Had a broken wire in computer so I reckon you can guess the rest Thats a neat routine Roberto thanks. My usual method is to copy paste the reference line to same place then just rotate 90 about its end or draw a line from somewhere and perpendicular to the reference line then move it. the line command and hover over an endpoint of a polyline edge from which you want to start a perpendicular line, until the small red trackpoint marker appears. Please try this: Make sure that (at least) the Endpoint and Extension entity snap mode flags are On (flags of the OSMODE setting) Start e.g. Ill play with this today and come back later with what I come up with. You can modify the guessing process to speed convergence to a solution. If s is less than r determine a new point p2 further out from the intersection of the two lines. ![]() The center of the fillet is on this line but where We know that arc center is a distance r from either line (measured perpendicular to the line) and from the point p.
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