Welcome to the Piano World Piano Forums
Over 2 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!

SEARCH
the Forums & Piano World

This custom search works much better than the built in one and allows searching older posts.
(ad 125) Sweetwater - Digital Keyboards & Other Gear
Digital Pianos at Sweetwater
(ad) Pearl River
Pearl River Pianos
(ad) Pianoteq
(ad) P B Guide
Acoustic & Digital Piano Guide
PianoSupplies.com (150)
Piano Accessories Music Related Gifts Piano Tuning Equipment Piano Moving Equipment
We now offer Gift Certificates in our online store!
(ad) Estonia Piano
Estonia Piano
Quick Links to Useful Stuff
Our Classified Ads
Find Piano Professionals-

*Piano Dealers - Piano Stores
*Piano Tuners
*Piano Teachers
*Piano Movers
*Piano Restorations
*Piano Manufacturers
*Organs

Quick Links:
*Advertise On Piano World
*Free Piano Newsletter
*Online Piano Recitals
*Piano Recitals Index
*Piano Accessories
* Buying a Piano
*Buying A Acoustic Piano
*Buying a Digital Piano
*Pianos for Sale
*Sell Your Piano
*How Old is My Piano?
*Piano Books
*Piano Art, Pictures, & Posters
*Directory/Site Map
*Contest
*Links
*Virtual Piano
*Music Word Search
*Piano Screen Saver
*Piano Videos
*Virtual Piano Chords
Topic Options
#2109600 - 06/28/13 11:16 AM Downbearing and Soundboard Crown
Jim Dunleavy Offline
Full Member

Registered: 02/27/05
Posts: 229
Loc: The Original Washington (UK)
I've been having a go at measuring the downbearing in my upright prior to removing the strings. It's a 1937 Kemble and (to the best of my knowledge) has never had soundboard work done on it since it was made.

Before I go into details of what I've measured, my first question is whether it's typical for an instrument of this age and my second question is should I attempt to adjust it by putting on thinner understring felt.

I don't have a proper gauge, so I used the method described in Reblitz, using dental tape stretched across between the top and bottom fixing points. However I found it extremely difficult to measure with any accuracy.

All I could conclude is that at the bass bridge, there is somewhere between zero and slightly negative downbearing, increasing to a slight positive downbearing in the treble.

The soundboard itself appears in good condition, with no cracks that I can see, and the ribs are solidly attached for their full length - the ribs are vertical on this piano.

I can measure a slight crown by putting a 2 foot steel rule between the ribs and measuring the gap at the centre with feeler gauges. A similar crown (obviously in the opposite direction) is measureable on the front surface of the soundboard (but this is only accessible at the far left hand side).

The gap measured between each pair of ribs at the rear varies between about .040" and .060".
_________________________
Jim (amateur musician and composer..and piano tinkerer).

Restoration Project Videos

Top
(ad PTG 568) Grand Action Regulation in 37 Steps
Grand Action Regulation in 37 Steps
#2109646 - 06/28/13 12:27 PM Re: Downbearing and Soundboard Crown [Re: Jim Dunleavy]
Gene Nelson Offline
1000 Post Club Member

Registered: 09/10/04
Posts: 1510
Loc: Old Hangtown California
If you can measure some bearing as well as some crown you are in really good shape.
I would not do anything to increase bearing, It will likely do nothing more than take away crown.
_________________________
RPT
PTG Member

Top
#2109652 - 06/28/13 12:39 PM Re: Downbearing and Soundboard Crown [Re: Jim Dunleavy]
BDB Offline
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21671
Loc: Oakland
Keep in mind that after you remove the strings from a piano, it may take a while for the soundboard to resume its original shape. It is best to judge a soundboard by how it sounds.
_________________________
Semipro Tech

Top
#2109654 - 06/28/13 12:43 PM Re: Downbearing and Soundboard Crown [Re: Jim Dunleavy]
Jim Dunleavy Offline
Full Member

Registered: 02/27/05
Posts: 229
Loc: The Original Washington (UK)
Thanks guys. It sounded OK, so I'll take your advice and leave it alone.

It's best to leave the old understring felt on then?
_________________________
Jim (amateur musician and composer..and piano tinkerer).

Restoration Project Videos

Top
#2109681 - 06/28/13 01:05 PM Re: Downbearing and Soundboard Crown [Re: Jim Dunleavy]
BDB Offline
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21671
Loc: Oakland
I would replace it.
_________________________
Semipro Tech

Top
#2109703 - 06/28/13 01:45 PM Re: Downbearing and Soundboard Crown [Re: BDB]
Jim Dunleavy Offline
Full Member

Registered: 02/27/05
Posts: 229
Loc: The Original Washington (UK)
Originally Posted By: BDB
I would replace it.


I'm certainly tempted to, as it's old and filthy. Plus I've already bought new stringing felt.

As long as I use the same thickness it should be OK presumably.
_________________________
Jim (amateur musician and composer..and piano tinkerer).

Restoration Project Videos

Top

Moderator:  Piano World 
What's Hot!!
8 Live Ragtime Piano Players on the Cape!
-------------------
HOW TO POST PICTURES on the Piano Forums
-------------------
Sharing is Caring!
About the Buttons
-------------------
(125ad) Dampp Chaser
Dampp Chaser Piano Life Saver
Ad (Seiler/Knabe)
Seiler Pianos
Sheet Music
(PW is an affiliate)
Sheet Music Plus Featured Sale
(ad) HAILUN Pianos
Hailun Pianos - Click for More
(ad) Lindeblad Piano
Lindeblad Piano Restoration
New Topics - Multiple Forums
Need help with chords
by Shirz
Today at 07:52 AM
Which are the best forums for piano technicians and DIYers?
by Withindale
Today at 03:17 AM
Prelude
by noobpianist90
Today at 01:55 AM
Red Striped Screws and Fancy Nuts
by chernobieff
Yesterday at 11:57 PM
Communication outside of lessons
by Arghhh
Yesterday at 10:23 PM
Who's Online
98 registered (anotherscott, angga888, beeboss, alfredo capurso, 33 invisible), 1226 Guests and 17 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
76651 Members
42 Forums
158487 Topics
2327488 Posts

Max Online: 15252 @ 03/21/10 11:39 PM
(ads by Google)

Visit our online store for gifts for music lovers

 
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 | Donate | Link to Us | Classifieds |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter | Press Room |


copyright 1997 - 2014 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission