Don't know how others have handled large radii, but I've used the string routine (can be a little wobbly though) - also strip of cardboard with hole punched through for pencil and radius point (a little less wobbly - reinforce the radius point hole so it doesn't enlarge on you) - I have access to cadd software with a large format plotter and can draw and plot out very accurate full size templates, which is what I normally do.
By the way, "NTS" usually means "Not To Scale", referring to the plan drawing.
If it would help, you could e-mail me the plan and I could calculate "chord offsets" or middle ordinates for you that would allow you to lay it out without a bean compass. |