troublesome rep.spring adj. (was Baldwin warranty / 743 question)

A440A@aol.com A440A@aol.com
Mon, 19 Apr 2004 14:26:14 EDT


<< Bill Spurlock on the other hand suggested the rate (relating to wire guage,

coil, etc.) of the springs is closely engineered to match the weight of

hammers, providing a wide range of effective adjustments. Major changes in

hammer weight however, take the springs outside their "predictable" range of

adjustment/response.


I can see both having a factor, in that firm pinning (this center needn't be

as free as the others) in the rep. lever will have a moderating effect on

the action of the rep. spring.

 >>

It is also wise to check the hammerflange pinning.  If it is loose, the 
spring is going to be set weaker than design specs.  In combination with a loose 
balancier pin, the spring may be far weaker than it was originally intended. 
   Also, if there is friction from corrosion in the spring seat,(grub), the 
action on the balancier may be atypical when winking the jacks.  Also consider 
the factors such as lack of proper lubrication on jack tip as well as 
aberrations on the leather of the knuckle.  A slight bump on the knuckle will prevent 
the smooth return.  
   I have had the majority of problems with this phenomenom on Baldwin pianos 
and others with the Schwander  configuration.  
Regards, 



Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
 

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