2-Flute Ball End Mill: AlTiN Coated for HRC55 Finishing

2-Flute Ball End Mill for Precision 3D Contouring

A 2-flute ball end mill designed for precision 3D contouring and complex surface finishing in hardened materials. The NCP-2B series features 30° spiral angle geometry, AlTiN coating, and is suitable for machining hardened steels (HRC45-55 depending on cutting conditions), mold materials (NAK80, P20), and aerospace alloys. The two-flute design provides efficient chip evacuation and reduced cutting forces compared to 4-flute variants, making it ideal for die & mold machining where surface finish Ra 0.4-0.8μm is typically achievable under controlled conditions.

Product Overview

The NCP-2B series ball nose end mill covers nose radius from R0.5mm to R10.0mm across 24 standard configurations. All tools feature integral cemented carbide construction (YK25SF substrate), 2-flute geometry, and TiAlXN coating for extended tool life in hardened materials. This design prioritizes chip evacuation and surface quality over metal removal rate, making it suitable for semi-finishing and finishing operations in aerospace component finishing and precision mold cavities.

Production capacity: 50,000 pieces/month | Customization: OEM coating, non-standard ball radius, extended length available upon request.

Technical Specifications

When to Use 2-Flute Ball End Mills

Choose 2-flute ball nose cutters over 4-flute variants when:

• Deep cavity machining with limited chip space (L/D ratio >3:1)
• Finishing operations where surface quality prioritizes over removal rate
• Softer materials (aluminum, copper, graphite) where chip welding risk is high
• Older or less rigid machines where chatter suppression is critical

For harder materials (HRC52-62) with optimized geometry, consider the Hard Material Specific Two Blade Ball End Mill. For deep pockets requiring extended reach (L/D >5:1), see the Long Shank Ball End Mill variant.

Technical consultation: Share your material grade + hardness + tool diameter + spindle RPM limit + coolant type/pressure + tool overhang (L/D ratio). We provide conservative/optimal/aggressive parameter sets within 24 working hours.

Dimensional Standards: NCP-2B Series

The table below lists 24 standard configurations covering micro-diameter (R0.5mm) to standard sizes (R10.0mm). Custom ball radii, extended lengths, and non-standard shank diameters are available with MOQ negotiation.

Note: Lead time for standard sizes: 3-5 working days. Custom configurations: 7-15 working days depending on complexity.

Recommended Cutting Parameters

Starting parameters for NCP-2B series in common materials. Adjust based on machine rigidity, coolant pressure (minimum 15 bar recommended), and actual tool overhang.

Conditions: High-pressure coolant (15-30 bar), CAM toolpath with trochoidal engagement, runout <0.005mm. Surface finish results vary with machine stability and actual cutting conditions.

Troubleshooting Guide

For complex failure analysis, refer to Ball Nose End Mill Mastery for case studies on HRC55+ machining.

Frequently Asked Questions

When should I choose 2-flute over 4-flute ball end mills?

Select 2-flute designs for finishing operations where chip evacuation is critical (deep cavities, soft materials like aluminum or copper, or machines with limited coolant pressure). Choose 4-flute for semi-roughing in stable setups with high coolant flow and rigid machines.

What is the maximum L/D ratio for the NCP-2B series?

Standard configurations support L/D ratios up to 4:1. For deeper reach (L/D 5:1 to 8:1), specify extended-length variants or consider our long-shank series with reinforced core diameter.

How do I avoid chipping the ball nose during entry/exit moves?

Use helical or ramping entry strategies with lead angles 2-5°. Ensure CAM software generates tangent lead-in/out moves (minimum arc length 2× ball radius). Avoid plunge cuts perpendicular to the surface.

Can I request custom ball radii not listed in the standard table?

Yes. Custom ball radii (e.g., R0.75mm, R3.5mm) are available with MOQ typically 20-50 pieces depending on diameter. Lead time: 10-15 working days. Provide target radius ±0.005mm tolerance requirement.

What is the difference between TiAlXN and AlTiN coatings?

TiAlXN (standard NCP-2B coating) offers balanced wear resistance and oxidation stability up to 800°C, suitable for general hardened steel machining. AlTiN variant provides higher hardness (HV 3200+) and better performance in continuous high-speed cuts but may be more brittle in interrupted operations. Specify coating preference at order.

Request Custom Quote

For Engineers: Share material grade + hardness (HRC) + required ball radius + spindle speed limit (RPM) + coolant type/pressure (bar) + tool overhang (L/D ratio). We provide within 24 working hours: recommended tool spec, conservative/optimal/aggressive cutting parameters, and failure troubleshooting checklist. Contact technical support.

For Procurement: Provide specification (ball radius + quantity + delivery timeline). We respond within 24 hours with pricing, support OEM branding, custom packaging options, and provide material certificates and inspection reports upon request. Submit RFQ.