[CAUT] buzzing truck

[David Ilvedson]

Now that is something to think about...does the truck flex at under the pianist's playing?   Not a good thing if it did...
Do you have picture of this retrofit?   

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Ward & Probst, Inc" <wardprobst at wardprobst.com>
To: "College and University Technicians" <caut at ptg.org>
Received: 5/15/2008 1:17:57 PM
Subject: Re: [CAUT] buzzing truck


>Dave,

>Wheels wear out, trucks usually don't. We install a vertical brace between
>the truck plate and a bean to stiffen the assembly. Anecdotal reports are
>that it improves the touch and tone. The brace is black pipe cut and
>threaded to size with floor flanges fastened to the parts at each end. 

>HTH,
>DP
>Dale E. Probst, RPT
>Ward & Probst, Inc.
>Wichita Falls, TX 
>mailto:dale at wardprobst.com
>www.wardprobst.com



>-----Original Message-----
>From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
>johnsond
>Sent: Thursday, May 15, 2008 10:03 AM
>To: College and University Technicians
>Subject: [CAUT] buzzing truck


>Hi all-

>The truck on our #2 performance piano has a problem buzz.  It has been 
>elusive for some time mostly because it's been difficult coordinating 
>the occurrence of the buzz with someone else available to play the note 
>while I check things out.  This finally happened yesterday.  All bolts 
>are tight.  When we play a Bb there is a buzz coming from somewhere 
>between the top and bottom center plates.  Laying only the weight of my 
>hand on the top plate makes it stop, remove my hand and it comes back.  
>It does not sound like any stray material is inside but it will not be 
>possible for me to remove the truck until summer sometime. What I did 
>was loosen the suspicious bolt about half way which allowed the plates 
>and arm to reposition slightly, then re tighten.  I have not been able 
>to make it recur since then.  It is a standard Colson truck from 
>Jensen's that I guess is about 15 years old.  I am inclined to recommend 
>just replacing the whole truck as I was expecting to replace the wheels 
>anyway this summer.  As anyone else experienced a similar problem with a 
>truck?  How long do you typically keep them on performance pianos?  Any 
>other suggestions.....?    It needs to be resolved with confidence. 

>thanks,

>Dennis Johnson
>St. Olaf College