Well, I was thinking that if the holes on the apron are closer together than the holes on the jaw (the outer part), then the whole jaw would bend...Maybe the same thing would happen if the wholes were drilled out of parallel to each other (not sure how to explain this one, but if the holes aren't in the same plane, then when the vise is closed, the jaw may bend too). As I don't have a drill press, I've been thinking about the accuracy of drilling on cheap drill presses...and whether its worth buying one.
The SYP probably bends more than a hardwood would. It turns out I have too much curvature in there still. I probably wont' do the curve thing in the real version and just use some leather to take up any unequal pressure. But can you elaborate on how you think the drilling screw holes affected it?
Nice work. I'm in the process of doing something similar - but I'm sticking to 2 screws (for now) Do you think that the wood you used for the jaw may have something to do with having more pressure at the ends then in the middle, when set up as a twin screw? Could it also be caused by how you drilled the holes for the screws?
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