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The main challenge with designing this diagram was deciding how to constrain it. A control loop diagram can look any way you want it to so the possibilities were endless. I first decided that I would constrain my design by limiting myself to one 12” x 12” sheet of acrylic. The reference lines around the CAD shown above represent the sheet of acrylic that this piece will be cut out of. While the CAD above shows a lot of dimensions called out, I actually designed most of it just by using reference lines and sketch relations. This made it a lot easier to mess around with the key dimensions. After I had the control loop diagram looking the way I wanted it too, I needed to make it one continuous piece. This meant that I had to delete the reference lines and replace them with dimension callouts. The CAD below shows the final part.


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