Discussion
Ceramics and glass are machined by
Answer: B
Ceramics and glass are machined by ultrasonic machining.
Ultrasonic machining removes material by abrasive grains hammered against the work by a tool vibrating at about 20 kHz. It works best on hard, brittle materials that fracture in small chips, such as glass and ceramics.
Electric discharge machining, electrochemical machining and transferred-arc plasma machining all need an electrically conducting workpiece, so they cannot cut glass or most ceramics.
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