Perhaps overly simplified but I had played around with v-plot script on the http://2e5.com/plotter/V/design/ site and generated the PNG plot file. I then inserted the .png file as a canvas into Fusion 360 and did a calibration to the size of my current machine, this is a trick you can use to be able to sketch on top of a photograph at scale!
My first attempt was done at my current machine dimensions at 10 ft top bar and sketched in a 4’ x 8’ board on top of the canvas. The problem areas are close to what I have experienced.
Orange: poor resolution
- Light Blue: too little tension in one of the lines
- Dark Blue: too much tension in one of the lines (and poor resolution)
- White: drawing area candidate
On my second drawing I set the calibration to 12 ft between the marks, and then overlayed the 4’ x 8’ on top, and it seems to fit inside the constraints.
@dlang as you mention this does not take things like torque, friction into account, but this helped me visualize the problem.