[pianotech] Noisey pedal bracket

[johnparham at piano88.com]

Rick,

I recently had a similar squeak in the damper lift rod on a Kawai
upright.  Watch the video on www.ptg.org>>> Journal>>> Journal Media
Files called Damper Lift Rod Hanger.  The second part of the video deals
with the squeak.  

Hope this is relevant.

-John Parham

> -------- Original Message --------
> Subject: Re: [pianotech] Noisey pedal bracket
> From: Richard Ucci <richarducci at comcast.net>
> Date: Tue, November 16, 2010 8:24 am
> To: "pianotech at ptg.org" <pianotech at ptg.org>
> 
> 
> 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
> >