CrazyDrill Non-Ferrous type NN and type NK
two types of drill bits for non-ferrous metals

As noted, non-ferrous materials such as copper, lead-free brass, and aluminium cause significant adhesive tool wear, which shortens tool life and reduces process reliability.
The optimized cutting geometry, combined with a ceramic-based coating featuring low friction and high hardness, reduces adhesive wear by more than 40 percent, ensuring longer and more consistent tool life.

As discussed, non-ferrous metals often cause material adhesion during drilling, leading to built-up edge formation.

The new TDP ceramic-based coating minimizes adhesion through its smooth surface combined with an optimized cutting geometry, enabling improved chip flow and more stable cutting conditions.

Non‑ferrous materials are highly ductile and tend to produce long chips, leading to chip evacuation issues, chip jamming, and bird nesting.
For effective chip management, chips must be kept as short as possible, a challenging task when drilling ductile materials.

The chip-forming geometry, the feed per revolution, and the front helix angle, create the desired chip form, which breaks once it reaches the degressive flute, ensuring a smooth and reliable chip evacuation, preventing interruptions, and maintaining a stable machining process.

Moreover, a degressive flute with constant core diameter guarantees: 

• Rapid chip removal preventing chip jamming 
• Robust drill configuration to avoid drill breakage

To maintain process reliability, pecking cycles are typically used to keep chips short and avoid evacuation issues. Machines with limited spindle speeds cannot fully exploit the cutting speed potential of non‑ferrous materials. When combined with standard solid carbide drills with limited feed per revolution and step depth, this results in longer cycle times.

The new CrazyDrill Non‑Ferrous overcomes these limitations by enabling higher feed rates and deeper drilling steps, while ensuring excellent chip control and a reliable process, allowing customers to maintain higher productivity levels.

Many industries require a surface roughness of ≤ 0.8 μm. Achieving this level of finish on highly ductile materials requires a precise balance between friction, cutting performance, and heat generation. If this balance is not maintained, excessive friction and localized heat can lead to material adhesion, resulting in lower surface quality, reduced process stability, and inconsistent machining results.

CrazyDrill Non-Ferrous is designed to address these challenges by combining optimized cutting geometry, advanced coating, and an efficient coolant system. This approach ensures the right balance between friction, cutting performance, and thermal control, enabling high-performance machining while consistently achieving superior surface quality.

• CrazyDrill Non-Ferrous NN 5 x d: thanks to the high degree of self-centering capability, on regular and straight surfaces the use of a centering or pilot hole is not needed. In case of inclined surfaces, CrazyDrill Crosspilot can be used as pilot drill. When dealing with irregular and/or rough surfaces, to achieve high-precision position accuracy, CrazyDrill Twicenter may be used as a center drill. 
• CrazyDrill Non-Ferrous NN/NK 8 x d: thanks to the high degree of self-centering capability, on regular and straight surfaces the use of a centering or pilot hole is not needed. On irregular respectively rough or inclined surfaces or for high-precision position accuracy: CrazyDrill Pilot SST-Inox as pilot drill, CrazyDrill Twicenter as center drill, CrazyDrill Crosspilot as pilot drill for inclined surfaces
• CrazyDrill Non-Ferrous NN/NK 12 x d: as perfect preparation for high-precision position accuracy: CrazyDrill Pilot SST-Inox as pilot drill, CrazyDrill Twicenter as center drill and CrazyDrill Crosspilot as pilot drill for inclined surfaces
• Diameter range version NN/NK 8 x d and 12 x d: 0.2 mm – 2.0 mm (.008” - .079”, fractional inches available)
• Diameter range version NN 5 x d: 2.0 mm – 6.35 mm (.079” - .25”, fractional inches available)
• Increments: every 0.05 mm (.002”) up to diameter 4.00mm and every 0.1 mm (.004”) up to diameter 6.35 mm
• CrazyDrill Non-Ferrous with usable length up to 12 x d
• Two types of drill bits: CrazDrill Non-Ferrous type NN for drilling with external cooling and CrazyDrill Non-Ferrous type NK, the drill with integrated cooling channels

• Drill tip geometry specifically engineered for drilling lead-free brass, aluminium, copper, and other non-ferrous alloys
• Digressive, patented helical flutes
• Sturdy tungsten carbide shaft with through-tool cooling channels for CrazyDrill Non-Ferrous type NK
• Tungsten carbide grade with high fracture toughness and thermal shock resistance
• Wear-resistant and heat-resistant high-performance ceramic-based coating TDP 
• Self-centering capability
• Deeper pecking capability
• Short chip formation
• Excellent chip management and removal
• High feed rates
• Extended tool life
• Excellent hole surface quality (almost reaming quality)
• Excellent drilling precision (roundness, straightness, diameter precision)
• Mikron Tool produces all tools with highest repeatability and precision. Hence the user will benefit from long term stable production conditions (stable process and machining precision)