On 9/23/2010 7:33 AM, David Renaud wrote: > For a Boesendorfer grand I have laminated 3/8 delignight for the > open faced top sections onto 1.5 inch bolduc block. Fit seperately > and glued togther. > The suggested bit for Bolduc's block is smaller then the suggested > bit for delignite as Maple has so much more give. > > Can those that use, or make composite blocks share their > experience. I'm considering drilling with the Bolduc > bit and following up with redrilling for the delignite 3/8th deep only. > ........??? Hi Dave, I don't see the point in wasting an expensive block as a backer under the Delignit. I use, and recommend, the cheap supply house rotary cut multilam block. I drill two pass, 1/4" followed by 6.8mm, all the way through. This produces torque in the 160 in/lb or so range even though this is way too big a hole, theoretically, for the multilam. You don't need, or want, a high torque fit at the bottom of the pin. That's part of the design of the block, and that's where the tuning control comes from. Make up a test piece and try it. Ron N
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