Another 'D'

[Avery Todd]

Hi Jeannie & Richard,

Since I promised to not let this run long AND since you are the
only two who've responded, I'll go ahead and tell you what I
finally found. You're both wrong but good guesses, anyway.

The pin from the damper tray which goes into a block on each end
was just a little loose in the guide block on the treble end. I
could hold the tray with my hand and hear a very slight noise &
feel a very slight looseness. If I put a screwdriver between the
tray and the block, twisted it a little to put a little side
pressure on the tray, the noise would stop. After I removed the
block and looked at it, it seemed that for some reason, the hole
had enlarged a little in almost an oval shape where the pin enters
the block and on kind of a sharp blow with the pedal, it would
cause a wood rattle kind of noise.

Besides the felt punching already there on each end, I noticed
that on the bass end, there were a couple of center rail thick
cardboard punchings. So I though, why not? I put a thick(ish) one
in on the treble end reinstalled everything and the noise was gone.
I don't know how long it'll last. I may have to do something with
the block later but for the moment, everything is quiet. :-)

Thanks for the posts and I hope this is just something you can file
away in your little bag of tricks for future use.


Regards,
Avery


>Avery,
>Often, when using the pedal, it flexes the keybed just enough to 
>cause the frame to need bedding.  In other words, this "woody" sound 
>could be the keyframe knocking.  When I bed a keyframe I always 
>double check for noise
>with the pedal depressed.....otherwise the results can depress me! 
>Am I close?
>
>jeannie

>The top of the damper stop rail was the culprit, with to little clearance
>on top combined with just enough pressure from the pedal system shove it
>just that hair extra too high ?
>
>Probably way off... but what the hey :)
>
>Richard Brekne

>-----Original Message-----
>From: owner-caut@ptg.org [mailto:owner-caut@ptg.org]On Behalf Of Avery
>Todd
>Sent: Sunday, February 03, 2002 11:12 AM
>To: caut@ptg.org
>Subject: Another 'D'
>
>
>List,
>
>I've already corrected this problem but just wanted to see if any
>of you had ever run across this before. I never have and it took
>me a little while to diagnose it.
>
>Anton Kuerti noticed a slight wood type of rattle when the sustain
>pedal was depressed fairly hard. We both could tell it was coming
>from the damper tray area, somewhere.
>
>It wasn't loose screws and the noise seemed to be coming from the
>treble end of the tray area. The piano was rebuilt in 1996 and has
>ALL new parts.
>
>I won't let this little "puzzler" run past Monday if no one gets it
>and how I corrected it. We all have better things to do than play
>guessing games. Don't we? :-)
>
>I just thought it would be a useful thing to know. Just in case........
>
>Regards,
>Avery