From time to time, we come across assemblies that are quite large (16"×16") and quite flexible. They may be standard 0.062" boards, but they're loaded with a lot of large, heavy parts. When you put a lot of heavy parts over a large area, it's a perfect recipe for board warpage. We recently had a job with just these conditions. We have supports on the fixture to help with this phenomenon. They're aluminum bars that are self-supporting on the fixture, with a spring-loaded hook that tries to pull up a heavy board so that it remains flat and does not bow down. But even with these aluminum support bars, the board still wanted to bow down.
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