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>
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