split bridge

[jolly roger]

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Hi Dave,
             I have clamped more than a few Baldwin laminated bridges with
West
systems epoxy with no re occurance of failures.
Use the water thin type, it wicks very nicely.
Roger


At 07:51 PM 8/31/01 -0700, you wrote: 
>
> Joe:
>  
> Why would you not clamp epoxy?  The bridge needs to be pulled back together,
> among other reasons, to get the pins back in the right position.  My
> conversation this date with Roger Weisensteiner confirmed my belief that
this
> would be the method of choice for making this repair.  He suggested using a
> two part epoxy (e.g. West System type) and clamp it back together
reinserting
> the pins either before or after it dried.  My concern with after is that
if I
> have to redrill the case might be in the way.  So I will probably reinsert
> the pins before it dries.
>  
> Regarding solvents and epoxy, I have, in the past, repinned bridges
putting a
> drop or two of epoxy in the bottom of the bridge pin hole prior to inserting
> the pin.  The squeeze out I have cleaned up by brushing it onto the notch
> using an acid brush with a bit of lacquer thinner.   I think I may have been
> introduced to this technique by Bill Spurlock in a Journal article in fact. 
> Though I recognize the controversy surrounding epoxying bridge pins in, I
> wasn't aware that a bit of lacquer thinner was compromising the strength of
> the epoxy.  
>  
> David Love
>>
>> ----- Original Message -----  
>> From: <mailto:joegarrett@earthlink.net>Joseph Garrett  
>> To: <mailto:pianotech@ptg.org>pianotech@ptg.org  
>> Sent: August 31, 2001 5:47 PM 
>> Subject: Re: split bridge
>>
>> David, 
>> It is not adviseable to "clamp" epoxy. Use a gap filling type and just let
>> it set to almost, then clean up by scraping, etc. Also not adviseable to
use
>> the compatible solvent, of which there are two, (there may be more),
Alcohol
>> and lacquer thinner are verboten, it will simply break down the strenght of
>> the epoxy. I personally use "steel epoxy" for this kind of repair. 
>> regards, 
>> Joe Garrett 
>> ----- Original Message -----  
>> From: <mailto:davidlovepianos@earthlink.net>David Love  
>> To: <mailto:pianotech@ptg.org>Pianotech  
>> Sent: Friday, August 31, 2001 10:07 AM 
>> Subject: split bridge
>>
>> I have a customer with a Boesendorfer 225 c 1978.  The bridge is splitting
>> along the speaking side pin line on the top 5-6 notes.  I'm not sure how
>> long it has been this way, this is the first time I've seen the piano.  My
>> intention is to remove strings from this area, work epoxy into the crack,
>> pull it all back together with clamps and clean off the excess with a
bit of
>> lacquer thinner.  Any comments. 
>>   
>> David Love
>







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