When milling, interruptions (holes or slots) should be prevented from being covered as much as possible. This type of interrupted cutting causes frequent feeds and unfavourable retractions, thus imposing a higher standard on the cutting edge of the tool or, in the case of exceeding the range of workpieces that include interruptions, reducing the recommended feed rate by 50% to ensure that thin chips result when retracting the tool.TPM series milling discs with TPM series WN milling blades save sharpening time during machining, reduce costs, ensure quality machining and increase productivity.