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darrenking
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31/01/2019 1:26 am  

Ok, time to work on the back of the soundboards. Marked them up with a laser cut template and then shot the bottoms of all the braces prior to bonding. It’s been a long time since I made shavings like this!

39280B32 2543 4E47 89DE 1C11DF63F7CF
14C26D84 142D 4D7F ADA7 01D6483F2709
7737BD77 5122 4785 BFF4 507608717953
24FA006C 1374 4CF6 B9D6 F393948A2FB0
5F4B9C96 0985 49ED 97FD 6D07066FB41E

 


darrenking
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05/02/2019 12:53 am  

My first soundboard pretty much finished I think. Just got to cut the channels into the sides/kerfing and it can be glued on. Having cut a couple of channels by hand I think I might make a jig for the rest of them! The plans I am working to (not Mark’s, I had already downloaded these before finding Mark’s course) show two additional soundhole braces in some photos and the round reinforcement in others. Given that the rosette inlay machining only leaves about 0.8mm of soundboard I have gone for the full round reinforcement. Interested to hear any opinions on the pros and cons of both options.

2EC4D726 9FA8 4E8A 9756 4C2FBD373B9C
948601C4 7EE7 418C 93BB 1E653F026C06
CFC2BE2B AC1C 4B61 B5DC 7D2C6A29EAAC


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darrenking
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05/02/2019 12:09 pm  

Is there a guide to the ideal weight for a soundboard complete with all its braces? Clearly this would vary a little with different woods and more with different sizes but is there an accepted formula? eg weight of braces = 80% weight of soundboard. Has anybody weighed their soundboards before and after bracing?


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mark bailey
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05/02/2019 2:10 pm  
Posted by: darrenking

Is there a guide to the ideal weight for a soundboard complete with all its braces? Clearly this would vary a little with different woods and more with different sizes but is there an accepted formula? eg weight of braces = 80% weight of soundboard. Has anybody weighed their soundboards before and after bracing?

Not to my knowledge Darren.

I think 'stiffness' is a better way to measure i.e. top deflection method

Measure twice, cut once...


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darrenking
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06/02/2019 12:12 am  

Thanks Mark, I shall check it out

Darren


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darrenking
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13/02/2019 8:33 am  

Good morning,

I have a cedar soundboard which is noticeably more flexible with the grain (side to side) than the spruce ones. Is this just typical of cedar or should I avoid using it?


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mark bailey
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13/02/2019 1:34 pm  

It is normal - To compensate Cedar is normally left a little thicker (=> 3mm is not unusual)

Measure twice, cut once...


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