I think I saw something from Schimmel about using a transducer on the board and possibly sand...maybe 20 years ago, now....I don't
remember the details, now.
There are quite a few videos on Chladni frequency patterns on Youtube. It's not just about soundboard resonances....if anyone cares to
spend the time. It's very interesting.
There was another discussion on Stradivarius Violins I ran across that had interesting information on how they determined Antonio thinned
the upper plate in special places after glue up, to open up the sound. It was over and hour of discussion on various techniques and more
than one video. Very interesting. It would be nice if you could thin the board somehow after the piano is strung up, wouldn't it?
I ran across this soundboard thinning video....but it is not on topic....pretty nifty, though...
https://youtu.be/oabyiMUrGBQ------------------------------
Richard Adkins
Piano Technician
Coe College
Cedar Rapids, IA
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Original Message:
Sent: 12-15-2019 09:12
From: Peter Grey
Subject: The Soundboard Panel tells you where it needs thinning
Some European makers have been doing this for a long time. Chris is the first around here (that I have heard of) who is trying to incorporate it here on this side of the pond.
Naturally we are interested in the final result as well as further experimentation. (At least I am).
Pwg
------------------------------
Peter Grey
Stratham NH
603-686-2395
pianodoctor57@gmail.com
Original Message:
Sent: 12-14-2019 02:20
From: David Love
Subject: The Soundboard Panel tells you where it needs thinning
It all seems kind of fun and interesting but I can't imagine what use it is as a design practice. When the board is glued in, when the strings are in and pulled to pitch compressing the board, even with the plate installed, the modal frequencies of the soundboard will change. Where they end up depends as much on these factors as it does on the original design, material choice, and execution of the panel and rib set not to mention the ambient humidity and possibly temperature.
In practice, since the modal frequencies are dependent on all the collective inputs and since those factors vary and can't be included in an experimental mock-up, what are you hoping to gain other than amusement from this pursuit?
Honestly, I don't see any practical benefit.
------------------------------
David Love RPT
www.davidlovepianos.com
davidlovepianos@comcast.net
415 407 8320
Original Message:
Sent: 12-13-2019 02:09
From: Blaine Hebert
Subject: The Soundboard Panel tells you where it needs thinning
My question would be what does the Chladni pattern look like for a very good soundboard? What does it look like for a bad soundboard?
Does emulating the pattern of a great soundboard produce a better sounding piano as compared to just making a standard soundboard?
------------------------------
Blaine Hebert
Duarte CA
626-795-5170
Original Message:
Sent: 12-09-2019 12:21
From: Chris Chernobieff
Subject: The Soundboard Panel tells you where it needs thinning
Richard,
That would be Ernst Chladni. I have done 2 dozen plus Chladni tests on piano soundboards focusing on the fundamental frequency for now. All the boards exhibit the same behavior except Steinway the sand goes farther up into the treble sections. My thesis on that, is that its the root cause of the killer octave. Baldwin seemed to thinks so too, going by their rib scales which are pretty identical to SS except for two ribs in that upper section have more mass. If you go to my youtube channel watch these two Chladni videos back to back (MH AA and the SS O ).
Here's a link to one:
https://www.youtube.com/watch?v=aFbb1mzhx5E
-chris
------------------------------
If it's pinging, it's not singing, it's just ringing,
chernobieffpiano.com
grandpianoman@protonmail.com
Knoxville, TN
865-986-7720
Original Message:
Sent: 12-09-2019 11:32
From: Richard Adkins
Subject: The Soundboard Panel tells you where it needs thinning
" So i tried the chladni" What pray tell is chladni ?
------------------------------
Richard Adkins
Piano Technician
Coe College
Cedar Rapids, IA
Original Message:
Sent: 12-08-2019 23:29
From: Chris Chernobieff
Subject: The Soundboard Panel tells you where it needs thinning
I did it with each individual rib before glue up on a custom jig. Then used the set up in the pic to adjust the panel. Yes first test. I noticed a clear improvement on tap test, seemed to open up. So i tried the chladni, and the sand went to the ceiling.
-chris
------------------------------
If it's pinging, it's not singing, it's just ringing,
chernobieffpiano.com
grandpianoman@protonmail.com
Knoxville, TN
865-986-7720
Original Message:
Sent: 12-08-2019 23:14
From: Jim Ialeggio
Subject: The Soundboard Panel tells you where it needs thinning
Do you do this farther up the scale?
Have you done this on pianos before, or is this a beta test? sounds interesting.
------------------------------
Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
Original Message:
Sent: 12-08-2019 23:04
From: Chris Chernobieff
Subject: The Soundboard Panel tells you where it needs thinning
When the bridge rides on the crest of the wave, the board gets more energy. I put dials on opposite ends of a rib line. Put weight on a location that moves both dials the same. If that location is not the bridge, then the board needs to be adjusted until it is.
------------------------------
If it's pinging, it's not singing, it's just ringing,
chernobieffpiano.com
grandpianoman@protonmail.com
Knoxville, TN
865-986-7720
Original Message:
Sent: 12-08-2019 18:36
From: Jim Ialeggio
Subject: The Soundboard Panel tells you where it needs thinning
how do you read it?
------------------------------
Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
Original Message:
Sent: 12-08-2019 18:10
From: Chris Chernobieff
Subject: The Soundboard Panel tells you where it needs thinning
------------------------------
If it's pinging, it's not singing, it's just ringing,
chernobieffpiano.com
grandpianoman@protonmail.com
Knoxville, TN
865-986-7720
------------------------------