[CAUT] Digest, Vol 1103, Issue 85 Moving Wippen Rail

[David Love]

I'm not sure exactly what you mean, but in the case of an angled capstan,
the effective load will not be where the capstan enters the key, but at a
point on the key which is directly below where the capstan and wippen heal
contact point is.  In other words, if you want to straighten an angled
capstan and maintain the same key ratio, you should drill for the new
capstan position directly below where the capstan/wippen heal contact point
is.  If you straighten the capstan but keep the hole location the same, you
will reduce the key ratio.  Don't know if that relates to the issue at large
as I haven't been following the thread enough lately to comment on whether
the analogy is a good one or not.

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Keith
Roberts
Sent: Friday, November 02, 2007 2:15 PM
To: College and University Technicians
Subject: Re: [CAUT] Digest, Vol 1103, Issue 85 Moving Wippen Rail

 

A question back to you. A balance type scale. It has a platform 4 inches
across. the weight doesn't change due to where you put the load on the
platform. It is still transfered back to the point on the lever that the
platform is attached. According to you if we move the load farther from the
fulcrum the weight should change. The design of the intermediary device has
a lot to do with it I think. 

 

Keith

 

On 11/2/07, Richard Brekne <ricb at pianostemmer.no> wrote: 

Hi Keith

Been thinking on an off about this during the day and it dawned on me
that your idea of the jack center being the determinant for the output 
arm length and that the angle the jack takes makes no difference is
analogous to the position of the capstan hole on the key being the
determinant  for the output arm length of a key and that it matters not
which angle you insert the capstan. 

I'll leave it to you to take it from there.

Cheers
RicB



 

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