[pianotech] Rep. Spring Strength

[Gerald Groot]

Raising or lowering the hammer line also affects repetition spring strength.


 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of reggaepass at aol.com
Sent: Friday, March 19, 2010 4:52 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Rep. Spring Strength

 

 

I assume from the replies so far that key leveling and dip would have
nothing to do with it?

But they do: More dip or less dip = higher or lower checking (all else being
equal).

Alan Eder

-----Original Message-----
From: Steven Hopp <hoppsmusic at hotmail.com>
To: pianotech at ptg.org
Sent: Fri, Mar 19, 2010 9:03 am
Subject: Re: [pianotech] Rep. Spring Strength

Yes, the checking height was changed but not by much.  I assume from the
replies so far that key leveling and dip would have nothing to do with it?
I can see how checking would make the difference due to greater or lesser
compression of the spring.
 
Regarding humidity.  I live in the desert and our RH where this piano sits
is 22-31% at all times.  
 
The pianist I worked for could tell after my tuning sat in the auditorium
overnight that the bass had gone sharp by about 2 cents but had no complaint
about what I considered to be slightly stronger than normal spring tension.
In fact he liked the way the piano played.
 
I guess I will weaken the springs a bit.  Sorry to say but I dislike
butterfly spring regulation.  I had a bad time with over strengthening those
springs and a bit of a struggle getting them back.  They still are not great
but at least it is on my personal piano so no client piano harmed =)
 
Thanks for the suggestions.
 
Steven Hopp
Midland, TX
 
P.S.  For any new techs who are reading this and might take the class "Are
You Regulationally Challenged?" at convention; which I highly recommend,
when Rick says that regarding rep spring strength their should be "some"
rise, any rise no matter how small is sufficient to start the regulation.
On the above piano I went willy nilly strengthening springs just so I
thought there was good rise to hammers....uh that was bad!!!  What a
learning lesson.  As I said it was my piano so no real harm done.   This
year I plan to take part two and really learn something....LOL.  
 

  _____  

To: pianotech at ptg.org
Date: Fri, 19 Mar 2010 01:01:38 -0400
From: tnrwim at aol.com
Subject: Re: [pianotech] Rep. Spring Strength

As Gene suggested, changing the checking height will make a difference on
how much tension there is on the rep spring. But the weather also has a lot
to do with it. When it's humid, the centers are tighter than in the dry
winter months. 

Wim

-----Original Message-----
From: Steven Hopp <hoppsmusic at hotmail.com>
To: pianotech at ptg.org
Sent: Thu, Mar 18, 2010 6:27 pm
Subject: [pianotech] Rep. Spring Strength

 
The question is:  Can a repetition spring get stronger from regulation
without adjusting the tension?
 
I did full regulation on Yamaha C7.  It was "regulated" by another
technician 6 months before me.  I found that key leveling and dip had not
been done so no telling where it went from there.  The level and dip was off
for sure.  As the regulation proceeded and came to it's conclusion I found
repetition spring strength better than when I started.  In fact it is too
strong in most sections.  How is this possible?
 
Thanks,
 
Steven Hopp
Midland, TX

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