[pianotech] Chickering Grand Hammer Flanges?

[Joseph Garrett]

I just forwarded this to John Rhodes. He probably knows. (At least I hope so.<G>) I'm suspecting that raising the temp. to the proper annealing range for brass would weaken the screws made of steel. And, for that matter some drop screws are made of brass and need to be hard. Is a puzzlement.
Joe


----- Original Message ----- 
From: Mike Spalding 
To: joegarrett at earthlink.net;pianotech at ptg.org
Sent: 7/26/2011 7:33:28 AM 
Subject: Re: [pianotech] Chickering Grand Hammer Flanges?


Joe,

If you decide to go ahead with the annealing, I would strongly recommend removing the screws first.  Steel and brass react very differently to heat treating.  Whatever works for brass will do something different, and probably unwanted, to the steel screws.  Sorry I don't have enough knowledge/experience to predict exactly what.. hence my caution.

Mike 

On 7/26/2011 9:00 AM, Joseph Garrett wrote: 
Tom,
I guess that was part of my question, as well.<G> I'd like to retain the flanges, if possible, but there are issues. Still waiting for some of those eye opening answers.<G>
Joe


----- Original Message ----- 
From: Tom Driscoll 
To: joegarrett at earthlink.net
Sent: 7/26/2011 6:16:10 AM 
Subject: Re: [pianotech] Chickering Grand Hammer Flanges?


Joe,
   I don't know the answer, but I do have a related question about  frozen  drop screws on these flanges. I've had numerous experiences  where they just break off .
  So my somewhat related query is will heat break them loose ?
   Awaiting our crews response to both questions,
 Best,
 Tom Driscoll 



On 07/26/11, Joseph Garrett<joegarrett at earthlink.net> wrote: 
Anyone have an idea the difference of expansion rates of Steel and Brass.
I'm into a Chickering Grand and am planning on trying to anneal them
puppies. Reason for asking is wether to remove the screws and drop screws
or leave them in during the annealing process. Any one have some thoughts?
Regards,
Joe


Joe Garrett, R.P.T.
Captain of the Tool Police
Squares R I
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