TP bushings: was pinblock hole alignment

[David Love]

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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