We add Coincident Constraints so that the length of the sketch-loop at its base is always equal to the length of the Part.
See image
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Notice, in the image above, that the Points at the centre of Arcs When the two Points are Coincident, they look like: ' When the two Points are Merged, it looks like: '+'. |
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Do Add Coincident Constraint with the other two arcs in the sketch-loop. Coincident: Point to Point
Coincident: Point to Line, X-axis or Y-axis
The centre-point of each Arc is coincident with the start-Point of the CAD-Line and the Y-axis. |