Dies – Different Types and Uses in ITI Turner Trade

In the ITI Turner trade, threading is an essential machining operation used to create screw threads on workpieces. While taps are used for internal threading, dies are used for cutting external threads on rods, bolts, and shafts. This chapter explains the different types of dies, their construction, materials, and uses in workshop practice.

Introduction to Dies

A die is a cutting tool used to produce external threads on cylindrical workpieces. It has internal cutting edges that shape the outer surface of the material into threads.

Dies are commonly used with a die stock (die holder) and are essential for making bolts, screws, and threaded rods.

Material Used for Dies

Dies are made from high-quality materials such as:

• High-speed steel (HSS)
• Carbon steel
• Alloy steel

These materials provide hardness, wear resistance, and durability required for cutting threads.

Construction of Dies

A die is usually circular in shape with internal threads and cutting edges. It consists of the following parts:

• Cutting Edges: Used for forming threads
• Flutes: Allow chip removal
• Outer Surface: Used for holding in die stock
• Adjusting Screws: Used in adjustable dies

Types of Dies

1. Solid Die

A solid die is a single-piece die with fixed size. It is simple and easy to use but cannot be adjusted.

• Used for standard thread cutting
• Provides accurate threads

2. Split Die (Adjustable Die)

A split die has a slit that allows slight adjustment of size. It is widely used in workshops.

• Adjustable for tight or loose threads
• Suitable for precision work

3. Die Nut

A die nut is used for repairing damaged threads rather than cutting new ones.

• Used for cleaning threads
• Not suitable for new threading

4. Adjustable Die

This type allows fine adjustment for thread accuracy. It is used in precision applications.

5. Button Die

A circular die used in die stocks. It is the most common type used in workshops.

Types of Threads Produced by Dies

Dies are used to produce different types of threads:

• Metric threads
• British Standard threads
• Unified threads

Uses of Dies

Dies are used in various workshop operations:

• Cutting external threads on rods and bolts
• Repairing damaged threads
• Producing screws and fasteners
• Maintaining thread accuracy

Method of Using Dies

Proper method ensures accurate threading:

• Select correct die size
• Fix the die in die stock
• Chamfer the end of the workpiece
• Apply cutting fluid
• Rotate die slowly and evenly
• Reverse slightly to break chips

Advantages of Dies

• Simple and easy to use
• Produces accurate threads
• Available in different sizes
• Suitable for various materials

Limitations

• Requires proper alignment
• Risk of damage if misused
• Limited to external threading

Precautions While Using Dies

To ensure safety and accuracy, the following precautions should be followed:

• Use correct die size
• Ensure proper alignment
• Apply cutting fluid
• Avoid excessive force
• Keep die clean and sharp

Maintenance of Dies

• Clean after use
• Store properly
• Apply oil to prevent rust
• Inspect for wear and damage

Application in Turner Workshop

In the Turner trade, dies are used for cutting threads on shafts, bolts, and machine components. They are also used for repairing damaged threads and ensuring proper fitting of parts.

Proper use of dies improves efficiency and quality in machining operations.

Conclusion

Dies are essential tools for external threading in the ITI Turner trade. Understanding their types, materials, and uses helps trainees perform threading operations accurately.

By following proper techniques and precautions, workers can achieve high-quality threads and ensure safety in the workshop.

In conclusion, mastering the use of dies is important for every Turner to produce precise and reliable threaded components.