Kyocera VNBR0311-003NB KW10 TWE07066 Micro Boring Bar - Micro Boring
- Stock: In Stock
- Model: VNBR
- Weight: 0.05kg
- Manufactured: In Japan
- Ships: Worldwide
- Item Code: TWE07066
Kyocera VNBR 0311003NB KW10 Grade Uncoated Carbide, Micro Boring Bar
Product Overview
The Kyocera VNBR0311-003NB is a KW10-grade uncoated carbide micro boring insert (NB — no chipbreaker) designed for precision micro boring. Manufactured in Japan under ISO 9001:2015 quality standards, this insert combines an ultra-fine grain substrate with precision-ground geometry to deliver premium surface finish, reliable chip management, and enhanced wear resistance in small-diameter internal machining.
Engineered for right-hand applications in bores down to 0.1181", the VNBR0311-003NB features a 35° rhombic shape with 0° clearance, optimized for low cutting forces and minimal deflection in slender boring bars. Each insert provides 1 precision cutting edge for consistent bore quality.
ISO Designation Breakdown
| ISO Designation Breakdown — VNBR0311-003NB | |
|---|---|
| V | V-type 35° rhombic insert shape |
| N | 0° clearance angle (neutral, double-sided capable) |
| B | B-type tolerance class for micro-boring precision |
| R | Right-hand orientation for internal boring |
| 03 | Insert size designation: 03 mm nominal |
| 11 | Bore reference: 11 relates to minimum bore capacity |
| 003 | Nose radius: 0.003" (0.08 mm) |
| NB | NB (No Chipbreaker) |
Engineering Dimensions & Geometry
| Engineering Dimensions & Geometry | |
|---|---|
| Insert Size (Nominal) | 03 mm |
| Nose Radius | 0.003" |
| Insert Thickness | 0.08" |
| Included Angle | 35° (rhombic) |
| Clearance Angle | 0° (neutral) |
| Minimum Bore Diameter | 0.1181" |
| Number of Edges | 1 |
| Hand | Right-Hand |
Grade Details — Key Grade Characteristics
| Grade Details — KW10 Key Characteristics | |
|---|---|
| Carbide Substrate | Ultra-fine grain tungsten carbide (0.5 μm grain size) |
| Cobalt Binder | 6% Co content for optimal toughness balance |
| Hardness | 92.5 HRA (≈ 1600 HV30) |
| Transverse Rupture Strength | 3,200 MPa |
| ISO Classification | K10 (ISO 513) |
| Coating | Uncoated (bare substrate for maximum sharpness) |
| Color Code | Gray (uncoated) |
Grade Comparison Matrix
| Grade | ISO | Hardness | Best For | Coating |
|---|---|---|---|---|
| KW10 | K10 | 92.5 HRA | Cast iron, non-ferrous, Ti alloys | Uncoated |
| KW20 | K20 | 91.0 HRA | Interrupted cuts, roughing | Uncoated |
| PR660 | P15-P25 | 92.0 HRA | Steel, stainless steel | PVD |
| CA510 | P10-P20 | 93.0 HRA | Hardened steel, finishing | CVD |
Chipbreaker Profile
| Chipbreaker Profile Analysis | |
|---|---|
| Profile Designation | NB — No chipbreaker (flat top) |
| Geometric Description | Flat top face with no chipbreaker groove — designed for ultra-finish boring where chip control is managed by parameters |
| Rake Angle | Neutral 0° (flat top) |
| Chip Groove Depth | N/A (no groove) |
| Edge Preparation | Sharp edge with 0.01 mm hone |
| Intended Chip Form | Continuous ribbon — controlled by feed and DOC |
Recommended Applications & Workpiece Materials
The SWIQ series micro boring insert is engineered for precision internal turning in small-diameter bores. The KW10 grade delivers premium surface finish in bores as small as 0.1181".
- Cast Iron: Grey cast iron (FC250, FC300) — stable boring with excellent dimensional control
- Non-Ferrous Metals: Aluminum alloys, brass, copper — superior surface finish in micro-bores
- Titanium Alloys: Ti-6Al-4V — low cutting forces minimize deflection in slender boring bars
- Hardened Steels: Up to 45 HRC — precision sizing and finishing operations
Application Map by Operation
| Operation | Suitability | Remarks |
|---|---|---|
| Internal Boring | ★★★★★ | Primary — minimum bore 0.1181" |
| Internal Turning | ★★★★★ | Excellent for finishing bores |
| Internal Profiling | ★★★★☆ | 35° nose angle allows contouring |
| External Turning | ★☆☆☆☆ | Not recommended — internal use only |
| Grooving | ★☆☆☆☆ | Not designed for groove geometry |
Recommended Cutting Conditions
Parameters below serve as starting points. Optimize based on machine rigidity, coolant delivery, and workpiece condition:
| Material | Vc (m/min) | f (mm/rev) | ap (mm) | Coolant |
|---|---|---|---|---|
| Grey Cast Iron | 60–100 | 0.03–0.08 | 0.1–0.5 | Dry / Compressed air |
| Aluminum Alloy | 120–250 | 0.02–0.06 | 0.1–0.4 | Water-soluble / MQL |
| Brass / Bronze | 80–150 | 0.03–0.07 | 0.1–0.4 | Dry preferred |
| Titanium Alloy | 15–30 | 0.01–0.04 | 0.05–0.3 | High-pressure coolant |
Operating Guidelines
- Tool Setup: Ensure boring bar center height is exactly on spindle centerline (±0.01 mm). Below-center causes rubbing; above-center increases rake and risk of dig-in.
- Edge Inspection: Visually inspect insert cutting edge under 20× magnification before installation. In micro-boring, even 0.01 mm edge damage affects surface finish.
- Bore Preparation: Pre-drill or pre-bore to within 0.3 mm of final size. Leave consistent stock for the VNBR0311-003NB to remove in one or two passes.
- Coolant Strategy: For cast iron and brass, dry machining is preferred. For titanium and stainless, apply high-pressure coolant through the tool if available.
- Speed Ramping: Start at 60% of recommended Vc for the first 3 bores to verify stability, then increase to 100%.
- Insert Indexing: In micro-boring, replace insert when surface finish degrades or bore tolerance exceeds 50% of limit — do not wait for visible flank wear.
- Storage: Store inserts in original packaging. Handle with clean gloves to prevent oil/contamination on the precision ground seating surface.
Toolholder Compatibility
| Holder Series | Insert Size | Holder Type | Clamp System |
|---|---|---|---|
| SWIQ-03 | 03 mm | Swiss IQ micro boring bar | Screw clamp + pin |
| SVNR-03 | 03 mm | Standard internal turning bar | Lever lock |
| SSVNR-03 | 03 mm | Screw-clamp internal holder | Screw clamp |
Mounting Notes: For micro-boring, use a torque screwdriver set to 0.8 N·m. Over-torquing deforms the precision pocket. Verify insert seats flush with no visible gap.
Packaging & Ordering Information
| Packaging & Ordering Information | |
|---|---|
| Standard Pack Quantity | 10 inserts per plastic dispenser box |
| Bulk Pack Quantity | 100 inserts (10 boxes) per master carton |
| Individual Labeling | Each insert laser-marked with VNBR0311-003NB and batch code |
| Shelf Life | Indefinite when stored in original packaging (dry environment) |
| Minimum Order | 1 box (10 inserts) |
| MPN for Ordering | TWE07066 |
| Country of Origin | Japan |
Catalog Meta Data
| Catalog Meta Data | |
|---|---|
| Product Family | Kyocera Precision Tools — Indexable Inserts |
| Series Code | SWIQ |
| Style Code | VNB |
| E-Commerce SKU | TWE07066 |
| Last Catalog Update | 2026-Q2 |
| Regulatory Compliance | RoHS 3, REACH, ISO 9001:2015 manufacturing |
| Warranty | Standard Kyocera manufacturer warranty against material and workmanship defects |
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