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ST7-1.50.20.9 Modelling a Helix or Spiral
Modelling a helix or spiral in Strand7 can be done using Tools/Extrude/By Increment with a cylindrical UCS.  First, create a cylindrical UCS at the centreline of the helix. Create a new UCS using Global/Coordinate Systems. Choose Cylindrical under System. Choose ZX under Type, or choose the plane which appropriately aligns the Z axis with the axis of the helix. If you have a node at the centreline, activate the Origin node hotpointer and select the centreline node. Click Apply. Create...
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