Thanks Barb Rick Ucci/ Ucci Piano www.uccipiano.com On Nov 16, 2010, at 8:58 AM, Barbara Richmond <piano57 at comcast.net> wrote: > I had to rebush many hanger brackets YC pianos a long time ago. I > don't know what they were contaminated with, but no lubricant would > quiet them. Maybe an adhesive had seeped through the felt. The > problem then wasn't rebushing, but working with the damaged screw > heads that held the brackets in place. I remember calling the YC > service rep at the time and asking for screws to have on hand. He > sent some and they were damaged, too. Apparently he had taken them > off a junked action... > > Barbara Richmond, RPT > near Peoria, Illinois > > ----- Original Message ----- > From: "Richard Ucci" <richarducci at comcast.net> > To: pianotech at ptg.org > Sent: Tuesday, November 16, 2010 7:24:59 AM > Subject: Re: [pianotech] Noisey pedal bracket > > Guys, I'm going to try this again. > The noise I'm talking about is from the brackets at the back of the > action that hold the damper lift bar in place. There are three of > them that make a scratchy noise when the rod moves . How is the best > way to remove and lube? > Thanks, > Rick Ucci/ Ucci Piano > www.uccipiano.com > > > On Nov 15, 2010, at 6:27 PM, John Ashcraft <jaashcraft at gmail.com> > wrote: > > I reworked a Yamaha-built Everett studio that was a wonderful piano > in every other respect. > > The trapwork was designed to fail. The fulcrum should be on a line > (or in the vertical plane containing the line) connecting the force > at the pedal end with the load at the dowel end: another magic line, > perhaps. When they put that strong spring off the line, they forced > the bracket to try to absorb the torque/twist. (Works long enough to > get it out of the factory and past the free tech visits.) After > trying many other approaches to removing the noise, I used a hose > clamp to hold an upper spring support at the side of the trapwork > tube, made a shallow hole in the bottom board at the correct > position, and moved the spring sideways to put it in line with the > force and load. Problem solved, at least until the fulcrum bracket > fails. > > John Ashcraft > > > On Fri, Nov 12, 2010 at 8:28 AM, Ryan Sowers <tunerryan at gmail.com> > wrote: > This is one part of piano manufacturing I just don't understand. I > service 100 year old uprights with simple wooden trapworks that work > smoothly and noiselessly. These modern metal trapwork systems are a > constant source of problems - it seems that every tiniest noise is > greatly amplified, and sometimes transmitted through the parts > making it very difficult to isolate the source. > > The plastic spring cups break, the bushings wear out, the rubber > grommets squeak and wear out prematurely, the brackets seem to > click, etc. This is one example of "they don't make them like they > used to" and its a sad thing! It seems like Yamaha went with this > system and then every other Asian manufacturer followed suit. > > > On Fri, Nov 12, 2010 at 5:52 AM, Barbara Richmond > <piano57 at comcast.net> wrote: > Scratchy sound? What part is doing it? > > On Yamahas there is a nylon (or whatever it is) spacer/nut on the > prop under the pedal that can squawk. No amount of lube will help. > You need to detach the pedal from the bottom board, detach the pedal > prop from the lever. Put a leather punching--lubed with your > favorite grease--between the nylon nut and the pedal. Reassemble. > > That's the fix for that squeak. > > Barbara Richmond, RPT > near Peoria, Illinois > > > > ----- Original Message ----- > From: "Richard Ucci" <richarducci at comcast.net> > To: pianotech at ptg.org > Sent: Friday, November 12, 2010 7:10:13 AM > Subject: [pianotech] Noisey pedal bracket > > List, I know this has been covered before , but... > How do you eliminate that scratchy sound on Asian uprights when the > sustain pedal is played? > What is the procedure used? Remove brackets and lube with pianotech > glide stuff? > > Rick Ucci/ Ucci Piano > www.uccipiano.com > > > > > -- > Ryan Sowers, RPT > Puget Sound Chapter > Olympia, WA > www.pianova.net > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101117/cd002286/attachment-0001.htm>
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