<HTML>In a message dated 12/20/2002 5:36:27 AM Pacific Standard Time, mcpiano@globetrotter.net writes: <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">. >Marcel wrote: > >>To me, after the crowning process, the board should not >be dried again. I >>think that high temperature MIGHT affect the glue >hardness and cause crown >>collapse (a little at least). > >Please explain what you mean by "high temperature". And why >would it be used? > ></BLOCKQUOTE>                          Marcel                          I often keep the boards in the hotbox after they are pressed at what ever temp needed to keep the rh between30 and 40% which is often 70 to 80  degrees in a high humidity sesaon. However it doesn't hurt any thing if the board is dried down to it's pre-ribbed state of say 90 degrees and 25 to 30% R.H. Even if you glued the board to the case in that dry it will still regain whatever crown was lost due to being redried when it gains moisture content.Besides whatever crown there is due to the ribs being crowned is more than ample, even in the driest conditions. Purely              Compression crowned panels will suffer greater losses of crown under the conditons described above and will have very little or none if they were'nt carefully dried to about 4.5% EMC before ribbing instead of what Peter posted earlier describing basically no drying at all. Peter, what were you thinking?   Next time call 911 -pianotech list.     Regards --Dale </HTML>