The radius moves before and after engagement with the material are helical. This is done so the tool does not drag across the surface of the material. Helix Clearance is the distance in Z between the start and the end of these helix moves.
Example
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This is a top view close-up of the helical
radius move. This is the side view. The arrows indicate
the Helix Clearance.
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The following indicates a helical radius move, where the helix clearance takes place.
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