Pinblock/Frame Separation

[Farrell]

You got it right Bill. Bend is at bottom of pinblock, but there is still
enough movement forward of strings that the dampers will not lift from
string upon playing - it will likely affect downbearing also.

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com

----- Original Message -----
From: <Bdshull@AOL.COM>
To: <pianotech@ptg.org>
Sent: Wednesday, July 26, 2000 8:55 PM
Subject: Re: Pinblock/Frame Separation


> Hi, Keith:
>
> I believed that more of the string line/vbar was moving than Terry
indicated
> (I could be wrong).  My thinking was that the plate was bending more
> gradually, extending further down.  I'm trying to remember the Hamilton
plate
> - if there is not a lot of vertical strut-like or "cupola/flange" design
in
> that area, then you are right, most of the bend could be at the pressure
bar.
>  My recent, personal point of reference was an Alcoa Aluminum Special,
with
> more strut work;  the dampers had stopped lifting.....
>
> The plate will be in a stressed position until it is pulled back into the
> original location,  But the downbearing may not be affected as much as I
> thought based on the scenario presented.  I have seen broken Hamilton
plates,
> but not from back separation (not yet).  And if the pivot is at the bottom
of
> the pinblock, there may still be a slight margin of downbearing loss.
>
> Where I am coming from is that more of these separated backs can be pulled
> back together if we give the repair enough time.  If closing the gap is
> desirable (certainly we all would agree on that), why not close the gap?
>
> Thanks, Keith.
>
> Bill Shull, RPT
>
>
> In a message dated 7/26/00 4:33:56 PM Pacific Daylight Time,
kam544@flash.net
> writes:
>
> << Since you have chosen to support Newton's comment, would you, or
Newton,
>  care to explain how downbearing will be affected if the gap is not
>  completely closed, yet made completely stable with the repair suggestion
I
>  gave.
>
>  Please keep in mind the original post indicated:
>  "...If you draw a line from the pressure bar in the high treble,
extending
> out
>  to the edge of the plate, this is where most of the bend occurrs (at the
>  base of the pinblock)..."
>
>  Keith McGavern
>  Registered Piano Technician
>  Oklahoma Chapter 731
>  Piano Technicians Guild
>  USA >>
>