2017 was our 20th year online!

Welcome to the Piano World Piano Forums
Over 3 million posts about pianos, digital pianos, and all types of keyboard instruments.
Over 100,000 members from around the world.
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

Shop our online store for music lovers
SEARCH
Piano Forums & Piano World
(ad)
Best of Piano Buyer
 Best of Piano Buyer
(ad)
Faust Harrison Pianos
Faust Harrison 100+ Steinway pianos
(ad)
Wessell Nickel & Gross
PianoForAll
Who's Online Now
96 members (AlphaTerminus, bounced, A. Lucato, brdwyguy, Asmaa, brennbaer, APianistHasNoName, 23 invisible), 1,476 guests, and 737 robots.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Previous Thread
Next Thread
Print Thread
Hop To
Page 1 of 2 1 2
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
Using a bit of a cheap sponge as back rail cloth instead of felt eliminates the bounce in my keys. Is sponge ever used? What legit material would do the same? I know I'm trying everone's patience here but folks, with your help I'm nearing a resolution smile

(ad)
Piano & Music Accessories
piano accessories music gifts tuning and moving equipment
Joined: Jan 2004
Posts: 2,273
2000 Post Club Member
Offline
2000 Post Club Member
Joined: Jan 2004
Posts: 2,273
I've tuned a few newer Kawai uprights that have a layer of some kind of sponge/foam on the hammer rest rail... Not sure if you can find something similar. It works really well.

Ron Koval

Joined: Jan 2006
Posts: 2,981
D
2000 Post Club Member
Offline
2000 Post Club Member
D
Joined: Jan 2006
Posts: 2,981
You would need to be sure that it does not degrade and become powdery with time...

Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
Thanks. That Kawai stuff sounds the ticket.

Joined: Jun 2010
Posts: 150
F
Full Member
Offline
Full Member
F
Joined: Jun 2010
Posts: 150
I restored a harpsichord that had been built with foam rubber rail padding, key punchings, and so forth. Everything had disintegrated. I second David-G's advice.


Floyd G RPT
www.floydgadd.com
Joined: May 2011
Posts: 379
B
Full Member
Offline
Full Member
B
Joined: May 2011
Posts: 379
Yamaha uses a foam rest rail on their upright players because the bouncing interferes with the playing system.


Professional Piano Technician serving the Tampa bay area. website: mckaigpianoservice.com
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
Wow! Just what I need. Any manufacturer's names? Thanks

Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
Just ordered some random foam from eBay. Time to experiment!

Joined: May 2012
Posts: 237
A
Full Member
Offline
Full Member
A
Joined: May 2012
Posts: 237
Originally Posted by chopin_r_us
Just ordered some random foam from eBay. Time to experiment!

What sort of foam have you ordered? Could you share a link? Thanks smile


Started work at the Bl├╝thner piano re-building workshop in Perivale, UK, in 1989. Self employed since 2000. Learning something new about pianos every day... smile

http://www.hamiltonpianos.com/
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
https://www.ebay.co.uk/itm/232600860764?var=532010422080

Just a soft 42X42X1/2" I didn't look too long. I'll see if I can find something 1/4" and maybe soft and medium to try as well.

I've contacted the guy. Meanwhile here's 1/4"

https://www.ebay.co.uk/itm/123311052334?hash=item1cb5e9562e:g:C4wAAOSw0d1cETHD

Joined: Apr 2015
Posts: 313
A
Full Member
Offline
Full Member
A
Joined: Apr 2015
Posts: 313
You are aware that if you put something of different thicknes there, your key height and whole action regulation will be off? If you put something thicker key height will go down, key dip will be reduced, damper - key timing will change and if you have single repetition action as you are claiming you have, there will be no lost motion and hammers will rest on jacks, so it will not work

Last edited by ambrozy; 05/14/21 02:53 PM.
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
That"s why I need a variety of thicknesses and densities. I'll start experimenting with a few keys in the bass.

Joined: Feb 2018
Posts: 1,485
G
1000 Post Club Member
Offline
1000 Post Club Member
G
Joined: Feb 2018
Posts: 1,485
Originally Posted by chopin_r_us
Just ordered some random foam from eBay. Time to experiment!

I have no idea if it has the right sonic/mechanical qualities but for a high quality foam unlikely to turn to dust I recommend something like 'Plastazote'. This is a resilient pressure (nitrogen) blown sealed cell structural foam I used for making custom fittings on white water open canoes. It is also used in healthcare for supports and artificial limbs etc. as it's stable and durable.

Last edited by gwing; 05/16/21 11:36 AM.
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
Thanks. I've ordered some from ebay. I see they're used for sole inlays. I never thought of trying those!

Joined: Jun 2004
Posts: 964
500 Post Club Member
Offline
500 Post Club Member
Joined: Jun 2004
Posts: 964
Originally Posted by chopin_r_us
Thanks. I've ordered some from ebay. I see they're used for sole inlays. I never thought of trying those!
Perhaps using plastazote as an under-layer beneath felt would get you the resilience you want and minimize the sound of the shanks coming to rest? At $40 for a sheet, pz is hardly "cheap foam", but if it does the job you need...


Andrew Kraus, Pianist
Educated Amateur Tuner/Technician
I Make Music that Lifts People Up & Brings Them Together
Rockville, MD USA
www.AndrewKraus.com
www.YouTube.com/RockvillePianoGuy
Twitter at @IAmAPianist

1929 Steinert 6'10" (Close copy of New York S&S "B")
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
I'love report back once it's arrived. I'm only going to test it on one key/hammer. That'll be enough. Meanwhile I think I've spotted my original problem - I have no back rail! Only a balance pin rail- at the back nada!

Joined: May 2007
Posts: 1,833
M
1000 Post Club Member
Offline
1000 Post Club Member
M
Joined: May 2007
Posts: 1,833
When I bought the foam for my bench the sales person explained that the quality of foam, including it's life expectancy, is determined by its density. So she sold me the heaviest foam they had for couch cushions. I found this article that is consistent with what she said. It may help you find a foam that will have the longest possible life.


Yamaha P90, Kawai GL-10
Joined: Feb 2018
Posts: 1,485
G
1000 Post Club Member
Offline
1000 Post Club Member
G
Joined: Feb 2018
Posts: 1,485
Originally Posted by MarkL
When I bought the foam for my bench the sales person explained that the quality of foam, including it's life expectancy, is determined by its density. So she sold me the heaviest foam they had for couch cushions. I found this article that is consistent with what she said. It may help you find a foam that will have the longest possible life.

That may be true for seat cushions but it isn't appropriate for everything and it takes no account of the higher quality materials available. For instance if you get a decent quality pressure blown foam camping mat (such as the yellow Karrimat ones) and make a cushion from several layers of that it would (probably) last many times longer before deforming than standard cheap chemically formed cushion foam.

Joined: Jun 2003
Posts: 29,809
B
BDB Offline
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
B
Joined: Jun 2003
Posts: 29,809
I doubt any foam will last as long as wool felted cloth.


Semipro Tech
Joined: Sep 2010
Posts: 2,648
C
2000 Post Club Member
OP Offline
2000 Post Club Member
C
Joined: Sep 2010
Posts: 2,648
I'm more interested in its damping properties. As it's my own instrument it can degrade all it likes.

Page 1 of 2 1 2

Moderated by  Piano World 

Link Copied to Clipboard
(ad)
Pianoteq
Steinway Spiro Layering
(ad)
PianoDisc

PianoDisc
(ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
(ad)
Mason & Hamlin Pianos
New Topics - Multiple Forums
Vibration in new piano
by Fantine56 - 07/30/21 03:20 PM
Hardman Peck console question
by eebird - 07/30/21 02:25 PM
Auction of rare piano collection
by Sweelinck - 07/30/21 01:04 PM
Please Help Me Find This Sheet
by Shinobi - 07/30/21 12:14 PM
Download Sheet Music
Virtual Sheet Music - Classical Sheet Music Downloads
Forum Statistics
Forums42
Topics208,294
Posts3,117,726
Members102,284
Most Online15,252
Mar 21st, 2010
Please Support Our Advertisers

Faust Harrison 100+ Steinways

Dampp Chaser Piano Life Saver

 Best of Piano Buyer

PianoTeq Bechstein
Visit our online store for gifts for music lovers

Virtual Sheet Music - Classical Sheet Music Downloads



 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
| Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | MapleStreetMusicShop.com - Our store in Cornish Maine


© copyright 1997 - 2021 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission
Powered by UBB.threads™ PHP Forum Software 7.7.5