We have been developing a diamond wheel that uses a thermoplastic resin as a bonding material to obtain the same surface properties as polishing by grinding alone. In this study, roughness was measured after grinding the ends of optical fiber used in telecommunications with wheels of different grain sizes, using dry or wet grinding. A mirror-finished surface on the end face of the optical fiber was achieved with dry grinding using a thermoplastic resin bonded wheel with grain size finer than #6000. The optical connection loss between optical fibers was less than the general specification value of 0.1 dB.

To determine the insert fixing characteristics of indexable cutting tools, we examined the maximum fixing resistance between cemented carbide and die steel, and the insert displacement behavior of a prototype tool. To examine the maximum fixing resistance, the influence of surface roughness and streak direction in the coupling surface between cemented carbide and die steel was evaluated. Then, the three-dimensional displacement behaviors of the insert against axial, radial, and anti-rotational loads were examined. Furthermore, the influences of the surface roughness and streak direction on the clamping face of the body on the insert fixing characteristics were evaluated, and the correlation with the results of the maximum fixing resistance was confirmed.