Ditch the tuning pin bushings

[Erwinpiano]

  Hi  Dave

 Right you are ,it is highly beneficial for the tuning pin hole to lineup
with the bushing but also that the bushing be under some kind of compression
as is the tuning pin in the block. Why?  glad you all asked, because the
major amount of force caused by the string tension is translated from the
pin thru bushing and bears against the flange thereby negating the need for
much if any true pinblock to plate flange contact. Just restring any
oriental piano. I got my first lesson on this replacing strings and pinblock
on a few 1970's Yamahas.  Maybe there were two places that touched the
flange on the whole block.
    My solution was to fully fit the block with a good plate fange contact
and eliminate the bushing.  The piano tunes like a dream(Bolduc block)yeah
baby. Enough said?

     Dale Erwin



----- Original Message -----
From: "David Love" <davidlovepianos@hotmail.com>
To: <pianotech@ptg.org>
Sent: Thursday, May 10, 2001 4:38 PM
Subject: Re: TP bushings: was pinblock hole alignment


> Though I would agree that the need for tuning pin bushings for tuning
> stability is at least questionable, I believe there is enough density in
the
> bushing to prevent the pin from seating properly against the front of the
> hole in the block if they are sufficiently misaligned and the front side
of
> the bushing is much thicker that the distance between the edge of the hole
> in the block and the hole in the plate (there may be a clearer way to say
> that).  Since it is not so much trouble, I think it's prudent to make sure
> that the hole in bushing and the block line up as precisely as possible
and
> the best way to accomplish that is to drill through the bushing into the
> block.
>
> David Love
>
>
>
>
> >From: Wimblees@AOL.COM
> >Reply-To: pianotech@ptg.org
> >To: pianotech@ptg.org
> >Subject: Re: TP bushings: was pinblock hole alignment
> >Date: Thu, 10 May 2001 19:10:36 EDT
> >
> >In a message dated 5/10/01 5:45:58 PM Central Daylight Time,
> >davidlovepianos@hotmail.com writes:
> >
> >
> > > The issue is not whether the holes are centered but whether the hole
in
> >the
> > > bushing lines up with the hole in the block.  Bushings are not always
> > > uniform and even if they were it only takes a slight error in marking
to
> > > not
> > > have the hole in the bushings line up with the hole in the block.  If
> >they
> > > don't, the pin can bear on the bushing rather than on the front side
of
> >the
> > > hole in the block and can effect tuning stability.  Better to drill
> >through
> > > both insuring that the holes are aligned.
> > >
> > > David Love
> > >
> > >
> >
> >The wood of the bushing is not hard enough to effect the tuning pin, and
> >thus
> >effect tuning stability. I don't know why some companies use bushings in
> >the
> >first place. I guess maybe to look good, and keep the dust out of the pin
> >block. (that's a joke). Or maybe, as you have found, it centers the drill
> >when drilling holes in the pin block. Technically, you don't even have to
> >have bushings in plates that call for them, because I don't think it has
> >anything bearing on tuning stability.
> >
> >Just my 3 cents worth. (1 cent surcharge for higher gas prices). :)
> >
> >Willem
>
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