NTK’s Mogul Bar and novel chipbreaker solve boring chip control problem on Swiss machines

Typical difficulties incurred during a boring process on Swiss machines are chips remaining in the bore resulting in rough surfaces. NTK's Mogul Bars are equipped with the company's novel chipbreaker inserts to evacuate chips straight backwards, thus resolving the issue. NTK has also engineered a larger clearance area behind the insert for chip evacuation on the bar itself. This feature has been optimally designed without losing rigidity while offering a through coolant capability. Mogul Bars also increase rigidity as a result of a newly designed bar head configuration and a minimal flat width on the bar. The steel shank Mogul Bars can machine as deep as L/D = 5, a depth that normally requires expensive carbide shank boring bars. Furthermore, NTK offers a carbide shank Mogul Bar that can machine up to L/D = 7 depth and this gives users flexibility of machining deeper bores in a single process. From an insert perspective, NTK offers both coated carbide grades and cermet insert grades for Mogul Bars. Cermet grades can machine at higher speeds while delivering better surface finishes. These grades can achieve more accurate dimensional control than conventional carbide grades. The primary TiN/TiC substrate of cermet grades is chemically stable compared with the WC substrate of carbide grades, and has better adhesion resistance. Mogul Bars are available from a minimum machining diameter of 5 mm.