Product Overview

The Kyocera 34 7.00mm Solid Carbide Drill (CDR00357) is a premium-grade solid carbide drilling tool engineered for high-performance CNC machining centers. Featuring an advanced CA6535 substrate with optimized PVD coating architecture, this drill delivers exceptional wear resistance, thermal stability, and chip evacuation across demanding production environments. Designed for through-hole and blind-hole applications in ferrous and non-ferrous materials, the 34 series ensures repeatable dimensional accuracy and superior surface integrity.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details - Key Grade Characteristics

CA6535 is a high-performance PVD-coated fine-grain carbide grade specifically developed for solid carbide drilling applications in the 7.00 mm diameter range. The substrate combines a cobalt-enriched tungsten carbide matrix with a multi-layer TiAlN+TiSiN coating stack, delivering:

• Hardness: 1,650 HV ( substrate ) / 3,200 HV ( coating )
• Transverse Rupture Strength: 4,200 MPa
• Oxidation Resistance: Up to 900°C continuous operating temperature
• Coating Thickness: 2.5 ± 0.3 μm
• Friction Coefficient: 0.35 (dry machining against AISI 1045)
• Edge Preparation: Micro-honed T-land (0.05 mm × 20°)

Grade Comparison Matrix

Chipbreaker Profile

The 34 7.00 mm drill incorporates a proprietary double-margin chipbreaker geometry with polished flute surfaces (Ra 0.2 μm). The chipbreaker features:

• Primary Rake Angle: 12° (positive) for reduced cutting forces
• Secondary Land Width: 0.08 mm at 25° for edge reinforcement
• Margin Width: 0.15 mm per flute for hole-wall burnishing
• Chipbreaker Depth: 0.04 mm with sinusoidal groove pattern
• Flute Polishing: Mirror-finish flute grinding to prevent built-up edge (BUE)

Recommended Applications & Workpiece Materials

Application Map by Operation

Recommended Cutting Conditions

Values are starting recommendations. Optimize based on machine rigidity, workpiece fixturing, and coolant delivery pressure (minimum 20 bar recommended for through-tool coolant).

Operating Guidelines

• Runout Tolerance: Maintain TIR ≤ 0.01 mm at the tool tip. Excessive runout accelerates corner wear and compromises hole tolerance.
• Coolant Pressure: For through-tool coolant applications, maintain 20–70 bar pressure. External flood coolant is acceptable for shallow holes (<1.5×D).
• Peck Cycle: Recommended for blind holes deeper than 2×D. Peck increment = 0.5×D with full retract to break chips.
• Entry Angle: For inclined or curved surfaces, use a pilot hole or reduce feed by 50% for the first 0.5×D to prevent walk.
• Tool Life Monitoring: Replace or regrind when flank wear (VB) exceeds 0.15 mm or when burr formation at hole exit increases significantly.
• Re-sharpening: Maximum 2 regrinds recommended. Regrind only the point geometry; do not alter the flute profile.

Toolholder Compatibility

Packaging & Ordering Information

Catalog Meta Data

All technical data and recommendations are provided as general guidelines. Always consult your Kyocera application engineer for material-specific optimization and fixture design review.