2017 was our 20th year online!

Welcome to the Piano World Piano Forums
Over 2.9 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)
Petrof Pianos
Petrof Pianos
(ad)
Pianoteq
PianoTeq Karsten Collection
(ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
Who's Online Now
39 members (almo82, Beowulf, CyberGene, aphexdisklavier, Calavera, dbudde, ChiaraTor, brianlovespiano, 10 invisible), 358 guests, and 435 robots.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Previous Thread
Next Thread
Print Thread
Hop To
Mason and Hamlin upright keys not returning all the way
#2875623 08/03/19 10:08 AM
Joined: Nov 2015
Posts: 1
W
Junior Member
OP Offline
Junior Member
W
Joined: Nov 2015
Posts: 1
Hello,

This is my first time posting in this forum so apologies if this has already been discussed somewhere else.

I am in the process of regulating a Mason and Hamlin D upright piano from 1920. When adjusting the lost motion, I notice that at the end of the key stroke, the back of the key doesn't fully return to to its rest position, making the lost motion just set now non-existent i.e. the jack is once again pressing right against the hammer butt. The possible causes I could see for this are:

too much friction between capstan and bottom of whippen
actual key weight off (maybe the wood has dried out the back of the key doesn't have sufficient weight to return?
some sort of geometry issue with height of balance rail vs back rail?

Any help would be greatly appreciated! I've seen this on old Steinway uprights as well where lost motion just can't accurately be set due to keys not returning fully. Wondering what I may be missing here. Thanks in advance for your help.

(ad)
Piano & Music Accessories
piano accessories music gifts tuning and moving equipment
Re: Mason and Hamlin upright keys not returning all the way
wintersorbeck #2875647 08/03/19 11:28 AM
Joined: Jun 2003
Posts: 28,670
B
BDB Offline
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
B
Joined: Jun 2003
Posts: 28,670
Keys may not all be weighted towards the back, so that some will rest against the back rail felt rather than the front rail punching. Check the lost motion by pulling on the hammer rest rail and seeing if the hammers move.


Semipro Tech
Re: Mason and Hamlin upright keys not returning all the way
wintersorbeck #2875658 08/03/19 12:08 PM
Joined: Apr 2010
Posts: 2,198
K
Platinum Subscriber
2000 Post Club Member
Offline
Platinum Subscriber
2000 Post Club Member
K
Joined: Apr 2010
Posts: 2,198
Not likely a weighting issue. Probably (at least in part) a lubrication issue.

First step in preparation to regulate is a complete lubrication of the action/keys. Did you do this?

Swollen or cavitated key bushings? (Balance are usually worst offenders)

And, welcome to the forum!


Keith Akins, RPT
Piano Technologist
USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair
editor emeritus of Piano Technicians Journal
Re: Mason and Hamlin upright keys not returning all the way
wintersorbeck #2880355 08/16/19 05:13 PM
Joined: May 2012
Posts: 499
G
Full Member
Offline
Full Member
G
Joined: May 2012
Posts: 499
If you were to remove the action - which is an easy lift for me at 83yrs - you will see if the keys are not free to fall back onto the back felt.
Have you not removed the action and keys to clean up generally - this is really necessary on an old piano ?

Re: Mason and Hamlin upright keys not returning all the way
wintersorbeck #2880357 08/16/19 05:15 PM
Joined: May 2012
Posts: 499
G
Full Member
Offline
Full Member
G
Joined: May 2012
Posts: 499
If you were to remove the action - which is an easy lift for me at 83yrs - you will see if the keys are not free to fall back onto the back felt.
Have you not removed the action and keys to clean up generally - this is really necessary on an old piano ?

Re: Mason and Hamlin upright keys not returning all the way
wintersorbeck #2880387 08/16/19 06:31 PM
Joined: Feb 2017
Posts: 3,101
P
3000 Post Club Member
Offline
3000 Post Club Member
P
Joined: Feb 2017
Posts: 3,101
If I am not mistaken, I think that model has auxiliary jack return springs (a little brass leaf spring about 1/2 - 2/3 way up the jack arm). I believe that the design was for it to bear against the inside of the backstop and help push the jack back into place. If this piano is so equipped, they are probably weak and/or breaking. If they're not there than it is a non-issue.

If though they are there, and the action design intended to rely on this spring to get the jack back, and allow greater front weighting of the keys, that might have something to do with it.

Do you have these springs?

Pwg

Last edited by P W Grey; 08/16/19 06:32 PM.

Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8

Moderated by  Piano World 

Link Copied to Clipboard
What's Hot!!
News from the Piano World
Where Did The Buttons Go?!
----------------------
Our April 2020 Newsletter Available Online Now...
The Piano World During the Pandemic!
----------------------
Posting Pictures on the Forums
-------------------
Forums RULES & HELP
-------------------
ADVERTISE on Piano World
(ad)
Best of Piano Buyer
 Best of Piano Buyer
(ad)
Faust Harrison Pianos
Faust Harrison 100+ Steinway pianos
Download Sheet Music
Virtual Sheet Music - Classical Sheet Music Downloads
New Topics - Multiple Forums
KDP110 vs. cn series/clavinova
by almo82 - 08/11/20 02:58 AM
Piano Practice/Exercises For Adult Learners
by onaiplatigid - 08/11/20 01:34 AM
1892 Broadwood & Sons Grand
by shaycave - 08/10/20 11:11 PM
Kontakt spaz attack
by MacMacMac - 08/10/20 10:52 PM
Talk me out of Embertone Walker 1955
by Harpuia - 08/10/20 09:51 PM
Forum Statistics
Forums41
Topics200,839
Posts2,990,472
Members98,099
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