This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I think the comment I heard was "get it as close as you can on the = bench". There is always a good flat surface you just need a thick = blanket so you don't scratch the lid. When you adjust everything to = samples, the key bed can just lay flat because when you put the action = back in the piano everything adjusts back into place with the samples. = Then because string height can vary note to note, fine adjustments must = still be made in the piano. Try taking a gauge a mm longer and then the = hammer should bobble slightly when you drag it down the string. That is = easy to see the low ones. I take my folding keyboard stand to use as an action table. kpiano ----- Original Message -----=20 From: jason kanter=20 To: Pianotech=20 Sent: Tuesday, February 01, 2005 10:00 AM Subject: Let-off in piano Just reading David Nereson's post about the old Bl=FCthner 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." | | | | | | | | | | | | | | | | | | | | | | | | | = | | | | | | | =20 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/e1/5e/17/32/attachment.htm ---------------------- multipart/alternative attachment--
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