The portion of one tool path intentionally covered again by the next adjacent path, stated as a distance or percentage of working width.
GlassRenu media library · Image source · Image source
Meaning and boundaries
Nominal half-disc overlap is not the same as half of the true contact patch and may change with tilt, pad compression, edge use, and operator motion.
Why it matters in glass restoration
Overlap influences coverage uniformity, dwell distribution, ridges, valleys, heat, and visible banding.