Capstan angle

[David Love]

I'm not talking about the overlapping holes, you can simply plug the old
ones.  Flipping the angle will move the capstan contact point on the key
well away from the balance rail reducing the mechanical advantage
considerably (assuming the contact point on the wippen heel remains the
same.  Likely you would not have room under the heel to maintain the
same capstan/key contact point and have the top of the capstan centered
in any way under the wippen, if even contacting it at all.  You could,
of course, cut off the wippen heel and relocate it, you would then have
to recalculate the new wippen lever ratio into the equation.  

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Sarah Fox
Sent: Sunday, April 17, 2005 9:46 PM
To: Pianotech
Subject: Re: Capstan angle

Hi David,

> Flipping the angle the other way is not so easy unless you are going
to
> make new keys.

That's pretty much what I had concluded.  I was content with the SWR
about
where it was, and there was no need to reposition the capstan.  Flipping
the
capstan angle while preserving the position of the head would result in
overlapping holes.  Bummer....

> Unfortunately, the original angle often places the
> capstan so as to give the proper key ratio.  Flipping the angle the
> other way will likely result in a rather high overall action ratio.

You mean because of the contact point on the capstan being in the middle
of
the head, rather than on the far edge???

Ah well...  It's not something I'm burning to do.  ;-)

Peace,
Sarah


_______________________________________________
pianotech list info: https://www.moypiano.com/resources/#archives