noun
centerless grinding; centreless grinding
Technical term in manufacturing for grinding cylindrical workpieces without using centers.
心無し研削は、軸物部品の大量生産に適した加工法です。
Centerless grinding is a machining method suited for mass production of shaft parts.
Compound of 心無し (shinnashi, 'without a center') and 研削 (kensaku, 'grinding').