This paper describes a comparison of the replica method and the cross-sectional measurement method for measuring the inner shape of small glass holes. The former utilizes indirect measurement, while the latter uses direct measurement. First, we made a hole through a glass plate. Next, we made a replica of the hole and measured its outer surface with a non-contact measurement instrument to determine the diameter of the replica. To measure the hole using a cross-sectional method, we first ground the glass plate and exposed the inner hole shape, then we analyzed the hole circle image and calculated the diameter of the glass hole. Finally, we compared the two diameters and confirmed that both were accurate. In conclusion, the replica method is as effective as the cross-sectional measurement method for measuring the inner shape of small glass holes.

View full abstract

The present study was performed to clarify the polishing properties in the case of flat and concave plates utilizing magnetic compound fluid (MCF) with the application of a magnetic field having a DC or pulse waveform. With regard to polishing of the flat plate, the effect of the distance between the polishing tool and the polished surface was investigated at each application of a steady magnetic field and a pulse magnetic field with a frequency of 0.1 Hz. With the former magnetic field, the polishing characteristics were different at every interval between the tool and the polishing surface. With the latter magnetic field, the polishing characteristics were the same over the range of δ from 0.75 to 1.75 mm for the interval between the tool and the polishing surface. Based on these results, we conducted experiments involving polishing the concave surface of a part of a spherical pit with small diameter using the tool operated parallel to the surface. The results indicated that the configuration was maintained more accurately under a pulsed magnetic field than a DC magnetic field.

View full abstract

We have developed a wireless communication holder system to monitor various physical quantities during processing in multiple channels. This holder system was shown to be effective for estimating the processing temperature in end-milling and the vibration in radial and axial directions in boring of rotating machining tools. We have implemented a function for monitoring tool rotational direction in this holder system, to explore the processing phenomenon in end-milling and tapping. This report presents the effectiveness of this holder system.

View full abstract