Patent ID: 7938716

Claim:
An apparatus for spiral polishing with electromagnetic abrasive, comprising: a clamp, being a rotatable clamping member; a lead screw, being clamped by said clamp and having a first side, a second side and a bottom; a first electromagnet, disposed at said first side of said lead screw and having a first end and a second end; a second electromagnet, disposed at said second side of said lead screw and having a first end and a second end, said first end of said first electromagnet facing said first end of said second electromagnet, the magnetism of the first end of said second electromagnet being the same as the magnetism of said first end of said first electromagnet; a fixture, having a number of holes thereon; a processed object, having an inner bore surface to be polished and being secured by said fixture and located among said first electromagnet, said second electromagnet and said lead screw; and an accommodating unit, having an airtight space therein to accommodate said clamp, said lead screw, said first electromagnet, said second electromagnet, said fixture, and said processed object, said accommodating unit further comprising abrasive therein.