framah:
Sorry you don't believe - I really could care less, although I have to admit it does sound rather high. I actually never measured it myself but the guy who taught me the method that I use gave me that figure - he is a scientist/perfectionist and I tend to believe him (and he has the tools to measure such things with). Do it by hand - oh goodness, I would never do that, nor ever have. This guy's method is not a machine really, but is super simple, cheap, and does not involve canvas pliers, thank goodness - takes about ten-fifteen minutes per frame from start to finish (this is his design and I'm not at liberty to share). The BC canvas holds up well to this pressure, the prints are indeed "drum tight," perfectly even all the way across, and don't ever sag (I've stretched prints up to eight-feet long with no worries). Warp the frame? Not if you use proper braces - never had one warp.