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Oceans Craig

#AmateurLuthier Saturday... my #SummerProject (steel string acoustic) progresses slowly. Doing the top bracing which has a lot of influence on the final sound of the guitar. But I'm not really 100% on exactly how. I suspect I know too much about frequency analysis and not enough about guitars as most explanations generate more questions in my mind.

view of what will be the inside of top-panel of an acoustic guitar showing all the little bits of wooden bracing - this view is from above so a sort of plan view. It is lit from the side to emphasize the bracing and hide some of the defects.
view of what will be the inside of top-panel of an acoustic guitar showing all the little bits of wooden bracing - this view is from low down at the bottom end so on a very shallow angle. It is lit from the opposite side also at a shallow angle - this emphasizes the bracing but also some of the defects.
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Stephen Bannasch (316 ppm)

@wavygk

At this stage I generated chladni patterns at multiple resonances and took away stiffness in order to make the main lower bout resonance a larger area with smoother borders.

Here’s an example of a Sitka Spruce top fora parlor guitar size at the beginning and end of probably 10 incremental steps carving and sanding away the braces. These steps both reduce weight and make the top less stiff.

See alt text for more info.

Photo of 237 Hz resonance pattern on back of Sitka Spruce top with taller and thicker bracing at beginning of carving and sanding material away to reduce weight and stiffness. The 237 Hz mode pattern is smoother larger irregular continuous circle centered on the lower bout and the discontinuities are gone. Nodes of pattern are displayed with tea leaves. Top is placed on tips of pointy stiff narrow foam pyramids. Underneath a low frequency speaker is swept until resonant patterns appear. Frequency is recorded and a photo is taken.
Photo of back of Sitka Spruce top with taller and thicker bracing at beginning of carving and sanding material away to reduce weight and stiffness.
Photo of back of Sitka Spruce top with less tall and thick bracing at end of carving and sanding material away to reduce weight and stiffness.
Photo of 246 Hz resonance pattern on back of Sitka Spruce top with taller and thicker bracing at beginning of carving and sanding material away to reduce weight and stiffness. The 246 Hz mode pattern is roughly a smooth irregular circle-diamond shape centered on the lower bout but there are sharp discontinuities at the sides and at the tail. Nodes of pattern are displayed with tea leaves. Top is placed on tips of pointy stiff narrow foam pyramids. Underneath a low frequency speaker is swept until resonant patterns appear. Frequency is recorded and a photo is taken.
#GuitarBuilding#TopTuning
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Stephen Bannasch (316 ppm)

@wavygk Any questions please feel welcome to ask.

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