ostsileerival ultrahelisagedusel töötav tööpink keraamika ja kõvade sulamite ultrahelitöötluseks, nt materjali eemaldamiseks ja peenendamiseks (vt ultrahelitöötlus), machine for removing material by abrasive bombardment and crushing in which a relatively soft tool, matching the shape produced, is made to oscillate at ultrasonic frequencies and drives the abrasive grit, suspended in a liquid, against the work; eg rotary ultrasonic machine used to produce deep holes with tip level precision in ceramics and alloys (see: ultrasonic machining)