Magnetic barrel finishing is used to reduce roughness and for deburring of objects made by lost wax casting of precious metals. The use of materials that are harder than 200 HV is increasing in the jewelry industry. This makes it difficult to achieve the required surface roughness. This study focused on the water flow in the container, which can affect machining performance. The results indicated that flow was generated in the same direction as the magnetic disk rotation and in the opposite direction. There were also conditions where the flow did not occur. The orbital motion of the medium mainly produces flow in the direction of rotation of the disk and the motion like paddling mainly produces flow in the opposite direction. We concluded that no water flow occurs and the machining performance is higher when these two types of flow are offset.

This paper describes the design and manufacturing technologies for producing sheet metal parts of machine tools. Here, we focus on the size and shape of expanding sheet metal to advance a novel technology for producing sheet metal parts. First, we discuss the aspect ratio and the mass of expanding sheet metal considering the golden ratio. Next, we propose smart sheet metal part for use as a telescopic cover to monitor its strain during operation. The results indicated that the golden ratio is an effective parameter to estimate sheet metal parts and the proposed smart sheet metal makes it feasible to monitor state conditions during machine tool operation.