Combination Set – Square Head, Center Head and Protractor Head – Construction, Function and Uses
In the ITI Turner trade, accurate measurement and marking are essential for producing high-quality components. The combination set is a versatile measuring and marking tool used in engineering workshops. It consists of different heads such as the square head, center head, and protractor head. This chapter explains their construction, functions, and uses in detail.
Introduction to Combination Set
A combination set is a precision tool consisting of a steel rule and interchangeable heads. It is used for measuring, marking, and checking angles and dimensions.
The main parts include:
- Steel rule
- Square head
- Center head
- Protractor head
Square Head
Construction
- Made of cast iron or steel
- Fixed at 90° and 45° angles
- Includes spirit level and scriber
- Adjustable along the rule
Function
- Checking right angles (90°)
- Checking 45° angles
- Measuring depth and height
Uses
- Marking perpendicular lines
- Checking squareness of surfaces
- Layout work
Center Head
Construction
- V-shaped head
- Fits on the steel rule
- Made of hardened steel
Function
- Locates the center of cylindrical objects
Uses
- Marking center lines on shafts
- Finding center of round bars
Protractor Head
Construction
- Graduated circular scale
- Adjustable blade
- Locking mechanism
Function
- Measuring angles
- Setting required angles
Uses
- Checking angular surfaces
- Marking angles
Advantages of Combination Set
- Versatile tool
- High accuracy
- Multiple functions in one instrument
Precautions
- Handle carefully
- Keep clean
- Avoid dropping
Maintenance
- Store in protective case
- Clean after use
- Apply light oil
Application in Turner Workshop
In the Turner trade, combination sets are used for marking, measuring, and checking angles and dimensions. They help in ensuring accuracy and quality in machining operations.
The square head is used for right angles, the center head for locating centers, and the protractor head for angle measurement.
Importance
- Improves accuracy
- Reduces errors
- Enhances productivity
Conclusion
The combination set is an essential tool in the ITI Turner trade. Its different heads provide multiple functions such as measuring angles, marking centers, and checking squareness.
Understanding its construction and uses helps trainees perform accurate measurement and layout work.
In conclusion, mastering the use of combination set is important for achieving precision and quality in engineering work.