Optimal Milling Strategy For Entering Material From The Side
These animations show why an arc in the same direction as tool rotation is effective. The strategy is relevant for entering material from the edge, as well as for pocketing.
This video from cutting tool supplier Sandvik Coromant suggests the ideal way for a milling cutter to enter material from the side. As the different animations show, if the tool “arcs” into the material along an arc that follows the same direction as the tool’s rotation, then the load on the cutting edge varies gradually. By contrast, if the arc is opposite the tool’s rotation, or if the path is straight, then the shock to the tool is more pronounced.
These animations portray the tool entering into the straight edge of a rectangular part. However, the same idea applies to a tool entering the material from within a hole—such as a milling tool for roughing a pocket that enters the material from within a pre-drilled hole.
Composites are replacing metal in certain applications. What does this mean for machining?
Achieving acceptable tool life and hole quality in a material such as CFRP demands a drill designed with composites in mind.
Though it won’t replace high speed machining, Boeing sees “low speed machining” as a viable supplement to higher-rpm machines. Using new tools and techniques, a shop’s lower-rpm machining centers can realize much more of their potential productivity in milling aluminum aircraft parts.