Rake Angle, and More

[Farrell]

Richard wrote:
"Which condition then should be most critical to adress in the action we have.... the 90 degree position of the hammer to string, or the 90 degree direction of the crowns movement to the string?"

IF I am understanding all this correctly, when the hammer butt center is in the plane of the strings, we will have the hammer perpendicular to the string at contact, AND we will have 90 degree direction of the crown's movement to the string. Actually, it is the crown's arc whose tangent is perpendicular to the string at hammer/string contact. So its not either, or, but rather both.

Terry Farrell
  
----- Original Message ----- 
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: "Pianotech" <pianotech@ptg.org>
Sent: Friday, March 14, 2003 12:54 PM
Subject: Re: Rake Angle, and More


> Hi Jim
> 
> For my part I am delighted with your appearance on the list, and your
> informative comments. My own remarks were meant to express my own confusion at
> what was being said.... an attempt at prompting a presisering if you will. The
> written word, especially the short format we allow ourselves here, is ofte
> times easliy misunderstood unfortunatly, and posts go by sometimes so fast that
> we miss out on a key point here or there.
> 
> Anyways.... thanks for your postings, and I do have one question still hanging
> in this thread. Which condition then should be most critical to adress in the
> action we have.... the 90 degree position of the hammer to string, or the 90
> degree direction of the crowns movement to the string ? I guess I'm looking for
> some pros and cons,... what the tradesoffs are tho at least some are quite
> obvious.
> 
> Thanks again
> 
> RicB
> 
> 
> 
> James Ellis wrote:
> 
> > I see that my comments about "rake angle" have stirred up other comments
> > and arguments.  All I was trying to do was to show you fellows that just
> > because the hammer is pointed straight toward the string, it does not mean
> > that it is moving in that direction.
> >
> > As long as we have actions where hammers are attached to shanks that swing
> > in arcs, we will have hammers that do not move straight toward the strings.
> >  No matter what we do, that hammer is going to be rotating about an axis as
> > it moves toward the string, and the crown will hit the string a somewhat
> > glancing blow.  All we are trying to do is to minimize that glancing blow.
> > Actions have been visualized in people's minds that enable the hammers to
> > hit the strings straight on, but they are very impractical, so we don't go
> > there.  We just stay with what is practical, and try to minimize the
> > shortcomings.
> >
> > Sincerely, Jim Ellis, RPT
> >
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
> 
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
> 
> 
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives