Tungaloy Positive Turning Inserts Collection
Low Cutting Force | High-Precision Finishing | Professional CNC Solutions
Which positive insert is best for minimizing vibration and achieving high-precision internal bores?
The Tungaloy Positive Turning Insert series is engineered for applications where reducing cutting resistance is critical. Unlike negative inserts, positive geometries (7° or 5° relief angles) feature a sharp cutting edge that "slices" through material rather than pushing it. This makes them the industry standard for internal boring, machining slender workpieces, and achieving superior surface finishes on low-rigidity machines. This collection includes all major ISO shapes—CCMT, DCMT, VBMT, TCMT, and SCMT—available in Tungaloy’s world-class NS9530 Cermet for mirror finishes and T9200 Premium Carbide for high-speed steel turning.
Understanding Positive Insert Nomenclature
C/D/V/T
Shape
C / P
7°/11° Relief
M / G
Tolerance
T / W
Hole/Fixing
09/11/16
Size
03/04
Thickness
04/08
Radius
Anti-Vibration Geometry
The positive relief angle drastically reduces radial forces, preventing chatter and "singing" during deep internal boring operations.
NS9530 Gloss Technology
Our Cermet grade remains chemically inert at high temperatures, preventing metal adhesion and ensuring a glossy finish on steel workpieces.
Premium Chipbreakers
From the -PF for fine finishing to -PS for general light-medium turning, these breakers ensure short, manageable chips even in "stringy" materials.
Cross-Reference: Metric vs. Imperial Models
| ISO Metric |
ANSI Imperial |
Nose Radius |
Primary Use |
| CCMT 09T304 |
CCMT 32.51 |
0.4 mm |
80° General Turning |
| DCMT 11T308 |
DCMT 32.52 |
0.8 mm |
55° Profiling |
| VBMT 160404 |
VBMT 331 |
0.4 mm |
35° Deep Profiling |
Starting Cutting Data (Steel P)
| Finishing (Cermet) |
Vc: 150 - 450 m/min | f: 0.05 - 0.20 mm/rev |
| Medium (Carbide) |
Vc: 120 - 320 m/min | f: 0.10 - 0.30 mm/rev |
Matching Boring Bars & Tool Holders
Applications
- Precision internal boring and step machining.
- Machining of small-diameter shafts and delicate components.
- High-speed finishing of carbon steel, alloy steel, and stainless.
- Great for Swiss-type lathes and automatic CNC centers.
Compatibility
Universal ISO standard fit for all brand tool holders. Optimized for performance on high-end machines including Mazak, Haas, Okuma, and DMG Mori.
Tungaloy Material Grade Guide
| Grade |
Type |
Benefit |
| NS9530 |
Cermet |
Unrivaled Surface Finish (Mirror) |
| T9215 |
CVD Carbide |
Extreme Wear Resistance for Steel |
| AH725 |
PVD Carbide |
High Toughness for Interrupted Cuts |
Why Partner With Beyond CNC?
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Direct Tungaloy Supply
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Industry Experts
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Voice of the Machinist
⭐⭐⭐⭐⭐ "Solved my chatter problems" - Mark S., USA
"Was struggling with vibration on a 12" deep bore. Switched to Tungaloy DCMT positive inserts and the finish came out like glass. Beyond CNC delivered overnight."
⭐⭐⭐⭐⭐ "Genuine Quality" - Hans B., Germany
"Verified original Tungaloy stock. The NS9530 grade is the best cermet I have ever used for stainless finishing."
⭐⭐⭐⭐ "Great price for Tungaloy" - G. Russo, Italy
"Hard to find these prices in Europe for authentic Japanese inserts. Very happy with the CCMT collection."
Technical FAQ
Q: Why should I choose positive inserts over negative ones?
A: Positive inserts require less machine horsepower and produce lower cutting forces. They are essential for thin-walled parts and internal boring where deflection is an issue.
Q: What is the difference between 7° (C) and 11° (P) relief angles?
A: 7° is the standard for most turning. 11° provides even more clearance, often used for very small internal bores or soft materials like aluminum.
Q: Can these be used on Stainless Steel?
A: Yes. Use the **AH series** PVD grades or **PC series** for the best performance in stainless to prevent work hardening.
Industrial Tip: Extension Ratios
When boring with **Positive Inserts**, keep your boring bar overhang within **3-4 times the diameter** for steel shanks. If you must go deeper, ensure you use a carbide-reinforced bar to maintain precision. **BEYOND CNC** - Engineering Excellence.
© Technical Specification by Beyond Li - CNC Tooling Technical Director
