Various examples are provided for polishing techniques for flexible tubular workpieces. In one example, a method includes supporting a tubular workpiece on a rod that extends axially through it; positioning a turning wheel against an external surface of the tubular workpiece, where it is held by magnetic attraction; and rotating the tubular workpiece by rotating the turning wheel. The external surface of the tubular workpiece is polished by the abrasive particles during rotation of the tubular workpiece. In another example, a polishing system includes a workpiece holder including a rod configured to axially support a tubular workpiece; a turning wheel with abrasive particles distributed about an outer surface; a wheel support assembly configured to position the outer surface of the turning wheel against the an external surface of the tubular workpiece, where it is held by magnetic attraction. The external surface is polished during rotation of the tubular workpiece.

A magnetic-disk glass substrate containing an alkali metal component as a glass composition includes a pair of main surfaces and an outer circumferential side edge surface that is a mirror surface. The outer circumferential side edge surface includes a surface with a roughness percentage that is 40% or more when a bearing ratio of a roughness cross-sectional area is 50%, in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the outer circumferential side edge surface obtained by etching the outer circumferential side edge surface by 2.5 m is measured.

A magnetic-disk glass substrate containing an alkali metal component as a glass composition includes a pair of main surfaces and an outer circumferential side edge surface that is a mirror surface. The outer circumferential side edge surface includes a surface with a roughness percentage that is 40% or more when a bearing ratio of a roughness cross-sectional area is 50%, in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the outer circumferential side edge surface obtained by etching the outer circumferential side edge surface by 2.5 m is measured.

An edge surface of a magnetic-disk glass substrate containing an alkali metal component as a glass composition is a mirror surface, and in a bearing ratio curve of roughness cross-sectional areas obtained by measuring a surface roughness of the edge surface obtained by etching the edge surface by 2.5 m, a roughness percentage when a bearing ratio of a roughness cross-sectional area is 50% is 40% or more.

Various examples are provided for hybrid tools including fixed-abrasive and loose- abrasive phases. In one example, a hybrid tool for finishing an internal surface of a workpiece includes a metallic rod and magnetic abrasive bonded to one or more defined portions of the metallic rod by an adhesive that dissolves when n contact with a lubricant used to finish the internal surface of the workpiece. In another example, a method for finishing an internal surface of a workpiece includes mounting the workpiece in a chuck of a lathe; positioning a hybrid tool inside an internal cavity of the workpiece using one or more pole-tips; providing an amount of the lubricant to the internal cavity; and rotating the workpiece with the lathe while controlling positioning of the hybrid tool inside the internal cavity using the one or more pole-types.

A magnetic drive transmission method includes the steps of: disposing solid magnetic device and ring-shaped magnetic device at top and bottom surfaces of work platform, while keeping the solid magnetic device in axial alignment with the hollow inner diameter of the ring-shaped magnetic device the solid magnetic device enters within the magnetic field lines of the ring-shaped magnetic device so as to create a magnetic field downstream between the solid magnetic device and the ring-shaped magnetic device that changes the thrust of the same polarity repulsion and to further cause the solid magnetic device and the ring-shaped magnetic device to attract each other in a balanced manner, and then using the ring-shaped magnetic device to drive the solid magnetic device in moving a predetermined workpiece along one surface of the work platform to a predetermined location.

An edge finishing apparatus includes a surface, a fluid delivery device configured to deliver at least one magnetorheological polishing fluid (MPF) ribbon to the at least one well, at least one magnet placed adjacent to the surface to selectively apply a magnetic field in a vicinity of the surface, and at least one holder placed in opposing relation to the surface, the at least one holder being configured to support at least one article such that an edge of the at least one article can be selectively immersed in the MPF ribbon delivered to the at least one well.

An edge finishing apparatus includes a surface, a fluid delivery device configured to deliver at least one magnetorheological polishing fluid (MPF) ribbon to the at least one well, at least one magnet placed adjacent to the surface to selectively apply a magnetic field in a vicinity of the surface, and at least one holder placed in opposing relation to the surface, the at least one holder being configured to support at least one article such that an edge of the at least one article can be selectively immersed in the MPF ribbon delivered to the at least one well.

Disclosed are various embodiments for a system and method of processing a surface using a mixture containing magnetic particles. A mixture is disposed on a workpiece and exposed to a dynamic magnetic field. In response to the dynamic magnetic field, the magnetic particles of the mixture may move along the workpiece. The movement of the magnetic particles creates a pattern of grooves on the surface of the workpiece.

Disclosed are various embodiments for a system and method of processing a surface using a mixture containing magnetic particles. A mixture is disposed on a workpiece and exposed to a dynamic magnetic field. In response to the dynamic magnetic field, the magnetic particles of the mixture may move along the workpiece. The movement of the magnetic particles creates a pattern of grooves on the surface of the workpiece.