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kencierp
PostPosted: Tue Nov 04, 2014 6:41 pm 
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Location: Litchfield MI
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Great point John -- many find it difficult to visualize the reality that inner most waist curve of spherical shape of the back plate is the high point. I always highly recommend Johnathan Kinkead's construction manual --- but even in that publication he shows a rim profiling method that fails to take this geometry into account.

I am not sure I could see the slope of 1 1/2 degree from the sound hole to the neck block the difference is about .06" or so.

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John Arnold
PostPosted: Tue Nov 04, 2014 10:19 pm 
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Joined: Wed Sep 08, 2010 12:17 am
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First name: John
Last Name: Arnold
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Quote:
I am not sure I could see the slope of 1 1/2 degree from the sound hole to the neck block the difference is about .06" or so.

I have pre-profiled sides from Martin dating from the 1960's, 1970's and 1980's. None of them have the curvature on the top edge that John alludes to. They are all profiled on the back edge, however.

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