Rim Width

[Farrell]

Roger, Roger, you flatter me to the point of sillyness! I appreciate your input, but no one has entrusted me to put my first soundboard into their S&S D! My first board will go in a no-name micro-grand. However, I have the need to make up a set of clamping cauls and I wish for them to work on any grand. That is why I was asking about how wide the soundboard/rim contact area is on a piano with a thick inner rim. Also, with your method, one would also have to consider the little trimmed corner of the inside top of the rim - if I remember correctly (I have not seen many pianos with the boards out!) the width of the soundboard/rim contact area is most often not the full width of the inner rim.

The reason I am concerned with this is, first of all, I am prone to worry about rather inconsequential things that likely make no difference whatsoever, and second, I think most rim-top bevels are in the one degree area, and boards that I will be making will be meeting the rim bevel at a two or possibly even three degree angle. My concern is that if I make my cauls out of 1.5-inch thick lumber and make the bottom edge at a one degree angle (I'll have to check and see what angle most rims are beveled at - but I think it is close to one degree) to meet the rim bevel, I might be stressing the highly-crowned board a bit. Perhaps a one or two degree difference between board angle and caul bottom angle is just a not a concern. 

Any opinions? Or should I just go back to bed and dream about tuning the perfect unison and not concern myself with rim bevels?

Terry Farrell
  
----- Original Message ----- 
From: "jolly roger" <baldyam@sk.sympatico.ca>
To: <pianotech@ptg.org>
Sent: Saturday, September 07, 2002 2:02 AM
Subject: Re: Rim Width


> 
> Hi Terry,
>                  Just measure the thickness of the outer rim, and then the 
> thickness of the rim at the bottom and subtract.
> 
> Roger
> 
> At 09:40 PM 9/6/02 -0400, you wrote:
> >How wide is the inner rim beveled area of a Steinway D - or what width is 
> >about the maximum that one commonly runs across (that is, how thick is the 
> >joint between the inner rim top surface and the soundboard edge)? I need 
> >to make clamping blocks for clamping a soundboard to the rim, and want to 
> >make the lower edge (the part that presses against the soundboard) as wide 
> >as the wider beveled areas of pianos. I know the D has a fairly thick rim 
> >- but perhaps that doesn't have much to do with how wide the beveled top 
> >part is.Thanks.
> >
> >Terry Farrell
> >
> 
>