[pianotech] capstain/wippen angle, was: key position at rest

[David Love]

I see a potential key return problem.  The heal should move forward or the
capstan back depending on the overall geometry of the system.  The angle of
the capstan is similar to that which Jon describes in that it will rotate
from short of 90 degrees to the wippen heal, through a 90 degree position
and slightly past it.  That is the same system that I use-about 3 degrees
angled back.  This is slightly more but not enough to worry about reangling,
at least in my view.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Gene Nelson
Sent: Sunday, March 15, 2009 11:18 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] capstain/wippen angle, was: key position at rest

 

Lurking on this thread I find it very interesting.

Especially that I am working on similar.

Just curious if someone knowlegable could comment on the heal/capstan
interface positions in the photo - is this similar to the involute idea or
should the capstan be more centered on the heal??? Heal should be rotated
180 degrees???

In either case, both surfaces are curved. What would be the ideal interface
positioning???

In my mind they could be thought of as moving on two different planes
similar to the hammer tail/back check. The length of the leverarms determine
the plane???

Gene

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090315/983d1526/attachment.html>