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A drill operating at ultrasonic frequencies (>20 kHz) will usually employ a hard abrasive powder to actually do the drilling. The drill bit (which could be soft) vibrates back and forth at a high frequency, and grinds the substrate away with the abrasive.

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Q: Is ultrasonic sound can drill a hole through a hard metal or a mountain?
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Related questions

Can ultrasonic wave pass through 1Cm thick iron plate?

Yes. Ultrasonic waves can pass through metal. The only difference between "normal" sound waves and ultrasonic waves is that we cannot hear ultrasonic waves. However, they behave the same.


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