Product Overview

The Kyocera 2.1mm Solid Carbide Drill (MPN: SGM07957) is a precision-engineered 2-flute drilling tool manufactured in Japan. Designed for cnc cast iron, this grade PR1705 drill delivers exceptional dimensional accuracy, superior surface finish, and extended tool life in demanding CNC environments. The optimized point geometry and advanced carbide substrate ensure stable chip evacuation and minimal burr formation across a wide range of workpiece materials.

ISO Designation Breakdown

Engineering Dimensions & Geometry

Grade Details — Key Grade Characteristics

Grade PR1705: CVD-coated grade designed for cast iron and ductile iron applications with high thermal stability.

Grade Comparison Matrix

Chipbreaker Profile

The SGM series features an optimized flute profile engineered for mild steel applications. The 30° helix angle with polished flute surfaces ensures smooth chip evacuation, reducing built-up edge and minimizing heat retention at the cutting edge. The dual-margin design provides superior hole straightness and surface finish quality.

Recommended Applications & Workpiece Materials

• Mild Steel: Ideal for continuous and interrupted cuts in mild steel with stable chip formation.
• Alloy Steels: Suitable for 4140, 4340, and similar medium-carbon alloys up to 35 HRC.
• Cast Irons: Compatible with gray cast iron (GG25) and nodular iron (GGG40) at optimized speeds.
• Non-Ferrous: Effective in aluminum alloys when used with appropriate coolant strategy.
• General Engineering: Perfect for precision holes in automotive, aerospace, and mold-making sectors.

Application Map by Operation

Recommended Cutting Conditions

Note: Values are starting recommendations. Adjust based on machine rigidity, workpiece clamping, and coolant delivery efficiency.

Operating Guidelines

• Runout: Maintain spindle runout ≤ 0.01 mm to prevent premature edge chipping and hole oversize.
• Peck Drilling: For holes deeper than 3×D, use a peck cycle with retract to 1×D above the bottom of each peck.
• Coolant Pressure: Minimum 70 bar (1,000 psi) for through-tool coolant; ensures effective chip evacuation in deep holes.
• Entry Angle: Use a 90° entry surface or chamfer to avoid drill walk and ensure concentric start.
• Pre-Spotting: Recommended for 2.1 mm drills; use a 90° or 120° spot drill to create a precise pilot.
• Speed Ramp: Reduce spindle speed by 20% for the first 2 mm of engagement, then ramp to full Vc.
• Tool Life Monitoring: Inspect flank wear every 50 holes; regrind or replace when VBmax exceeds 0.15 mm.

Toolholder Compatibility

Packaging & Ordering Information

Catalog Meta Data

All specifications are subject to standard manufacturing tolerances. For application-specific recommendations, contact our technical support team with your workpiece material and machine details.