Corkscrew


Warning this is an experimental section which may disappear. The problem corkscrew is attempting to solve is to identify logs which will be unstable in the horn's down position at stembucking. At this time, we assume these logs are ones with a minor sweep that is orthogonal to major sweep. This is enough to throw the log off balance.

The corkscrew test is done after all the other cuts in the stem analysis phase but before using solver to optimize the logs. A corkscrew cut will divide unstable logs before they go to solver.



Technical Note

The current method considers the log 8ft on either side of a ring. The sweep is measured in both directions, the larger sweep determines the major direction, the smaller one the minor direction. The threshold is compared to the minor sweep times the sin of the angle between the horns. [Note sweep here is the quadratic approximation given by the HornAngle function of the Sweep class.]

The parameter StemCorkscrew controls the value used to test the stem. Smaller values of StemCorkscrew will make the test easlier to satisfy and hence more stems will be cut.


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