仕上げ
intermediate grinding
Japanese: 中研ぎ
An intermediate step in which rough scratches are refined using a medium-grit sandpaper.
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Intermediate grinding is a grinding process performed between rough grinding and polishing. It involves gradually increasing the grit size (e.g., 120 → 220 → 400) to smooth the surface while removing scratches from the previous process. Careful work at this stage determines the quality of the final finish.
The most important thing in intermediate grinding is to “move on to the next grit size only after the scratches from the previous step have been completely removed.” If you proceed to the next step while scratches remain, the finer grinding wheels will be unable to remove them, resulting in a white, cloudy finish. Once grinding at each grit level is complete, inspect the surface under transmitted light or at an angle to ensure the surface is uniform before proceeding to the next step.
Related Concepts
We design the finishing process with a focus on the four stages: rough grinding, grit number, felt pad, and polishing.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.