Reamers – Types and Uses in ITI Turner Trade
In the ITI Turner trade, achieving accurate hole size and smooth surface finish is very important in machining operations. After drilling, the hole produced may not be perfectly accurate or smooth. To improve the accuracy and finish of the hole, a tool called a reamer is used. This chapter explains the types of reamers and their uses in detail.
Introduction to Reamer
A reamer is a multi-edge cutting tool used to slightly enlarge and finish an already drilled hole to a precise size and smooth surface. Reaming is a finishing operation and removes only a small amount of material.
Construction of Reamer
A reamer consists of the following parts:
- Shank: Held in the tool holder or chuck
- Body: Contains cutting edges
- Flutes: Grooves for chip removal
- Cutting Edges: Multiple edges for finishing
- Chamfer: Helps in easy entry into the hole
Types of Reamers
1. Hand Reamer
Hand reamers are used manually with a wrench.
- Long taper at the cutting end
- Suitable for manual operations
Uses
- Light finishing work
- Repair and maintenance
2. Machine Reamer
Machine reamers are used on machines such as lathe and drilling machines.
- Short chamfer
- Used at higher speed than hand reamer
Uses
- Production work
- Precision machining
3. Straight Fluted Reamer
Flutes are straight along the body.
Uses
- General purpose reaming
- Suitable for through holes
4. Spiral Fluted Reamer
Flutes are in spiral shape for better chip removal.
Uses
- Blind holes
- Better surface finish
5. Adjustable Reamer
The diameter can be adjusted slightly.
Uses
- Maintenance work
- When exact size is not fixed
6. Expansion Reamer
Used to compensate for wear by expanding slightly.
Uses
- Precision work
7. Shell Reamer
Mounted on an arbor.
Uses
- Large diameter holes
Uses of Reamers
- Finishing drilled holes
- Improving dimensional accuracy
- Producing smooth surface finish
- Ensuring proper fit of components
Advantages of Reaming
- High accuracy
- Better surface finish
- Improved hole quality
Limitations
- Removes small amount of material only
- Requires pre-drilled hole
Precautions While Using Reamers
- Use correct size reamer
- Maintain proper speed and feed
- Use cutting fluid
- Ensure proper alignment
Maintenance of Reamers
- Keep clean and sharp
- Store properly
- Avoid excessive force
Application in Turner Workshop
In the Turner trade, reamers are used to finish holes in workpieces after drilling. They help in achieving accurate size and smooth surface finish required for proper fitting of parts.
Reaming is commonly used in precision machining operations.
Difference Between Drilling and Reaming
- Drilling produces rough hole
- Reaming finishes and sizes the hole
Conclusion
Reamers are important finishing tools in the ITI Turner trade. Understanding their types and uses helps in achieving accurate and smooth holes.
Proper use of reamers improves quality and precision in machining operations.
In conclusion, mastering reaming operations is essential for producing high-quality components in engineering workshops.