Learn how CNMG inserts, correct insert angle, and M-type tool holders improve turning accuracy, stability, and cutting performance in workshop machines.

What Is a cnmg insert angle?

The cnmg insert angle is a carbide insert designed for turning with a rhombic shape. The "C" designation simply indicates an 80-degree diamond shape which provides good strength and versatility. The CNMG inserts has four cutting capabilities on each side and can be rotated to use on all four edges as needed. These cutting inserts are common for medium to heavy turning applications. 

CNMG inserts are utilized within a special tool holder, referred to as a tool holder extension suitability for this particular insert, that keeps the insert secured while cutting. If secured well, the insert remains rigid, which can help obtain a better surface finish and longer tooling life. 

Thecnmg insert tool holder angle is an important facet of the design of the insert. This angle helps determine how the insert ends the contact with the material being cut, and how stable the tool will remain during the cut.

What Does the CNMG Insert Angle Mean?

A lot of machinists wonder what the cnmg inserts angle really means. It mainly refers to the included angle of the insert shape, which is 80 degrees. This included angle makes the insert strong, especially at the corners, which is good for roughing operations.

But it also affects:

• Chip flow
  
  

• Cutting pressure
  
  

• Holder positioning
  
  

• Tool entry into the material
  
  

The specified angle allows the insert to correctly fit into M-type turning holders, which provides stable machining setup. Being knowledgeable about the cnmg insert angle allows the user to select the correct holder and setup to reduce the wear from turning.   

Understanding the MCLNR / MCLNL Turning Holder

The image you provided shows an MCLNR/L type turning holder. This is a standard M-type tool holder used with CNMG inserts.

Here is what each part of the name means:

• M → Clamping style (lever or clamp type)
  
  

• C → Insert shape (compatible with CNMG)
  
  

• L → Insert orientation (left or right mount)
  
  

• N → Insert clearance style
  
  

• R/L → Right-hand or Left-hand tool holder
  
  

These holders provide a strong clamping system and secure seating for the insert. They are designed to hold the insert at the correct cnmg inserts angle, ensuring smooth turning.

Important Spare Parts for M-Type Holders

Your image also shows commonly used spare parts for these holders. Understanding each part helps machinists maintain the tool holder for longer life.

1. Clamp HL1814

This clamp holds the insert tightly in the pocket. The clamp provides stability and makes sure the insert does not move during heavy cutting.

2. Clamp Screw ML0625

This screw fixes the clamp in place. It must be tightened correctly so that the insert stays stable.

3. Shim Pin CTM617

The shim pin supports the shim and keeps it in position. It helps maintain the correct height of the insert.

4. CNMG12 Shim (M Type)

The shim protects the tool holder from damage. If the insert breaks or chips, the shim absorbs the impact and saves the holder.

Together, these spare parts ensure the holder can support the insert safely at the correct cnmg insert angle.

Why Insert Angle and Holder Design Matter

The shape and geometry of a cnmg insert tools  work best only when the holder matches it. The correctness of the cnmg insert tool  in the holder helps in:

• Better cutting control
  
  

• Lower vibration
  
  

• Improved surface finish
  
  

• Longer tool life
  
  

• Better chip removal
  
  

If the angle is wrong or the insert is not fitted properly, the tool may vibrate, wear out faster, or even break.

That is why choosing the right MCLNR/L holder is very important.

Common CNMG Insert Sizes

CNMG inserts are available in various sizes depending on the job requirement. Some common sizes include:

• CNMG 1204 series — Popular for general turning
  
  

• CNMG 1606 series — Used for deeper cuts
  
  

• CNMG 1906 series — Used for heavy-duty industrial operations
  
  

Each size has specific thickness, length, and corner radius. Always check the insert and holder chart before buying. This avoids mismatch and ensures the insert sits correctly at the designed angle.

Matching sizes correctly helps maintain the correct cnmg insert tool  during machining.

How to Choose the Right Insert & Holder for Your Workshop

Here are some simple steps for choosing the right combination:

1. Check Insert Geometry

Make sure the insert is CNMG type. Only then it will fit into an MCLNR or MCLNL holder.

2. Confirm the Right Angle

Ensure the holder supports the factory-designed cnmg insert angle so the tool works smoothly.

3. Pick the Correct Holder Shank Size

Common shank sizes include 20 mm, 25 mm, and 32 mm. Choose based on your machine capacity.

4. Select the Correct Shim and Clamp

Using original spare parts improves cutting stability and increases insert life.

5. Choose the Right Grade

Different grades are available for steel, stainless steel, cast iron, and high-temperature alloys.

6. Buy From a Trusted Source

To avoid fake inserts and poor-quality holders, always buy from reliable suppliers.
Jaibros is a trusted place to find original CNMG inserts, M-type holders, and all matching spares.

Conclusion

M-type turning holders and CNMG inserts rank among the most popular tools used for both CNC and lathe operations. Understanding a tool insert and holder's geometry, spare parts, design, and angle of the cnmg insert tool  will provide machinists with higher performance, a smoother cut, and longer tool life. 

The right combination of holder, shim, clamp, and insert will allow any shop more accuracy and less tool failure. 

For original tool holders and CNMG inserts, Jaibros is a trusted source for machinists in India.

Frequently Asked Questions 

1. What does the CNMG insert angle mean?
It refers to the 80-degree included angle of the CNMG insert design.

2. What holder is used with CNMG inserts?
MCLNR or MCLNL holders are commonly used with CNMG inserts.

3. Why is a shim used under the insert?
The shim protects the holder and provides correct seating height.

4. What is the function of the clamp?
The clamp locks the insert firmly in the pocket during turning.

5. Can CNMG inserts be used for both roughing and finishing?
Yes, CNMG inserts are suitable for general, roughing, and semi-finishing work.