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For Specify direction enter a value or expression for er. The default is (1, 0, 0). The direction is specified in the selected coordinate system.
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For Select a parallel edge an edge can be selected on the Rack Axis subnode, which is added automatically. The vector from the first to the last end of the edge is used to define the rack axis. Any edge in the model can be used. Select the Reverse direction check box to reverse the direction of the rack axis.
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