カッティング
score
Japanese: スコア
A single scratch made with a glass cutter. Use this as a starting point to let the crack spread and break the glass. / Note: Do not trace over it again.
A single scratch made with a glass cutter. This serves as the starting point for a crack that spreads across the glass, causing it to break.
Note: Do not redraw.
Learn More
"Scoring" is the process of making a linear scratch on the surface of glass using a glass cutter. The cutter’s wheel severs the molecular bonds on the glass surface, and the stress that concentrates along this score allows the glass to be broken precisely during the subsequent breaking process. The score must be made only once; tracing the same line twice will cause the surface to shatter, making it impossible to break the glass cleanly.
A high-quality score is characterized by a continuous “shhh” sound and a uniform white scoring line (run). If the sound is intermittent or the line is uneven, this is a sign of a dull cutter blade or insufficient pressure. Properly replenishing the oil and moving the cutter at a consistent speed and pressure are essential for producing a stable score.
Related Concepts
The processes that follow scoring are breaking and running. Curved-cut requires more advanced scoring techniques than straight-cut.
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.