磨床 (móchuáng): grinding machine

磨床 specifically means an industrial grinding machine in mechanical engineering - surface grinder, cylindrical grinder, etc. For a kitchen grinder (coffee, pepper) use 磨 or 研磨机. In factory contexts, common types: 平面磨床 ('surface grinder'), 外圆磨床 ('cylindrical grinder').

memory

磨 ('to grind') + 床 ('bed') = 'grinding bed' - many Chinese names for industrial machines use 床 ('bed' as in machine-bed/work-table): 车床 ('lathe'), 铣床 ('milling machine'), 钻床 ('drill press'), 刨床 ('planer'). The 床 here means the supporting frame/table of the machine.