[pianotech] Reversing Crown

[Noah Frere]

Yes. It's amazing that I went into this assessment feeling prepared and
knowledgeable, and have made such a mess of it. I think next time I will
bring a *list* of things to assess. After all the classes I've been to, the
partial rebuilding of an upright, the downbearing measurements I've taken,
the pianotech forum discussions I've read... - yet I just didn't think to
measure downbearing.  Nor did i know crown was so complex. I'm still pretty
new at this, after 3 1/2 years, but this is by far the biggest mistake I've
made, as well as a huge learning experience. I thank all of you for your
generosity and knowledge.

On Thu, Dec 24, 2009 at 2:22 PM, Ron Nossaman <rnossaman at cox.net> wrote:

> Noah Frere wrote:
>
>> Hmm..I didn't measure bearing.
>>
>
> Then you didn't have enough information to make an informed evaluation of
> the condition of the soundboard.
>
>
>
>  Are you saying that finding positive bearing and crown decreases or
>> eliminates the chance of the board reversing after string removal?
>>
>
> It depends on how much bearing and crown, and where you measure it. Also,
> the crown doesn't have to reverse with string removal for the board to be
> dead.
>
>
>
>  Or are you just saing that the more carefully we analyze the instrument
>> before rebuilding, the more accurate our estimate will be? I believe the
>> latter. -Noah
>>
>
> Yes, of course. Try to know what you're doing and why.
> Ron N
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20091231/f58ec7ad/attachment.htm>