to A442 & back(D)

[David Love]

I don't think it's so much that strings climb bridge pins.  Over time the
bridge pin will wear a small notch from the string sliding back and forth.
At the same time the termination point on the bridge gets lower as the
bridge cap compresses (exacerbated by hard tapping down of strings on the
bridge).  At some point, then, the string wants to ride in the notch on the
bridge pin and that point is above the seating level on the bridge.  The
lesson is that when seating strings on the bridge, tap the top of the bridge
pin down a bit, not the string, to lower that notching.

David Love


----- Original Message -----
From: "David Renaud" <drjazzca@yahoo.ca>
To: <pianotech@ptg.org>
Sent: May 05, 2002 7:00 AM
Subject: Re: to A442 & back(D)


>     Finding this an interesting discussion.
>
>     Did the D this morning and it was just fine,
> stable, was at A440. Barely moved things at all.
>
>     Going from A442 to A440, I had spent 1.5 hrs,
> to make 2.5 passes the day before, It moved allot
> through that first pass, less second, third was good,
> but I was suspicious of how it would hold, was fine.
>
>     Just to clarify for some who seem surprised
> at 8 cents causing "such" instability. We are not
> talking about so bad as not to pass. I became
> very fussy with this instrument lately.
>
>  I have been spoiled by doing this piano 16 times last
> month, this instrument became a pet project to see
> how far I could go refining what I do. It was
> extreamly stable, where I wanted, and the day
> they decided they wanted A442, I would not even have
> had to tune it, it was in great shape.
>
>     I think my expectations for this piano had
> gone up, and if we use a fine enough microscope
> things always move a bit. I was getting spoiled,
> and A442 meant 2 double tunings over 2 days to get it
> up and back down when I had only booked one spot
> , and was fully booked, with no extra time.
>
>
> So I have a remaining question.
>
> Why do strings sometime climb bridge pins?
> Is a flexing board enough on a big piano
> as I have suggested?
>
>
>                       Dave Renaud
>                       RPT
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