The longitudinal polishing process used in the NG-AutoPol system is designed to remove surface irregularities and residual stresses along the specimen’s axis without altering its geometry or introducing new defects. The process operates through controlled linear motion, where the sandpaper moves parallel to the length of the specimen under precisely regulated pressure and speed.

Each section of the abrasive paper makes a single contact with the specimen surface—this single-contact motion prevents overheating, over-polishing, and distortion of the gauge section. The system’s automation maintains a constant polishing force and consistent contact length, ensuring an even surface finish and low residual stress distribution.

Throughout the cycle, the NG-AutoPol can automatically switch between multiple sandpaper grits, progressing from coarse to fine abrasives to achieve the desired smoothness. The result is a uniform, mirror-like finish that meets the requirements of tensile and fatigue testing standards, improving test repeatability and data accuracy.

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