[pianotech] Capo Bars

[PAULREVENKOJONES at aol.com]

Dean:
 
There is a mythology here that begs correction. Brass is not  
"self-lubricating". There is no "lubricity" to it at all. There is a  significantly lower 
friction coefficient between brass and steel than between  cast iron and steel 
particularly because of the different galling  characteristics of them. 
 
Paul
 
 
In a message dated 3/5/2009 7:44:29 A.M. Central Standard Time,  
deanmay at pianorebuilders.com writes:

Young  Chang started doing this in the mid 90s, don't know if they still do.
They  used a brass rod instead of steel. Music wire on brass is  self
lubricating.

Dean

Dean May         cell 812.239.3359 

PianoRebuilders.com    812.235.5272 

Terre Haute IN  47802

-----Original  Message-----
From: pianotech-bounces at ptg.org  [mailto:pianotech-bounces at ptg.org] On Behalf
Of Richard Brekne
Sent:  Thursday, March 05, 2009 4:30 AM
To: pianotech at ptg.org
Subject: Re:  [pianotech] Capo Bars

Good question... and I'm looking forward to  reading the replies.  FTR, 
Bohemia pianos, a spinoff of Petrof after  the splitup of Czechoslavakia 
actually did do this for a while... I'm  unsure if they still do. They 
used some kind of bronze alloy I believe.  Perhaps its a question of 
tooling and expense  ?

RicB


Why do manufacturers harden capo bars  rather than cast (or grind)
the underside of the strut flat,  rout out a groove to receive a
steel rod of proper radius,  shape and hardness and insert it there
where it could, when  it's worn, be easily changed and where the
consistency would  be more easily controlled.  Is there a compelling
reason  not to do it that way?   







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