The present subject matter relates to automated gemstone feeding in a gemstone processing machine. In an implementation, the gemstone processing machine has a feeding conduit unit to receive a rough gemstone affixed to a holder from a user. The feeding conduit unit delivers the holder to a base plate. An actuating arm picks the holder from the base plate and transfers the holder to a pre-defined position in the gemstone processing machine. The automated feeding mechanism is controlled by the computing device and uses low-cost hardware equipment having limited or no manual intervention. Thus, providing an apt tradeoff between the accuracy of transfer of the rough gemstone and the cost associated with the equipment used for the processing of the gemstone.

A center shaft machining apparatus includes: a grinding structure that moves on a machining central axis while rotating about the machining central axis and machines an end surface on one end side of a workpiece arranged on the machining central axis; an end portion support structure that supports an opposite end side of the workpiece; and a shaft portion support structure that supports a shaft support portion set at an intermediate portion of the workpiece. The end portion support structure includes an eccentric mechanism capable of supporting an opposite end of the workpiece in a state where a workpiece central axis of the workpiece is eccentric with respect to the machining central axis.

A center shaft machining apparatus includes: a grinding structure that moves on a machining central axis while rotating about the machining central axis and machines an end surface on one end side of a workpiece arranged on the machining central axis; an end portion support structure that supports an opposite end side of the workpiece; and a shaft portion support structure that supports a shaft support portion set at an intermediate portion of the workpiece. The end portion support structure includes an eccentric mechanism capable of supporting an opposite end of the workpiece in a state where a workpiece central axis of the workpiece is eccentric with respect to the machining central axis.

A variable radius sanding block for sanding curved surfaces. The variable radius sanding block includes a base member and a plurality of variably sized radius patches. The base member is sized and proportioned to allow radius patches of varying size to be inserted, such that each of the radius patches will change the curvature of the sanding block upon insertion. The base member also having a folded flexible internal structure and a pair of flexible arms that facilitate insertion of radius patches of varying size. The radius patch includes a pair of grooves that receive the flexible arms of the base member and secure the base member to the radius patch.

A variable radius sanding block for sanding curved surfaces. The variable radius sanding block includes a base member and a plurality of variably sized radius patches. The base member is sized and proportioned to allow radius patches of varying size to be inserted, such that each of the radius patches will change the curvature of the sanding block upon insertion. The base member also having a folded flexible internal structure and a pair of flexible arms that facilitate insertion of radius patches of varying size. The radius patch includes a pair of grooves that receive the flexible arms of the base member and secure the base member to the radius patch.

A method for processing a ceramic honeycomb structure, the method comprising subjecting an outer peripheral surface of the ceramic honeycomb structure to centerless grinding in an in-feed mode by bringing a rotationally driving grinding wheel into contact with the outer peripheral surface of the ceramic honeycomb structure rotationally supported by an adjusting wheel, a blade, and a press roller.

A method for producing one or more bearing components along a production line, comprising honing the bearing components along the production line, cleaning the bearing components along the production line, grinding the bearing components along the production line, and transporting the bearing components along the production line utilizing one or more transport units.

A wheel burr cleaning device comprises a lower turnover system, a lower turnover system, a center hole burr brushing system, a back cavity burr brushing system, an upper lifting rotation system. The present disclosure not only can be used for removing burrs from the center hole of the wheel, the roots of the flanges and the edge of each spoke, but also can adapt to the wheels of different sizes and different widths.

The disclosure relates to a hardbanding removal apparatus and method for use with oilfield tubulars and downhole tools. The apparatus includes a tiltable frame with support arm, a grinding wheel coupled to the support arm, and an idler wheel assembly to supply mechanical feedback to the grinding wheel through the support arm. The mechanical feedback allows the grinding wheel to remove hardbanding accurately and uniformly on tubulars that are eccentric, curved, or have eccentric hardbanding. The tiltable frame enables grinding of tapered sections of the tubular without reorienting the tubular. The method includes removing hardbanding using the apparatus.

A wheel corner polishing device includes a station switching system, a valve hole polishing system, a bolt hole polishing system and a rim and cap section synchronous polishing system. The wheel corner polishing device can automatically polish four positions including bolt hole corners, a valve hole corner, outer rim corners and cap section corners of a wheel via upper and lower stations and coordination of the systems.