soundboard has gone berserk (cupping) - not assembled yet

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wombosi
Amateur luthier
Posts: 143
Joined: Wed Jan 31, 2018 10:00 pm
Location: Great Barrington, MA

soundboard has gone berserk (cupping) - not assembled yet

Post by wombosi » Thu Feb 21, 2019 9:20 pm

bftobin wrote:
Thu Feb 21, 2019 9:04 pm
Is the grain on the 'donut' parallel to the grain in the top or perpendicular and is it WRC as well ? I like to put them perpendicular for strength and I haven't run in to this problem. Cedar is usually more stable than spruce, but if the donut is a different material, that could do it too.

Brent
Donut is spruce, and grain is parallel.

wombosi
Amateur luthier
Posts: 143
Joined: Wed Jan 31, 2018 10:00 pm
Location: Great Barrington, MA

Re: soundboard has gone berserk (cupping) - not assembled yet

Post by wombosi » Thu Feb 21, 2019 9:21 pm

wombosi wrote:
Thu Feb 21, 2019 9:20 pm
bftobin wrote:
Thu Feb 21, 2019 9:04 pm
Is the grain on the 'donut' parallel to the grain in the top or perpendicular and is it WRC as well ? I like to put them perpendicular for strength and I haven't run in to this problem. Cedar is usually more stable than spruce, but if the donut is a different material, that could do it too.

Brent
Donut is spruce, and grain is parallel.
What is the fix here? The lower bout can be clamped flat between cauls. The area around and above the rosette is more problematic. All the cupping is compound S shaped.

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