Hi Ed This is what I usually do, almost. I have a small double square that allows me to square the hammers to the strings. I remember reading your post on this about 3 years back and made my self a nice selection test hammers to do this. In this case, measuring this way agreed very well with the results I got from using the string height to keybed measurement with the action in the piano. I havent been back to look again today, but something about this Petrof has to explain the difference between <<in piano>> and <<on bench>> measurements using the string height method. Cheers RicB A440A@aol.com wrote: >Greetings, > I have a variety of bore lengths in a set of trial hammers. These >have a centerline inscribed on both sides. they are mounted on shanks at exactly >90 degrees. I put them in the action, reinstall the action, lift the trial >up to the string,(damper is removed for this), and put a small square on the >string to see what bore length gives me a 90 degree angle upon contact with the >string. If the piano is going into a heavily used venue, I will often add a >mm or two to the length so that the longevity of the hammers usefulness is >increased. > This method sidesteps the fact that strings are not always parallel to >the keybed,(particularly in the top sections of Steinway grands.) Sometimes, it >would be necessary to bore longer than there is room for in order to make >everything 90 degrees, so then a few degrees deviation from 90 on the hammer >shank allows the hammer to strike the string at 90 degrees and still be able to be >regulated. >Regards, > > > >
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