MTENN Neutraldrehhalter | 60° Einführwinkel für TNMG-Einsätze

Overview The MTENN series is a specialized Neutral External Turning Holder designed for versatility and precision. Unlike standard right or left-hand tools, the MTENN features a symmetric design with a 60° entering angle. This geometry makes it an excellent choice for CNC profiling, copy turning, and operations requiring bidirectional cutting capabilities or specific clearance angles.

Economy & Performance (TNMG Inserts) Optimized for TNMG insert tool holder applications, this tool utilizes triangular negative inserts.

• 6 Cutting Edges: The triangular shape offers 6 usable cutting edges per insert (3 per side), providing a highly economical cost-per-edge solution.

• Insert Variety: Fully compatible with TNMG (Chipbreaker), TNMA (Flat Top for Cast Iron), and TNMM (Roughing) inserts.

• Access: The 60-degree angle allows for better access into tight corners and reliefs compared to square insert holders.

Rigid M-Type Double Clamping Profiling operations often involve varying cutting forces. The MTENN is equipped with the industry-standard M-Type Double Clamping System. The combination of a locking pin and a heavy-duty top clamp ensures the insert remains securely seated in the pocket, preventing vibration even when changing cutting directions.

The 5-Letter Prefix: Geometry & Clamping

The first five letters define the “personality” of the tool holder.

The Numerical Suffix: Physical Dimensions

Following the letters (e.g., 2020K16), you will find numbers that describe the physical shank and the insert size it accommodates.

Shank Cross-Section (2020)

• 20: Shank Height ($20\text{ mm}$)

• 20: Shank Width ($20\text{ mm}$)

Tool Length (K)

The letter in the 8th position represents the total length of the holder.

• K: 125mm

• P: 170mm

• M: 150 mm

Cutting Edge Length (16)

The last two digits indicate the size of the insert.

• 16: Designed for an insert with a 16mm cutting edge (e.g., TNMG 160408).

Why Choose the MTENN System?

The MTENN holder is a “workhorse” in CNC shops for several reasons:

1. Extreme Rigidity: The “M” (Multi-lock) clamping prevents the insert from shifting under heavy lateral loads.

2. Vielseitigkeit: Being a Neutral (N) tool, it is often used for profiling or in setups where a single tool must perform multiple orientations.

3. Economy: By using Triangular (T) negative inserts, you get the maximum number of usable edges per dollar spent.

Profi-Tipp: Always ensure that the 4th letter of your holder (Clearance Angle) matches the 2nd letter of your insert. For an MTENN holder, you must use an insert with an N in the second position (like TNMG).

Q1: What is the main advantage of a “Neutral” (MTENN) holder?
A: A Neutral turning tool is symmetric. It allows for unique setups where the tool needs to approach the workpiece perpendicular to the axis, or for specific profiling operations where clearance is needed on both sides of the tool nose.

Q2: Can I use TNMA inserts on this holder?
A: Yes. The MTENN is compatible with TNMG, TNMA, and TNMM inserts. Using TNMA inserts (flat top) makes this holder excellent for machining cast iron, while TNMG is preferred for steel and stainless steel.

Q3: Is the triangular insert (TNMG) better than the square (SNMG)?
A: It depends on the application. The TNMG insert has a 60° point angle, which is weaker than the 90° square insert (SNMG) but offers better accessibility for profiling and undercuts. It also offers 6 cutting edges, making it very cost-effective.

Q4: What is the entering angle of MTENN?
A: The MTENN features a 60° Entering Angle (often referred to as a 30° Lead Angle in some regions). This geometry balances radial and axial cutting forces differently than a standard 95° tool, making it suitable for heavy cuts if the part setup allows.