A simple concept to achieve a rational chip form

Abstract A thorough study of the relationship between the tool chip contact length and the chip thickness ratio has been carried out. A series of tools with restricted contact lengths (0.2–1.3 mm) have been used to turn carbon steel (SS 1572-03), using different cutting data. The test results show that the relationship between the natural and the restricted contact length can be introduced as a control factor, K. By using this factor as a function of feed, the chip form can be classified as under-controlled, controlled or over-controlled . The test results also show that the control factor can be used in a simple module in the preparation process to ensure a rational chip form during the cutting process. The control factor as a function of feed can also be used as a short-time test method to establish the rational chip breaking area of the chip former groove.