To the question "What is the finishing technique?" Kazumi Obata replies, "Finishing is to complete a product by adjusting it by hand using various sorts of tools to a level of precision beyond that of machines."
The products that Mr. Obata has had a hand in have all been high-tech, high-performance instruments, including large astronomical telescopes like "Subaru" on the summit of Mauna Kea in Hawaii and IC steppers and scanners. This work is not a simple matter of assembling parts. While assembling high-precision parts, various adjustments must be made for each part to achieve the necessary precision.
With improvements in the quality of machining, the precision of metal parts has risen in recent years. However, it is difficult to completely remove the slight imperfections that occur when processing parts. Correcting for these minor imperfections so as to bring the part to within an acceptable tolerance is one of the skills required in finishing.
Finishing is vital to the completion of high-precision products, and involves adjusting the surfaces and angles of joining parts as well as making various different adjustments to achieve the necessary precision.