Abstract: A polishing device is disclosed. The polishing device includes a load seat and two polishing mechanisms mounted on the load seat. Each polishing mechanism includes a driving member and a polishing member driven by the driving member. The two polishing members of the two polishing mechanisms are oppositely received in the receiving space, and oppositely rotatable driven by the corresponding driving member. The polishing members are rotated oppositely, such that the new burs generated by one of the polishing members can be removed by other one of the polishing members at the same time.

Abstract: A hanging module includes a fixing rod, a support arm, a plurality of fasteners, and a hanging assembly positioned on the support arm by the plurality of fasteners. The support arm is fixed to the fixing rod. The support arm defines a groove. The hanging assembly includes a locking member and a hanging member fixed to the locking member. The hanging member is received in the groove, and fixed to the locking member by the plurality of fasteners.

Abstract: A positioning structure includes a positioning base, a positioning member, a mounting member, a ball, and an elastic member. The positioning base defines a fastening hole. The positioning member is positioned in the fastening hole. The mounting member includes a fixing portion and an assembling portion extending from the fixing portion. The assembling portion is inserted into the positioning member. The fixing portion defines a receiving groove extending to the assembling portion. The assembling portion defines an exposing hole communicating with the receiving groove. The ball is received in the exposing hole. The elastic member is movably inserted into the receiving groove, and resists the ball to be partly exposed from the exposing hole to abut the positioning member, which enable the positioning base to be positioned on the machining device. The present disclosure further provides a machining device using the positioning structure.

Abstract: A size inspection device includes a detecting platform, a positioning assembly, four first detecting assemblies, four second detecting assemblies, a third detecting assembly, and a controller. The detecting platform includes a mounting plate. The positioning assembly is detachably mounted on the mounting plate for holding the workpiece on the detecting platform. The controller is electronically connected to the first detecting assemblies, the second detecting assemblies, and the third detecting assembly. The four first detecting assemblies and the four second detecting assemblies are slidably mounted on the mounting plate and are capable of obtaining a first moving distance and a second moving distance respectively. The third detecting assembly is mounted on the mounting plate and is capable of obtaining a third moving distance. The controller obtains the moving distances and determines whether or not the workpiece is of passing or failing quality.