Is this an uprigt or a grand? -----Original Message----- >From: David Renaud <drjazzca@yahoo.ca> >Sent: Feb 24, 2006 2:42 PM >To: pianotech@ptg.org >Subject: keybed spring > > Korlore & Campbell, for a music school, one year >old, tuned twice so far. > > Call for sticky key. > > Key is rubbing on the key slip. > > Upon removal of the keyslip, I notice how tight the >key slip screws are, and all the powder sawdust coming >out with the screw. > > Upon inspection the key slip appears straight. > > Placing the keyslip back, it touches the keybed >at the ends, but there is a bow towards the middle >with over a 1/16 inch gap at center. I push upward >on the bottom of the keybed with my thumb only and >watch while the keybed wood itself flexes up and down >in the center and also observe the keys rising and >falling. The keybed is a spring > > I notice that with the key slip removed the entire >middle of the piano has severly bubbling hammers. >Putting the keyslip back stops the bubbling, but >the keyslip rubs the front of the keys. > > I determine that the keybed is warping. The downward >pressure is forces the keyslip to torque >towards the keys. Tight key slip screws were due to >torque of bending the keybed upwards. The dust >coming out with the screws was the light material >developing stripped screw holes under the torque. > > Being a squeezed emergency appointment for a sticky >key , I comprimise by leaving one screw out so as not >to torque the keyslip and keybed together so much, >adjusted extra let off to eliminate bobbling hammers, >and said I would e-mail a report. > > I can not see a solution to this other then perhaps >putting a strip of plate steel under the keybed to >freeze it straight. With nothing but dust to screw it >into, bolts through would be required. > > I can bend the keybed about with my thumb alone. >How can one be expected to regulate that, the keybed >itself is a mushy energy absorbtion spring. > > The first time I tuned this piano I was impressed to >find a clean sounding chinese piano that was tunable. >I am not so pleased afterall. This is bad for >business, it smells of mechnical instability, >callbacks, and unresolvable issues. I piano I actually >can not work on mechanically > >1) Steel plate?? thoughts....... >2) How many have seen this.....other solutions > > I will try to fix anything, but this looks like >soft, spongy warping material that can not be worked >with. I feel it is a total waste of time to regulate >it, come spring everything will have changed >dramaticly. grrrrr > > Somebody is going to think up a fancy technical >name.....accelerated keybed spring action.....and >someone else is going to think it is a good idea and >patent it.......sorry..... > > Feeling dramatic > Dave Renaud > > > > > > > > > > > > > > > > > > > > > > > > > > >__________________________________________________________ >Find your next car at http://autos.yahoo.ca >_______________________________________________ >Pianotech list info: https://www.moypiano.com/resources/#archives
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