Page 75 - CITS - Fitter - Trade Theory

FITTER - CITS

• Parts of combination set
The primary components of a combination set typically include:

1 Steel rule: A straight ruler typically made of stainless steel, often with both metric and imperial (inch)
graduations. It serves as a basic measuring tool for linear distances.
2 Square head: A square-shaped component attached to the steel rule, used for marking or measuring right
angles. It allows for precise layout and checking of
Level vial: Some combination sets may include a small spirit level vial attached to the square head or
protractor head. This enables users to check for level or plumb surfaces, ensuring accuracy in layout and
construction tasks.
Scriber: A sharp pointed tool used for marking or scribing lines on various materials,
3 Center head: A center-finding attachment that can be attached to the steel rule. It helps locate the center
of cylindrical or round objects accurately, facilitating drilling or machining operations.
4 Protractor head: A protractor-like attachment used for measuring and setting angles. It allows for precise
angle measurements, often with graduations in degrees or minutes. such as metal or wood. It is often
included in combination sets to facilitate precise marking during layout work.

• Use of combination set
A combination set is a versatile tool that finds applications across a wide range of industries and professions. Here
are some common uses of a combination set:

1 Layout and marking: Combination sets are invaluable for laying out and marking precise measurements
on various materials such as wood, metal, or plastic. The square head allows for marking right angles and
perpendicular lines accurately, while the steel rule and scriber enable precise measurements and marking
of distances.
2 Setting angles: With the protractor head attachment, combination sets are used for measuring and setting
angles with high precision. This is particularly useful in carpentry, metalworking, and machining tasks where
accurate angles are crucial for proper fit and function of components.

3 Finding centers: The center head attachment in a combination set allows users to locate the center of
cylindrical or round objects accurately. This is essential for drilling holes, machining operations, or layout
work where symmetrical placement is required.
4 Checking for squareness: Combination sets are commonly used to verify the squareness of components,
assemblies, or structures. By using the square head, users can quickly check if corners are perfectly
square, ensuring proper alignment and fit.

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CITS : CG & M - Fitter - Lesson 10