>We could use a higher vacuum to glue the panel to the ribs, but the higher >the vacuum the greater the risk of distorting the panel down between the ribs. At what price? If the jig holding the possibly not perfectly thicknesses and contoured ribs failed to position the ribs such that the contours of the crowns of consecutive ribs weren't contiguous (projective??) across the entire under surface of the panel being formed over them, wouldn't some allowable distortion of the panel allow compliance of the panel to the rib contours since this assembly method doesn't allow compliance of the ribs to the panel? Something has to met something half way when the parts being assembled are less than perfect - as will be the case in real production, and if this allowance isn't built into the assembly method, it isn't going to happen. Ron N
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