Piezo
grabcad
This cost-effective design employs the piezoelectric effect and weighs just 2.3 grams. Dimensions are W=19.96mm, H=23.52mm, L=20.19mm. Assembly instructions are shown in an image. It offers proof pressure of 3PSI and burst pressure of 5PSI. Ease of assembly is ensured through snap-fits, while manufacturing simplicity comes from the required draft angles (see images with draft analysis). For undercuts, CUMSA's flexible cores can be used. Plastic covers are manufactured via injection molding. There are only 2 plastic covers, 1 piezoelectric crystal, 1 PCB, and 2 electrodes. The entrance cover is made of ABS, while the back cover (with snap-fits) should be softer, like Polypropylene.
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