Center Pin

[reggaepass at aol.com]

 JD, 

Thanks for this understanding of the importance of the taper.

Alan Eder


 


 

-----Original Message-----
From: John Delacour <JD at Pianomaker.co.uk>
To: Pianotech List <pianotech at ptg.org>
Sent: Fri, 15 Aug 2008 9:20 am
Subject: Re: Center Pin









At 12:07 -0400 15/8/08, reggaepass at aol.com wrote:?
?

>About those:  A helper recently asked if there is a reason that they 
>are sharpened to a fine point (which does make them harder to get 
>back into the canvas case they come in).  Thoughts??
?

The very gradual tapering of the point is most important so that no 
removal of the bushing can take place before the broach has passed 
through the bushings on both sides.  The first part of the broach 
should be smooth so that by the time the roughened part enters the 
bushing the broach is perfectly concentric with the bushings.?
?

JD?
?



 

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