Hi David, The piano wouldn't regulate in that the let-off buttons were all the way up, but the let-off was still in the 1/4" range. Thanks for the reminder about the bass hammers clearing the pinblock; I'll take the action back to the piano before installing the hammers to check on the strike point and the clearance. Respectfully, Jon >In what way would the action not regulate? Have you checked to be sure >that the bass hammers will go in under the pinblock with the added length? >If you have changed the bore distance, you have changed the strike point so >it is important that you test this in the piano before you glue everything >up. It is worth a trip back to the piano if you are not sure. There is no >law which says that all hammers must be hung at the same distance, but it's >not a bad idea to aim for it. The bass and tenor are not sensitive to >strike point the same way the treble is but I would be concerned about >adding so much length to the bore. If there is an overcentering problem, >you can always rake the hammers back a little. Some makers, by the way, >set hammers up to overcenter just slightly for various reasons. > >David Love >davidlovepianos@earthlink.net > > >> [Original Message] >> From: Jon Ralinovsky <ralinoj@muohio.edu> >> To: <pianotech@ptg.org> >> Date: 11/11/2003 4:59:22 AM >> Subject: grand hammer hanging question >> >> Hello, >> I'm rebuilding the action for a 1968 Kawai Model 600 (6' long). The >> hammers are hung in a straight line, but the distance from the hammer >> flange center pin to the center of the hammer molding tapers from 4 >> 7/8" in the treble to 5" in the bass. The top hammers sounded decent >> before I took the action out of the piano; unfortunately, I didn't >> check the case parts to see if I could move the action in or out. Is >> there any reason that I shouldn't duplicate the original specs? Is >> it important that all the hammers are hung at the same distance from >> the hammer flange center pin? If it makes any difference, I did >> change the bore distance of the hammers from 2 3/16" to 2 3/8" in the >> bass and from 1 7/8" to about 2 1/8" in the treble; this was done due >> to the hammers overcentering and the action not being able to be >> regulated. I look forward to your responses. >> >> Respectfully, >> Jon >> >> -- >> Jon Ralinovsky >> Piano Technician >> Department of Music >> Miami University >> 513/529-6548 >> _______________________________________________ >> pianotech list info: https://www.moypiano.com/resources/#archives > > > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives -- Jon Ralinovsky Piano Technician Department of Music Miami University 513/529-6548
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