Step 2: Choose your block
Exactly how you make your case is up to you, but ours was carved from a block of mahogany by a ShopBot CNC machine. Our design was simple so we made a 2D file and just set depths for the machine to cut (our DXF file is attached below). After routing, we handsanded the whole thing, but especially the edges to make them nice and rounded.We designed the lid to pressfit onto the body so there are no fasteners.
As long as it's hard and has some space to allow the knocking to reverbrate through the body, you're fine. We also cut an acrylic bracket that holds the parts (especially the solenoid) in place and away from the sides where they might dampen the sound.
We gave it a tongue for a nice tone, with the idea that we could make several blocks each with a different size tongue for a variety of tones.
As long as it's hard and has some space to allow the knocking to reverbrate through the body, you're fine. We also cut an acrylic bracket that holds the parts (especially the solenoid) in place and away from the sides where they might dampen the sound.
We gave it a tongue for a nice tone, with the idea that we could make several blocks each with a different size tongue for a variety of tones.
knock_block.dxf141 KB
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