Radial Chip Thinning

During profile or side milling with a solid carbide end mill at 50% (ae) radial width of cut, the chip formed is at full-programmed thickness. When your radial depth of cut decreases to something less than 50%, the chip formed is not as thick. This is known as “radial chip thinning.” When less than 50% (ae) radial depths are used, it becomes necessary to increase your feed to achieve full chip thickness.

With the utilization of new programming methods, such as trochoidal and peel milling, manufacturers can increase productivity and tool life. These methods take advantage of much deeper (ap) axial cuts with less (ae) radial width of cut. With these methods, it’s possible to run higher surface footages (SFM or m/min) along with these higher feed rates (1PM or mm/min) because less heat is generated at the cutting zone. Plus, you’re utilizing chip thinning.

With SCTool’s super variable tools, harmonics have virtually been eliminated. Advancements in coatings enable our tools to withstand 900°F, thus eliminating heat concerns. In addition, machine tools have greatly advanced to take advantage of these new methods. Use the following chart as a reference to increase feed rates by multiplying the recommended feed rate by the increase feed factor, according to your (ae) radial depth of cut as % of (Dc) cutter diameter.

(ae) Radial Depth of Cut as to % of (Dc) Cutter DiameterIncrease Feed Factor