Hi folks.. just got through double checking a measurement for borelengths on a Petrof grand and noticed a rather large discrepancy between on bench measurements and in piano measurements... and ended up with the following observation resulting in the accompanying question. Measuring the distance between strings and keybed, then hammer centers and keybed yeilded a near 2 mm difference when done on the bench visa vi done in the piano. At first I thought that well..... its a bit clumsy to measure in the piano.... so.... But then I got to thinking about bedding issues and decided to double check very closely in the piano and came up with very close to the same results. Obviously in this particular example, the bedding screws accounted for a quite significant difference in the height of hammer centers. This of course is directly reflected in the bore length one decides on, so its kind of important to get the darned thing right. I ususally go about deciding bore length in a different fashion, but have lately wanted to try out this <<formula based>> method and stumped on this right off. So what do you folks do here ? Go with a bench figure, compensate for the bedding on the bench, or simply measure in the piano ? If the bedding screws are taken into account... do you always make sure of optimal bedding first ?.. I'd like a bit more detailed description of what you all do in conjunction with this on the surface simple measurement. Cheers RicB
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