Rim Width

[Erwinspiano@AOL.COM]

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In a message dated 9/7/2002 4:10:51 AM Pacific Daylight Time, 
mfarrel2@tampabay.rr.com writes:


> Subj:Re: Rim Width 
> Date:9/7/2002 4:10:51 AM Pacific Daylight Time
> From:<A HREF="mailto:mfarrel2@tampabay.rr.com">mfarrel2@tampabay.rr.com</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
> 
>          Terry 


       If you use commomn 2 by 4 lumber for your pressure blocks(cauls) this 
will be suffiecent to cover the  rasten board joint on any piano.  Also I 
would make them a degree and an half angle on the bottom as most Steinway 
rims are such and it relates to a 60 ft. radius.  The Stwy D joint width is 
quite wide. Mine is currently covered with stuff but I think its about 2 
inches on the spine (long) side and perhaps the rest is as well. Close enough 
for government work any way! Any way 2 by 4's will work fine.
  <<<Dale Erwin

> 
> 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
>   


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