rib radius

[Erwinspiano@AOL.COM]

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     Del
  I think we said the same thing using different words although it would have 
been helpful if I'd used the word rib in relationship to rib/ or board crown. 
I was responding to the earlier post speaking directly about rib curvature so 
I didn't think further clarification needed. Anyway, now no one should be 
unclear.
>>>>>Dale Erwin

> >>         Dittos Terry. 
>>     I Know of no on using less crown in the treble. At least many are 
>> using 60ft. thru out and many of us increasing radius into  the treble. I 
>> think the confusion is that a 60 ft. curve on a 40 inch rib appears to 
>> have proportionally more crown (7-8 mm) than a 15 inch rib with a 25 ft. 
>> curve ( 1.5mm) when observed visually. 
>> >>>>>Dale Erwin>>>>>>>>
>> 
>  
> Dale & Terry,
>  
> Let's define our terms here. When talking about increasing or decreasing 
> crown we're generally referring to the amount of visible curvature in the 
> system -- a particular rib or the whole board. So an increase in crown 
> means the system has more visible curve and a decrease in crown has less. 
> It's the radius of the curve that is changing. Now, if we're talking about 
> radius then a rib cut to a 40' radius has more crown than does a rib cut to 
> a numerically larger 60' radius. Regardless of length.
>  
> We use ribs of smaller radius (larger crown) in the treble and ribs of 
> larger radius (smaller crown) in the bass.
>  
> At least I think that's what Terry was referring to?
>  
> Del
> 


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