FIELD: machining with supersonic abrasive-liquid jets, drilling openings in sheet materials. SUBSTANCE: abrasive-liquid jet is directed perpendicular to the material to be machined. The jet is set in motion along the perimeter of the opening. The axis of symmetry of the jet is displaced from the axis of the symmetry of the opening by an amount . The ε amount is determined b an inequality: 
, where Rc is the jet diameter. EFFECT: enhanced accuracy and quality of drilled opening. 1 dwg, 1 tbl
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