IMHO Ron Nossaman's advice on drilling a bunch of test holes is spot on - I always do that with every block. The first time you drill a different type of block you'll be drilling more test holes. Drill bits get dull, drill chucks have different amounts of run-out, different techs will use different feed rates, etc., etc. If you are doing an open pinblock, are you putting a nice veneer of hard hardwood on the upper face? You can really make that area pretty if you do. Below is a picture of an open pinblock made of multilam maple, an 8 mm Delignit pinblock cap and about a 1 mm veneer of some a South American tropical hardwood called Jatoba. Jatoba looks a lot like mahogany (that's what the piano case was) and is extremely hard (figured that would work well on the pinblock top. Jatoba has a Janka hardness rating of 2350 - whereas hard maple has a janka hardness rating of 1450. -------------- next part -------------- A non-text attachment was scrubbed... Name: DSCN3151.jpg Type: image/jpeg Size: 114662 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100930/6dbaaed6/attachment-0001.jpg> -------------- next part -------------- Terry Farrell On Sep 23, 2010, at 8:33 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. > ........??? > > Thank You > Dave Renaud > > > > >
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