Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > February 1998 > 1998.02.18 > 09Prev  Next


Cracked Plate in Old Bechstein Grand
By Douglas K. Rhodes

Although a Bechstein grand piano does not come precisely under the
heading of mechanical (automatic) musical instrument, I have some
questions for the engineers out there.

I am researching repair feasibility for an 1891 Bechstein 6' 8" grand
that has three cracks in the plate.  It is one of at least three
Bechstein grands with cracked plates in this region (Vancouver Island,
British Columbia, Canada).  Apparently this is not an uncommon problem,
and is probably representative of a basic design flaw in the older
Bechsteins.

The series of articles on this subject by Bob Hohf, RPT, in the Piano
Technicians Journals (Dec 1996, Feb & Mar 1997), was thoughtful and
informative.  However, I am not convinced that Bob's theory for the
cause of the cracks is entirely correct, and my initial research
suggests that so-called cold-welding of the cracks will almost certainly
guarantee future failure.

Are there any of you out there who have tackled the Bechstein plate/
pinblock conundrum?  I'd appreciate any comments (particularly before
I commit myself to do the job), and would be pleased to supply more
details of the problem at hand (with graphics) to those interested
by private email.

Doug Rhodes, RPT
Victoria, BC  Canada
drhodes@islandnet.com

 [ As I understand it from Doug, the plate on this transitional design
 [ does not encompass the pin block; instead, it has cast-iron 'arms'
 [ to which the block is attached. (I hope I have this right.)  Humidity
 [ extremes might contribute additional stress.  What new (and old)
 [ techniques are there for repairing broken castings?   -- Robbie


(Message sent Wed 18 Feb 1998, 19:58:52 GMT, from time zone GMT-0800.)

Key Words in Subject:  Bechstein, Cracked, Grand, Old, Plate

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2018 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                     
Translate This Page

. .