It's the expanding action brackets. You can get new ones I believe. The company that was making the actions for YC had a bad batch of pot metal when the made the brackets. It was under warrenty and takes about 5 hours to change them out. Keith Roberts On 9/25/07, Cramer, Mark <Cramer at brandonu.ca> wrote: > > I worked on a 15-year-old Young-Chang grand for a new client today, and > the action has REAL problems. > > Some of the issues I've either seen before, or read discussions about here > on our list, i.e.: "bad knuckles & seized action centers." > > However, one thing has me perplexed, and as I don't see very many of these > instruments, would appreciate the experience of you those of you who have. > > The big question is why "ALL" hammers were blocking at the strings? (no > let-off) > > I gave all the buttons a quick 1/2 turn down and went ahead with tuning > and assessment. What set me off though, is this is the same intial > intoduction I had to one other Young Chang grand, four years ago, and I've > yet to solve it! > > With that instrument, I followed the initial visit several weeks later > with a re-tuning and a one-day regulation. That particular piano appeared > much like brand new, and I was quite pleased (read "smug") with the results. > > When I returned six months later however, let-off had dropped below the > point of drop contact! (?) > > I spent a 1/2 hour poking around for clues... loose let-off rail, change > in humidity, loose action brackets, severed key-bed, loose plate fit, etc., > but came up "empty." > > So, I restored let-off, tuned, and left it at that. > > A year later the client had moved, and I returned for tuning. The hammers > were blocking once again! Yipes! > > Now, seeing this symptom on another YC has me wondering what's at work > here? Can anyone shed some light? > > BTW, I've read in past about YC action brackets "growing". > > I've seen that about twenty years ago on a mid-century "Zimmerman" (East > Europe/mid-quality). In that case, I had a machinist mill new brackets from > aluminum. Nice work, but the orignals were so messed that determining > original dimensions was a real chore! > > Neither bracket-sets on either of these actions though have the cracks and > "bloated" appearance those Zimmerman brackets had. > > Any clues? > > much thanks! > > Mark Cramer, > Brandon University > > > > > > > > > > > > > > > > > > > > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20070925/f4b5991e/attachment.html
This PTG archive page provided courtesy of Moy Piano Service, LLC