[CAUT] backchecks and capsizing, (was Glenn Gould/BachStuff

[central]

David,
    If I understood Ed correctly, "Capsizing" refers to a condition where a
hammer gets caught by the backcheck below the hammer line during fast
staccato repetition with the jack impaled helplessly against the front side
of the knuckle.   Too much distance between shanks and rest felts allows
this.  
   Deeper causes include just about every aspect of parts, regulation, and
geometry.  Recall also those articles by CAUT forefather Ken Sloan on
repetition failure and hammer tail length etc.
     I'd sure never tell a customer whose piano suffers those maladies they
have "Catastrophic Action Failure" if that's the official PTG term.
"Occasionally Capsizing hammers" seems a little less severe.
-Mike


On 2/27/06 5:56 PM, "David Ilvedson" <ilvey@sbcglobal.net> wrote:

> Well....explain the capsizing bit again...?
> 
> David Ilvedson, RPT
> Pacifica, California
> 
> 
> 
> ----- Original message ----------------------------------------
> From: ed440@mindspring.com
> To: CAUT <caut@ptg.org>
> Received: 2/27/2006 9:09:43 AM
> Subject: Fw: RE: [CAUT] backchecks and capsizing, (was Glenn Gould/BachStuff
> 
> 
>> Pardon, I meant to send this to Eric privately.
>> But if anyone wants to add to it......?
>> Ed
> 
>> -----Forwarded Message-----
>>> From: ed440@mindspring.com
>>> Sent: Feb 27, 2006 5:06 PM
>>> To: College and University Technicians <caut@ptg.org>
>>> Subject: RE: [CAUT] backchecks and capsizing, (was Glenn Gould/Bach Stuff
>>> 
>>> Eric-
>>> Would you care to expand on this just a little bit?
>>> I'm thinking it could make a good item in the Tips, Tools and Techniques
>>> column of 
>> the Journal.
>>> Ed Sutton
>>> Assistant Editor
>>> PTJournal
>>> 
>>> -----Original Message-----
>>>> From: "Wolfley, Eric (wolfleel)" <WOLFLEEL@UCMAIL.UC.EDU>
>>>> Sent: Feb 27, 2006 3:57 PM
>>>> To: College and University Technicians <caut@ptg.org>
>>>> Subject: RE: [CAUT] backchecks and capsizing, (was Glenn Gould/Bach Stuff
>>>> 
>>>> "catastrophic action failure".
>>>> 
>>>> I have a test for this that I call the "absolute test for minimum action
>>>> function" i.e. - will the note work?
>>>> 
>>>> Play a note at a normal blow and after it checks, lower it to rest
>>>> position very slowly. Then give the note a sharp blow. This will uncover
>>>> a myriad of little problems which can result in non-functionality.
>>>> 
>>>> Eric Wolfley, RPT
>>>> Head Piano Technician
>>>> Cincinnati College-Conservatory of Music
>>>> University of Cincinnati
>>>> 
>>>> -----Original Message-----
>>>> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
>>>> A440A@aol.com
>>>> Sent: Monday, February 27, 2006 3:46 PM
>>>> To: caut@ptg.org
>>>> Subject: [CAUT] backchecks and capsizing, (was Glenn Gould/Bach Stuff
>>>> 
>>>> 
>>>> In a message dated 2/27/06 2:43:49 PM, jorge1ml@mail.cmich.edu writes:
>>>> 
>>>> << "Action Capsizing"?  Did you invent that term?  That's a really neat
>>>> term to describe hammers caught below the hammer line! >>
>>>> 
>>>> Yea,  I learned that knots will capsize if tied incorrectly or used
>>>> incorrectly, just seemed to fit the action condiition formerly referred
>>>> to as 
>>>> "catastropic action failure".
>>>> Regards, 
>>>> 
>>>> 
>>>> 
>>>> Ed Foote RPT 
>>>> http://www.uk-piano.org/edfoote/index.html
>>>> www.uk-piano.org/edfoote/well_tempered_piano.html
>>>> 
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