[pianotech] broken agraffes

[John Ross]

Dean, you say a design feature.
I say a design failure. :-)
John Ross
Windsor, Nova Scotia
On 23-01-2012, at 1:49 PM, Dean May wrote:

> It's a design feature...
> 
> Dean
> 
> Dean W May (812) 235-5272 voice and text
> 
> PianoRebuilders.com (888) DEAN-MAY
> 
> Terre Haute IN 47802
> 
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
> Of Ron Nossaman
> Sent: Monday, January 23, 2012 12:44 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] broken agraffes
> 
> On 1/23/2012 10:40 AM, Wally Scherer wrote:
> 
>> It seems that Steinways are notable for this problem. (WHY?)
> 
> The agraffes that break have a flat bottomed shoulder and the stud isn't 
> threaded all the way up to the shoulder. When these were installed, the 
> stud ran out of thread before the shoulder seated, so they just cranked 
> them on down in spite of it. This over stressed the stud. When they did 
> bottom out, the flat bottomed shoulder wasn't crushable like the concave 
> shoulders in the supply house agraffes we get now. So when they cranked 
> them even harder to align them it stressed the stud even more.
> 
> When they eventually break, the stud threads are still jammed into the 
> plate threads, making the broken stud hard to get out.
> 
> That's pretty much it.
> Ron N
> 

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