Hi Will, One issue I have with the Crownulator is that boards do not necessarily (necessarily don't?) crown in a nice even radius. Rather, they tend to be variably crowned. I doubt that's news to you, so I'm posing this more as a question of whether or not you are comfortable with that limitation, and with working around it using Jude's gauge. I'm sure you've probably taken readings at various placements along a particular rib - what does that tell you? Thanks for the insight. William R. Monroe On Wed, Jun 22, 2011 at 7:17 PM, Encore Pianos <encorepianos at metrocast.net>wrote: > Hi David:**** > > ** ** > > I’m going to throw in my 1 ½ cents here for what it’s worth to you and > others. I do some things a little different than you do.**** > > ** ** > > Let me start by saying that I think there are better ways to measure crown > than the method you describe. I used to measure by way of the string method > more or less as you do. It’s slow, awkward, and probably not terribly > precise. **** > > ** ** > > About a year ago, I bought a Crownulator from Jude Reveley. It is made up > of a 1 ‘ long steel bar accurately flattened on one side. In its center is > a hole through which passes the moveable foot of a dial gauge. You lay the > bar square on the panel next to the rib. As long as there is positive > bearing, the dial gauge foot will move a distance that will be measured on > the dial. It’s a mirror image reading, so if the gauge is reading .080 (of > a full circle of .100), this means that you have .020 of crown over that 1’ > span. There is a formula by which you can drop the numbers in and calculate > the crown for the rib.**** > > ** ** > > I use it when putting in new boards too. After the board is glued in and > otherwise ready to go for stringing, I take a crown reading on as many ribs > as I can get at and record those measurements. When setting bearing, drive > the board down and take crown readings til I get my target of 50% > deflection. Record those measures. Then string and tune the piano, measure > crown again and see how well I guessed in the process**** > > ** ** > > I think you would find the Crownulator significantly more accurate, > quicker, and far easier to use. **** > > SNIP > > Will Truitt**** > > ** ** > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20110622/c6911f7e/attachment.htm>
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