I am new to draftsight and I have been trying to figure out how to generate a 2D-tooth system according to DIN5480 using draftsight. Still, I have not found a solution or even a starting point. I mean an involute spline. Maybe following link might help you to understand what I am searching: http://www.hexagon.de/info97/index.htm Can somebody give me a hint. Thank you in advance!