Function of the rim

[Avery Todd]

Just for the record, I don't think I posted any of the below
messages. So, if they're wrong, don't blame me! :-)

Avery

At 11:49 PM 09/01/03 -0700, you wrote:

>----- Original Message -----
>From: "Farrell" <mfarrel2@tampabay.rr.com>
>To: "Pianotech" <pianotech@ptg.org>
>Sent: September 01, 2003 4:22 PM
>Subject: Re: Function of the rim
>
>
> > Yes, that is likely the best answer of the four, but it think the real
>reason is to have the pin at a very slightly acute angle to the string so
>that a tight coil in maintained.
> >
> > Terry Farrell
> >
> > ----- Original Message -----
> > From: "Avery Todd" <avery@ev1.net>
> > To: "Pianotech" <pianotech@ptg.org>
> > Sent: Monday, September 01, 2003 4:58 PM
> > Subject: Re: Function of the rim
> >
> > > >Here's another head-scratcher.  I didn't find any other clinkers.
> > > >
> > > >75) The tuning pin hole is drilled at a slight angle to the pinblock
> > > >primarily in order to
> > > >
> > > >       A. create an orderly row of pins
> > > >       B. resist the pull of the string under tension
> > > >       C. create a better lock of the pinblock to plate flange angle
> > > >       D. satisfy tradition
> > > >
> > > >In their answer key, the right answer is
>.......................................... C
> > > >
>
>I would take exception to all but D. I've never had a satisfactory answer
>to this question from anyone at any of the factories that employ the
>practice. Finally, after making up a sample and a drawing it came to me. My
>answer was published in the Journal some time back. Basically, the
>pinblocks in certain pianos using three-ply pinblocks and with plates
>covering the blocks which were drilled and pinned without any kind of
>bushing surrounding the pin had a tendency to split. By using a relatively
>small hole bored vertically in the plate with a pin angled back
>sufficiently it was possible to let the pin rest against the plate at the
>bottom of the hole while looking nicely centered at the top.
>
>If you don't believe me, do the math, make the sample and draw the picture.
>As to the idea that it helps keep a tight coil...well, look at the angles
>involved. It does exactly the opposite. Or look it up in the Journal. When
>pianos using this system are tuned the strings walk down the pin actually
>spreading the coils.
>
>Del
>
>
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