the "medium" group.

• mediumRoundTubeMinIDFactor (0.8) - Coefficient in the medium group formula above.

• mediumRoundTubeMinIDIntercept (14) - Coefficient in the medium group formula above.

• 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.