Plate Screws !!

[Roger Jolly]

Hi Jim,
          With two well placed cut off bars and a good quality hardwood
liner the amount of trapezium distortion taking place on the rim would be
greatly minimized.  The cut off bars can serve 2 purposes.  1. Acoustic. 2.
brace the perimerter of the rim. The Steinway I that I'm working on has a
very solid cut off bar in the lower treble end, plus the cut off section is
filled with 2" thick hardwood. The whole back assembly is the most solid
that I've seen on a vertical. Laminated oak vertical beams (3ply). 

The least amount of movement in a rim structure the more likely the screws
will remain tight.
Amen for the good old days of over engineering.

This might? have some thing to do will the incredible tuning stability,
that one fines on some of these old Steinway's.

Warm regards Roger 



At 09:19 AM 06/09/99 -0400, you wrote:
>
>In a message dated 9/05/1999 11:08:54 PM, nossaman@SOUTHWIND.NET writes:
>
><< First, why would the number
>of screws involved have any bearing on whether they are loose or not? I
>don't see a connection here. >>
>
>Ron;
> I don't know that the "number" or quantity of screws would have any bearing 
>on whether any were loose or not. It just seemed odd to me that there were 
>'no' screws loose out of that number................if it had been a grand I 
>would have expected several loose screws and would not have been not been 
>surprised to find them.
>  No "connection" was intended that is why I used the ( )s :-).
>
>   It is an altogether interesting plate design with screws running 
>completely around the perimeter with the exception of a 24" stretch in the 
>bass..... In addition to the plate design, the soundboard has cutoffs in the 
>top left hand and bottom right hand corners thus effectively giving a kinda 
>odd trapezoidal/rectangular shape to the speaking/crowned area of the board
>Jim Bryant (FL)
> 
Roger Jolly
BaldwinYamaha Piano Centre
Saskatoon and Regina
Saskatchewan, Canada.
306-665-0213
Fax 652-0505