Mystery grand damper dilemma

[jolly roger]

Hi Terry,
             Humidity changes can make the span of the guide rail flex as
much as 1mm causing the wire to bind in the guides.
A modification is in the works to make it a solid back support.   The
humidity movement also seems to cause the screws to loosen.  I have often
fixed the problem by loosening the rail screws and shifting the rail a
little.  But the fix is temporary.
Roger 




At 04:28 PM 6/15/01 -0700, you wrote:
>Roger,
>
>First, you have to guess the actual cause, which so far nobody has.
>
>My easy fix is just that, and indeed permanant.
>
>Terry
>\
>>The guide rail moves, possibly your easy fix will not last.   Permanant
>>solution on request.  <G>
>>
>>Roger
>>
>>
>>At 01:21 PM 6/15/01 -0700, you wrote:
>> >Still not the right answer. Hint: It's a simple fix, but the problem is
>> >caused by something "outside" of the action and keybed, although it DOES
>> >affect it, causing the problem.
>> >
>> >Terry
>> >
>> >>From: "Joe & Penny Goss" <imatunr@srvinet.com>
>> >>Reply-To: pianotech@ptg.org
>> >>To: <pianotech@ptg.org>
>> >>Subject: Re: Mystery grand damper dilemma
>> >>Date: Fri, 15 Jun 2001 12:04:39 -0600
>> >>
>> >>Sos tabs in wrong place due to return spring being out of place?
>> >>Joe Goss
>> >>imatunr@srvinet.com
>> >>www.mothergoosetools.com
>> >>----- Original Message -----
>> >>From: "pianolover 88" <pianolover88@hotmail.com>
>> >>To: <pianotech@ptg.org>
>> >>Sent: Friday, June 15, 2001 11:03 AM
>> >>Subject: Mystery grand damper dilemma
>> >>
>> >>
>> >> > hi List,
>> >> >
>> >> > Here's a good one: While testing a new Kohler & Campbell SKG 500 
>>Grand,
>> >>I
>> >> > noticed that the dampers from the mid section up were very sluggish, 
>>and
>> >> > while they would damp the strings, it took much to long for them to 
>>come
>> >> > back down to rest on the strings, almost as if in slow motion.
>> >> > So i tested another identical Kohler grand...SAME PROBLEM! But this 
>>time
>> >>it
>> >> > was mostly in the bass section. I did discover the problem, and the
>> >>remedy
>> >> > was pretty simple. Any guesses as to what was the culprit?
>> >> >
>> >> > Terry Peterson
>> >> > Precision Piano Service
>> >> > Torrance, CA
>> >> >
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>
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