[pianotech] Raising rates in recession

[David Love]

Probably not quite that much since the total movement of the pitch to the
flat side in this case comes from tuning the strings on both sides of the
note.  So if you are tuning up from the bottom and get to C4, for example,
it will have dropped maybe half of that amount, say 115 cents, which means
that even at 30% overpull you only need to overpull by 34.5 cents.  While it
may be more in the treble keep in mind that pulling C6 on a Steinway B (for
example) one full semi tone sharp (100 cents) raises the break point only
from 60% to 67%.  Still quite manageable and much more than you are likely
to need.  Breakage on pitch raises, in my view, doesn't come from exceeding
break point percentages overall, it comes from friction issues through the
bearing points and that can happen even without a significant overpull.  

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Terry Farrell
Sent: Friday, July 02, 2010 9:40 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Raising rates in recession

Yes. All I was pointing out is that if every string on a piano is one  
semitone flat before doing anything, when you start raising pitch from  
A0, the increased tension added to each string as you go along will  
cause the treble-more strings to fall in pitch. So that once you get  
to the upper tenor for example, the strings will be approximately 125  
to 139 cents flat - and the treble a bit more than that -  but that's  
okay, because the ETD will calculate require overpull based on the  
string pitch after it has been influenced by earlier strings.

Terry Farrell

On Jul 3, 2010, at 12:33 AM, Ron Nossaman wrote:

> Terry Farrell wrote:
>> Correct on the overpull. But I find that medium and larger sized  
>> pianos require somewhere in the range of 38% overpull. This guy  
>> said the piano was a semitone flat. When you pull up the pitch  
>> starting from A0, that will cause the strings toward the treble to  
>> drop in pitch. As the pitch raise proceeds through the tenor to the  
>> treble, I would expect that the next note in the treble would be  
>> 130, 140 or so cents flat, and requiring something approximating a  
>> 50 or 60 cent overpull. Every piano is different, of course.
>
> I'm told over and over that ETDs calculate this stuff automatically,  
> so the poor backward aural tuner doesn't have to guess on pitch  
> raises. Accurate one pass pitch raises is one of the primary  
> leverage points for ETD use, isn't it?
>
> Ron N