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

Registered: 04/09/13
Posts: 8
Loc: 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]
Mark Cerisano, RPT Offline
2000 Post Club Member

Registered: 01/24/10
Posts: 2324
Loc: 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
www.howtotunepianos.com

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#2086282 - 05/21/13 02:11 PM Re: Upright hammer felt too soft? [Re: Mark Cerisano, RPT]
thepianoman2020 Offline
Junior Member

Registered: 04/09/13
Posts: 8
Loc: 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

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#2086486 - 05/21/13 10:33 PM Re: Upright hammer felt too soft? [Re: thepianoman2020]
Ed McMorrow, RPT Offline
3000 Post Club Member

Registered: 12/09/12
Posts: 3338
Loc: 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.
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]
rXd Offline
2000 Post Club Member

Registered: 03/11/09
Posts: 2302
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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