The Bending Line also defines the angle and radius of the bend as well as the width of the strip of board surface that is being bent. The Bending Line defines where on the surface of the flex region that the bend is to take place. To define how a flex board should bend, you place one or more Bending Lines.
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The Split Line will remain blue while dragging to a permitted location that will still result in a valid split. The cursor will be constrained to the current snap grid.
#Meaning of double line in altium designer pcb movie
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