To determine the deformed chip thickness, the produced chips were collected, and theirthicknesses were measured three times at three different areas, using a digital micrometer, with 10 µm resolution. The uncertainty of the carried out measurements of the chip thickness was around 5%.The average undeformed chip thickness was calculated based on a previously published work [34]The ratio between the deformed to the undeformed chip thickness was used to express the “chipcompression ratio”.