Mechanized Numerics, a small machine shop in Ann Arbor, Mich., pitted two "high performance" aluminum-cutting endmills against each other for a slotting demonstration the shop filmed and posted to YouTube in January 2015. According to the shop's YouTube channel, MechNum CNC, the cutter and parameters filmed for each machnie were nearly identical.

"The only real difference between the two cutters was their coating. The Viper was stealth-coated while the other was ZrN-coated," MechNum CNC reported, noting that the coatings shouldn't have had any impact on the results given the conservative feedrate used for the demonstration: 0.004" per minute.

The Destiny Tool Viper "vastly outperformed the other," MechNum CNC observed. While acknowledging the demonstration was not scientific, the shop noted that it only wanted "to show people the ridiculous sound from supercharging an endmill that can't be supercharged under these conditions."

Mechanized Numerics offers aluminum and plastics production work, as well as prototyping services for general CNC workpieces.