[CAUT] buzzing truck

[Elwood Doss]

Hi Dale,
Got a photo of the vertical brace?  I'd like to see what you've done.
Joy!
Elwood

Elwood Doss, Jr., M.M.E., RPT
Piano Technician/Technical Director
Department of Music
145 Fine Arts Building
The University of Tennessee at Martin
Martin, TN  38238
731/881-1852
FAX: 731/881-7415
HOME: 731/587-5700

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
Ward & Probst, Inc
Sent: Thursday, May 15, 2008 3:18 PM
To: 'College and University Technicians'
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