Ditch the tuning pin bushings - One ? at a time

[Joseph Garrett]

David,
That is exactly the point I was making. Thanks for the clarification.
Regards,
Joe Garrett
----- Original Message -----
From: "David Skolnik" <skolnik@attglobal.net>
To: <pianotech@ptg.org>
Sent: Sunday, May 13, 2001 8:28 AM
Subject: Re: Ditch the tuning pin bushings - One ? at a time


> Ron-
> Thank you for your speedy consideration.  You get extra credit for your
> same-day response.
> Perhaps, for my own mind, I can try to be clear about one issue at a time.
>
> At 02:35 PM 05/12/2001 -0500, you wrote:
>
>
>  > How do the 'Lines of Force' differ in an openface block; bushing-less
> covered
>  > block; covered block with bushings?
>
>
> The force and leverage thing is mostly an issue of how much unsupported
pin
> there is between the bottom of the coil and the highest point of support,
be
> that pinblock top, bushing, or plate contact. This determines the tendency
to
> flagpole, and the psi load on the block.
>
>
> DS comment:
> (Actually sneaking in 3 questions)
>
> Ron, the "Lines of Force" to which I was referring comes from one of Joe
> Garrett's posting to this thread ( Fri, 11 May 2001 20:56:40 -0700).  The
> comparison between open face and covered (without bushings) asks to
explain
> the active purpose of the webbing in the support scheme, if same result
can
> be achieved without such.  Is the open face block installed in a
> significantly different way than the covered block?  The 'Lines of Force'
> issue with the tuning pin bushing vs. non-bushing is whether the pull of
> the strings on the block in the direction of the plate flange is reversed
> by the pivotal function of the bushings.  Is there agreement on this
question?
>
> David Skolnik
>