Nothing wrong with that approach Greg. For me, that approach has two limitiations though - too darn hot on the driveway this time of year, and my shop is only 40 feet long..... Otherwise, I've done it like that before - fast, easy, accurate - how can you improve on that? If you want to be real accurate though, I've used thin piano wire to avoid stretching a string and one needs to be sure to have the string/wire attached to the pencil down near the point so as to not be moving the point back and forth perpendicular to the arc tangent. Or maybe we're both fools...... ;-) Terry Farrell ----- Original Message ----- From: "Greg Newell" <gnewell at ameritech.net> To: "'Pianotech List'" <pianotech at ptg.org> Sent: Wednesday, August 06, 2008 11:25 PM Subject: Rib Radii > David and list, > I'm wondering, as I write this, if I'm gonna look like a fool yet > again for posting what is probably obvious to everyone. If I remember the > question correctly you asked how one cuts the radii not how one measures > or > makes it. My procedure was to take a sheet of hardboard (that brown > compressed paper like stuff) and lay it out on the driveway. At whatever > radius I'm trying to make I lay out a string to that fixed point in the > driveway and attach a pencil to the string at the end which is now above > the > hardboard. Naturally this makes a compass with which I make the radius I > want. After cutting the hardboard on the compass line I just made I lay > that > over the wood or laminate that I want to make the rib out of and use the > router w/ guide sleeve to follow the hardboard radius I just made. Simple > enough but perhaps this isn't what you were thinking about. > > Greg Newell > Greg's Piano Forté > www.gregspianoforte.com > 216-226-3791 (office) > 216-470-8634 (mobile) > > > >
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