On Fri, Jan 1, 2010 at 11:40 AM, David Love <davidlovepianos at comcast.net>wrote: > Why would that be necessary? > Maybe not necessary. However, in general when I do any clamping I try to avoid applying pressure at only one point, because nothing is perfectly straight. Any trimming method which involves holding a thin 1/2 " bent ketstick during a router cut, or especially anything mounted on most drill presses, is prone to some inaccuracy during the 88 note run somewhere; probably not on every key, but probably on some or a few. Further, at least on the mineral plastic and theran, the plastic sometimes takes on a out of-plane-ness that needs to be straightened in the clamp. Clamping at only a single point tends to flex these slightly imperfect planes and clamp unevenly. The relieved caul gets around this possibility a little better. At least that's how I approach the problem. Other approaches obviously work for other people. Not a biggy. Jim I -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100102/2387a26e/attachment.htm>
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