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
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)
Wessell Nickel & Gross
PianoForAll
(ad)
Best of Piano Buyer
 Best of Piano Buyer
(ad)
Faust Harrison Pianos
Faust Harrison 100+ Steinway pianos
Who's Online Now
23 members (Gianluca, JackQ89, Ewanhouse, Johnny English, Keith D Kerman, djvu10, Kawai James, kpembrook, 6 invisible), 333 guests, and 423 robots.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Previous Thread
Next Thread
Print Thread
Hop To
Diagnosing noisy una corda pedal
#3013912 08/14/20 05:53 PM
Joined: Oct 2019
Posts: 6
K
Kernzy Offline OP
Junior Member
OP Offline
Junior Member
K
Joined: Oct 2019
Posts: 6
Piano in question is a 1961 Steinway B. The soft pedal on the piano makes a fairly loud creaking/groaning sound as the pressure on the pedal is relieved. It is really audible as the pedal is disengaged as opposed to when first depressed. I have tried dry lubricant on the the key frame/bed with minimal improvement. If I turn the glide bolts down any further, the key tops rub on the bottom of the fallboard and have already begun to scrape the felt away. With the action removed, the pedal seems to operate fine (no noise). Just a guess but it seems to me the keyframe is flexing or rubbing as it slides back into home position. Since i've owned the piano, the soft pedal has always been a lot stiffer than I would like ideally. I'm an amateur tech/tuner and kind of at a loss on how I should proceed.

(ad)
Piano & Music Accessories
piano accessories music gifts tuning and moving equipment
Re: Diagnosing noisy una corda pedal
Kernzy #3013923 08/14/20 06:16 PM
Joined: Jun 2003
Posts: 28,908
B
BDB Offline
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
B
Joined: Jun 2003
Posts: 28,908
First of all, raise the glide bolts. I do not understand how you could think that lowering them would help. The classic way of adjusting them is to remove all the keys, put the keyframe in place, and put a piece of newspaper under the glide bolts, and raise them until you can move the paper under them. The weight of the keys will add just enough weight so the keyframe will be barely supported by the glide bolts, which minimizes the friction and wear.

Then check all the screws holding the action return spring in place are tight. Lubricating the ends of the spring that touch the keyframe is most likely to reduce noise when the action returns. But the heavy action hitting the block on the opposite end will alway cause a thump if you do not release the pedal gently.

Check the guide plates in the cheek blocks have no rough edges. If the noise goes away when the cheek blocks are in place but not screwed in, that is likely to be the problem.

The action is heavy, and the spring has to be heavy to push it back. There is no easy way to make the una corda lighter, and the forces necessary for it to work make it impossible to diagnose anything when the action is removed.

Make sure the lyre, the braces, and everything in it is in its proper position and that no joints are loose. The pedals should not wiggle side to side.


Semipro Tech
Re: Diagnosing noisy una corda pedal
Kernzy #3014011 08/14/20 11:26 PM
Joined: May 2003
Posts: 2,066
E
2000 Post Club Member
Offline
2000 Post Club Member
E
Joined: May 2003
Posts: 2,066
Make sure the una corda lever is not raising the keyframe. It is a not uncommon problem on this brand that the mortise for it is too low. You can check it by taking the stack off and seeing if the back rail lifts as you press the pedal.
Regards,

Re: Diagnosing noisy una corda pedal
Kernzy #3014019 08/15/20 12:18 AM
Joined: Sep 2004
Posts: 2,531
G
2000 Post Club Member
Offline
2000 Post Club Member
G
Joined: Sep 2004
Posts: 2,531
Sometimes the return spring can etch into the action frame and cause noise. Be sure the spring and wood surfaces are smooth and clean.


RPT
PTG Member
Re: Diagnosing noisy una corda pedal
Kernzy #3014126 08/15/20 07:17 AM
Joined: Jan 2007
Posts: 231
N
Full Member
Offline
Full Member
N
Joined: Jan 2007
Posts: 231
Originally Posted by Kernzy
If I turn the glide bolts down any further, the key tops rub on the bottom of the fallboard and have already begun to scrape the felt away.

BDB, Ed and Gene have already given you some great advice, but the above statement stood out for me, and I'd want to back up and address the keybedding first off as it sounds as if this may have been dramatically altered. I strongly recommend the "Worldwide Technical Reference Guide" available from Steinway in NY, which lays out exactly how this can be done very quickly, without the need to remove any keys (yes BDB, I learned that way too!). Among a great many other things, the Guide also completely demystifies NY Steinway sostenuto adjustment, for which reason alone it belongs in every tech's library!

After that, a piano that old would really benefit from a complete overhaul of the pedal box and trapwork assembly with new leather/felt and parts. Check the lyre post joints carefully and disassemble and reglue as necessary. Check that the trap lever mounting screws are tight and the trap pivot pins inspected and lightly lubricated (I use a dab of Superlube synthetic grease from Pianotek Supply for this). Although you already tried dry lube on the keybed, you might again consider backing up and lightly sanding the keybed to remove any irregularities and previously applied lubricants, and then reapply a light teflon spray. I've seen waxes used which can cause the keyframe to chatter as it slides.

Good luck!


Mark Dierauf, RPT
NH Pianos
Piano technician & rebuilder since 1978
www.nhpianos.com
Re: Diagnosing noisy una corda pedal
Kernzy #3014171 08/15/20 10:30 AM
Joined: Jun 2003
Posts: 28,908
B
BDB Offline
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
B
Joined: Jun 2003
Posts: 28,908
I know that there are other ways of setting the glide blocks, but the paper method is easy to understand and does not take much skill. Other methods might be better left for people who do it all the time, recognizing that there are all too many people who will hear about something that requires skill and practice, but think that they do not need either of those things to excel the first time.


Semipro Tech

Moderated by  Piano World 

Link Copied to Clipboard
(ad)
Pianoteq
PianoTeq Karsten Collection
(ad)
PianoDisc

PianoDisc
(ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
(ad)
Mason & Hamlin Pianos
What's Hot!!
News from the Piano World
Our October 2020 Free Piano Newsletter is Here!
---------------------
3,000,000+!
------------------
Posting Pictures on the Forums
-------------------
Forums RULES & HELP
-------------------
ADVERTISE on Piano World
New Topics - Multiple Forums
Good 1 year piece to shoot for?
by Javaslinger - 10/27/20 09:10 PM
The Bluthner Concert and Exhibition Hall 1887
by David-G - 10/27/20 07:38 PM
The example video clip of short resonance
by tony3304 - 10/27/20 07:37 PM
MIDIator App -Now available for Laptops/PC/Macs
by itai.street - 10/27/20 05:12 PM
What was the name of the piano retailer...
by Pianolance - 10/27/20 04:36 PM
Download Sheet Music
Virtual Sheet Music - Classical Sheet Music Downloads
Forum Statistics
Forums41
Topics202,445
Posts3,017,840
Members99,050
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 |


copyright 1997 - 2020 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission
Powered by UBB.threads™ PHP Forum Software 7.7.4