Not in my world. Not even with pipe clamps which don't flex like bar
1. The clamp faces apply pressure exactly in the centers of the edges, and
2. All edges are perfectly vertical, then...
the work pieces may wind up flat.
That doesn't happen in my world. I tweak flatness by loosening/tightening
top and bottom clamps while checking the glue up surface with a straight
edge. Even with that it is normal for me to wind up with a slight (1/64 -
1/32+-) bow, not to mention lippage, neither of which bother me because
eventually the glue up will be flattened on a drum sander.
Just make it a moot point. Since not all clamps apply forces in the same
plane, especially on wide glue ups where your clamp selection is
mixed/limited and the "you can't have too many clamps" theory fails you,
you can always force the issue if need be, easily and cheaply, thusly:
Where there's a will, there's a way, even it include bags of cement,
bricks and/or other heavy implements/tools:
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