Tom Veatch (Wichita KS US) wrote:

Assuming a caul with uniform stiffness - EI is constant along the
length of the caul - to get uniform pressure along the clamping
surface, the shape of the caul should be:

Y = Ymax * ( 1 - 3.20 * [ (X/L) - 2*(X/L)^3 + (X/L)^4 ])

where X is distance along the caul, L is the length of the caul
between the clamps at each end, Y is the chord height at any point
along the caul before applying the clamps, and Ymax is the maximum
chord height at the clamp location at each end.

The clamping pressure exerted by the caul - force/unit length. - is
given by

Q = 76.8 * EI * Ymax / L^4

where Q is the clamping pressure, EI is the caul stiffness (E =
Young's Modulus of the caul material, I is the cross section moment of
inertia) and Ymax is the maximum chord height of the unloaded caul at
the clamp positions.

This is information I can use (and I've already backed it up for
safekeeping).

Thank you!

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/