Theme: PCB outline, shape of the board, copper layers, layers
How do I get a semicircular breakout at the edge of the board?
The PCB outline is a closed polyline that also may contain curves (tori and splines). Normally on layer 23 = PCB outline. You must use the "Trim lines" function for the breakout:
(Image 1: Circle exactly on the edge)
The function "Trim lines" can be found in the "Actions" menu. Thereby two intersection points are found. The circle divides into two halves and the upper edge into 3 parts:
(Image 2: Semicircle and line segment selected)
Now select and delete the two superfluous elements and the line ends and the arc ends will meet exactly:
(Image 3: Exactly closed polyline)
The 3D view of the board also only works correctly if the polyline fits together perfectly.
(Image 1: Circle exactly on the edge)
(Image 2: Semicircle and line segment selected)
(Image 3: Exactly closed polyline)