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#2086268 - 05/21/13 01:51 PM Upright hammer felt too soft?  
Joined: Apr 2013
Posts: 8
thepianoman2020 Offline
Junior Member
thepianoman2020  Offline
Junior Member

Joined: Apr 2013
Posts: 8
VA
Hello hello,

I made an attempt to sand the hammers on my studio upright for the first time and did a pretty OK job. However, I've noticed that only after light playing, there are grooves forming again. Is it normal for grooves to form quickly (within a couple of weeks) or is this an indication that the hammers are old? I don't think that the hammers have been replaced and the piano is over 50 years old.

Thanks for anybody's advice.


Nate Ellis
Aspiring piano technician
Singer-songwriter
"The only thing that I try to do when I compose is to make it [the music] say simply and directly that which is in my heart."
-Sergei Rachmaninoff
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#2086279 - 05/21/13 02:02 PM Re: Upright hammer felt too soft? [Re: thepianoman2020]  
Joined: Jan 2010
Posts: 3,087
Mark Cerisano Offline
3000 Post Club Member
Mark Cerisano  Offline
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Joined: Jan 2010
Posts: 3,087
Montreal, Quebec, Canada
You didn't file enough felt off. The felt fuzz just filled the grooves and flattened out after playing a bit.


Mark Cerisano, RPT, B.Sc.(Mech.Eng), Dip.Ed.(Music)
www.howtotunepianos.com
#2086282 - 05/21/13 02:11 PM Re: Upright hammer felt too soft? [Re: Mark Cerisano]  
Joined: Apr 2013
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thepianoman2020 Offline
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thepianoman2020  Offline
Junior Member

Joined: Apr 2013
Posts: 8
VA
That makes sense to me! Didn't think about that. Thanks!


Nate Ellis
Aspiring piano technician
Singer-songwriter
"The only thing that I try to do when I compose is to make it [the music] say simply and directly that which is in my heart."
-Sergei Rachmaninoff
#2086486 - 05/21/13 10:33 PM Re: Upright hammer felt too soft? [Re: thepianoman2020]  
Joined: Dec 2012
Posts: 4,238
Ed McMorrow, RPT Offline
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Ed McMorrow, RPT  Offline
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Joined: Dec 2012
Posts: 4,238
Seattle, WA USA
You should see string marks in the hammer surface soon after the hammers have been played 20-30 times. If you finish shaping the hammer with 220 it will shorten all the fibers that are sticking up. You don't want to leave the surface too rough.

You do not need to shape a used hammer to the point where you see no string mark at all. The bass hammers should have a definite mark remain because the strings are so large and as you move up to the small diameter strings the remaining marks should get small enough that the side of the string is unencumbered by the hammer felt.


In a seemingly infinite universe-infinite human creativity is-seemingly possible.
According to NASA, 93% of the earth like planets possible in the known universe have yet to be formed.
Contact: Ed@LightHammerpiano.com
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#2086793 - 05/22/13 12:50 PM Re: Upright hammer felt too soft? [Re: Ed McMorrow, RPT]  
Joined: Mar 2009
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rXd Offline
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rXd  Offline
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Joined: Mar 2009
Posts: 2,434
Originally Posted by Ed McMorrow, RPT
You should see string marks in the hammer surface soon after the hammers have been played 20-30 times. If you finish shaping the hammer with 220 it will shorten all the fibers that are sticking up. You don't want to leave the surface too rough.

You do not need to shape a used hammer to the point where you see no string mark at all. The bass hammers should have a definite mark remain because the strings are so large and as you move up to the small diameter strings the remaining marks should get small enough that the side of the string is unencumbered by the hammer felt.


+1.
You also know that you haven't removed too much of your, or your clients' valuable felt.
No less than A. J. Hipkins said that a controlled small amount of groove improves the tone.


Amanda Reckonwith
Concert & Recording tuner-tech, London, England.
"in theory, practice and theory are the same thing. In practice, they're not." - Lawrence P. 'Yogi' Berra.



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