more Rake Angle stuff

[gordon stelter]

I dunno. It seems to me that a hammer CAN be made to
hit "poipendikilar" (Popeye, ca. 1935) to the string
by making the angle to the shank plenty obtuse.
    But, in fact, this angle seems to be ACUTE in the
pianos I've seen, so I still like my explanation
regarding strength at the shank-hammer joint. Care to
convince me otherwise?
     Thump

    But, in fact,
--- Phillip Ford <fordpiano@earthlink.net> wrote:
> >Gentlemen:
> >
> >I have been reading the latest posts on this
> subject, and I see that some
> >confusion still exists....
> >
> >In a real piano, be it grand or vertical, in
> today's world, there is no
> way
> >to make the crown of the hammer hit the string in a
> perfectly
> perpendicular
> >direction.  You just can't do it.....
> >
> >Sincerely, Jim Ellis
> 
> This is a bit strong.  Let's say that I mount the
> hammer to a linear bearing which slides along a rod
> which is oriented perpendicular to the string plane.
>  I then devise an action to throw this hammer to the
> string.  The crown of the hammer would be moving
> perpendicular to the string at contact (actually,
> during its entire travel).  This is but one of
> several 'designs' which my twisted mind can imagine
> for causing the hammer to strike perpendicular to
> the string.  Any of them could be done in today's
> world.  Whether any of them is practical,
> economically feasible, or would find acceptance with
> pianists is another story.  Perhaps you would prefer
> to say, that in an action of current conventional
> design, with the hammer rigidly affixed to a shank
> and rotating about a fixed rotational axis which
> cannot lie in the string plane, the crown of the
> hammer cannot be made to move perpendicular to the
> string at impact.
> 
> Phil F
> 
> 
> Phillip Ford
> Piano Service & Restoration
> 1777 Yosemite Ave - 130
> San Francisco, CA  94124
> _______________________________________________
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