[schwartzenegger]You must vuse de formulars![schwartzenegger]
If its one pipe by itself, I'll eye-ball it. Thumb and feel.
If its 30 next to each other, I use the multipliers, and a magnetic protactor, levels, calculator, chalk-line, lasers of varying types, and a fresh jolt of coffee.
I just got done with a job doing about 20,000'+ of 1/2" and 3/4", all exposed for an Arch's office. If I saw anyone eye-balling I'd throw a fit, if not an object. I had under 10% waste, not bad considering, the amount that actually got bent. 50%
Mark Heller "Well - I oughta....." -Jackie Gleason
One of the conduit bending sites had a great trick. A standard hickey is 30 degrees with the handle straight up so you use 30s for your offset and the magic number is 2. So if I want a 2" offset I put the marks on the pipe 4" apart and line it up to the first mark on the hickey, bend them until the handle is straight up.