Originally Posted by R.DesJardin
That is the way I've always seen it...
There are two things in play here the angle and the location
I'e made many custom protractors but over time I have given them away because it soon became apparent that I not only wanted the angle but I also wanted the location of the angle.
To do that I found that an inexpensive Digital level ($35) gave me the angle more accurately. Pick the first line, then zero the level, then take the rest of the angles based on the first zero a bunch more accurate.
To get the location...
As R says: I use strings and straight edges to get locations
Finally I have a few bent pieces of tube that I can actually put in place to see "What If" in real time.
While I can and do use Bend-Tech to simplify things. I still, on anything that is even semi-complex, measure the angles and the points to compare and make sure that I don't have something FUBAR. .. . . .