[pianotech] Noisey pedal bracket

[Richard Ucci]

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
>
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