HARVI™ I TE: The Multi-purpose Superhero

Steve George: It’s a tool that can work in a variety of materials and types of cut while maintaining the high-performance of application-specific tools. Often, it’s confused with so called “general purpose tools”, which are designed to work in many applications, but will not come even close to application-specific tools in terms of feeds and speeds. That’s what is special about the HARVI I TE – it’s versatile in the best way possible. In fact, the Edison Awards recognized it with a gold award as a game-changing innovation in metal cutting. 

Steve George: Each metal demands certain characteristics from a tool. For example, an end mill for titanium should have sharp edges and a lot of relief to decrease the cutting forces. As for steel, vibration reduction and damping properties are crucial. In Inconel, the overall strength of the tool and efficient heat evacuation are important. So, we had to engineer the HARVI I TE with “superpowers” to meet the demands of multiple metals. That was a true challenge!

Danny Davis: There are three main features which we have applied to achieve these capabilities. One of them is the revolutionary design of the twisted end face, which distributes the forces equally, spreading them out as opposed to being one directional. Secondly, the HARVI I TE has deep gashes, which help pull the chips down into the flutes and effectively evacuate them, which is crucial in plunging. The third feature is the unique shape of the dish. Standard tools have a flat dish, which is the limiting factor in ramping and plunging. So, we've made a variable-angle dish: we have a curve going across the end face, which helps protect the tool's center. This allows 45° ramping capabilities. 

Danny Davis: Yes! We wanted to ensure that the HARVI I TE could ramp high angles not only for demonstration purposes but also in everyday applications. So, we repeated the 45° ramp cut more than one thousand times with a single HARVI I TE and got great results each time. 

Danny Davis: The biggest challenge was to create a tool rigid enough to take the massive forces generated while slotting and still have room for chip formation and ejection. This is because slotting generates lots of chips very quickly. That’s where the HARVI I TE’s patented parabolic core and “W” flute shape come in. Along with the gashes I’ve already mentioned, they provide extraordinary chip evacuation capabilities, allowing full width slotting.

Danny Davis: Roughing, slotting, semi-finishing, finishing, helical interpolation... We tested  the HARVI I TE on all those applications and with different parameters, so we made sure it can do the job from the very first cut until the part is finished. It’s not a gimmick; see for yourself, it’s all on video.

Steve George: HARVI I TE gets the job done in titanium, different types of steel, Inconel, cast iron. Take your pick. But to push our tool to the limits, we ran a test that was totally out of the box. We cut four different materials simultaneously with a single HARVI I TE end mill. You can watch it in the video below!

Steve George: We listened to our customers. They told us they needed one tool for multiple applications and materials. From there, we assembled a team of Kennametal experts to the create the HARVI I TE solid end mill, including specialists in geometry design, grinding, CNC programming, machining and coating. There were also specialists who field tested the tool with customers before its official release. It took a massive, cross-functional effort, but that’s how innovations are made.