Video: Finish-Milling Titanium With A 20-Flute End Mill
A tool with many flutes can be effective for achieving a productive metal removal rate in titanium, where speed and chip load are constrained. See how quickly the chips accumulate in this video.
A tool with many flutes permits a productive metal removal rate in titanium. Speed and chip load are both limited in titanium, so productivity has to come from other factors. A large number of flutes can multiply a low value of chip load (inches per tooth) into a productive linear feed rate (inches per minute). The 20-flute end mill shown here is a finishing tool, because it requires a low radial depth of cut. However, the accumulation of chips in this video illustrates the material removal rate it can achieve in this difficult-to-machine material. (Video courtesy of Boeing Research and Technology.)
Cutting holes by interpolating a face milling cutter may be a better process choice for many rough and even finish boring operations. Software improvements and better cutter designs allow expanding use of the versatile face mill for hole making.
Liquid coolant offers advantages unrelated to temperature. Forced air is the fluid of choice in this shop...but even so, conventional coolant can't be eliminated entirely.
With macros and canned cycles resident in the CNC on most contemporary turning centers, single point turning of OD threads can seem like almost a default process decision. However, for numerous applications, OD thread rolling has inherent advantages as an alternative to cutting threads.