This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Just reading David Nereson's post about the old Blüthner he takes care of. He comments: "Can't regulate let-off in the piano -- no way to get at the regulating screws." Which brings up an important point for me. How DO you regulate hammer height and letoff in the grand piano? The method I learned is: Pull the action, measure string height at the extremes of each section using a string height gauge and a busines card; put the action on a nice, firm, flat surface (I know that this is the place where errors creep in, if the keybed and the work surface are not both quite flat); use a contraption to simulate string height; and regulate hammer height, letoff, checking, drop, etc outside the piano. In some situations I have had to do an on-site regulation where there is no good, flat surface for the action, so I've tried to do it in the piano. I can't see how you can do a good job with it. Feeding a hammer blow gauge through the dampers, turning it 90 degrees and pulling it gently up to contact the undersurface of the string, and holding it there while trying to get an eyeball on the hammer surface from the front of the piano and using the other hand to regulate the capstan ... difficult enough to do samples but what a challenge to do them all that way. Very hard to get a good line of sight over the hammer flange under the pinblock. So I have resorted to approximating, measuring only a few, pulling the action into my lap and eyeballing the tweeners. I *know* the results are not as good as what I could do on a good bench. Same issue for letoff, and same for backcheck. No doubt you more experienced folks have developed fast, efficient, easy ways to do this. Please enlighten. Does Bill Spurlock's description sound like what any of you do? "hunching over the stretcher, peering past the dampers and through the strings to judge let-off distance, then looking under the pinblock to place the tool on the adjusting screw, then leaning forward again to watch as you make the adjustment. All the while you must "squeeze" the key gradually to slow hammer movement enough that you can accurately see the let-off point." | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Jason Kanter . piano tuning regulation repair jkanter@rollingball.com . cell 425 830 1561 serving the eastside and the san juans ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/14/cb/7c/e2/attachment.htm ---------------------- multipart/alternative attachment--
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