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FITTER - CITS

When the zero of the Vernier scale coincides with the zero of the main scale, the first division of the Vernier scale
will be very close to the 2nd main scale division.
Hence, LC = 2MSD – 1VSD
LC =2°=24/12 – 23°/12
=1°/12 Or 5’.
• Reading of vernier bevel protector

To read a Vernier bevel protractor, follow these steps:
1 Align the protractor: Place the protractor on the surface or edge whose angle you want to measure. Ensure
it sits flat and stable.
2 Identify the main scale: Locate the main scale, which typically consists of a semi- circle marked with angular
divisions, usually in degrees. Note the zero mark on the main scale, which represents the starting point for
angle measurement.
3 Locate the vernier scale: Look for the Vernier scale, which is a secondary scale adjacent to the main scale.
It consists of smaller divisions compared to the main scale.
4 Align the zeroes: Ensure that the zero mark on the Vernier scale aligns with a mark on the main scale. This
ensures proper calibration for accurate readings.

5 Read the main scale: Identify the main scale reading by noting the closest division to the left of the zero mark
on the Vernier scale. This represents the whole number of degrees.
6 Read the vernier scale: Determine which mark on the Vernier scale aligns perfectly with a mark on the main
scale. The value of this Vernier mark represents the fraction of a degree.
7 Combine the readings: Add the main scale reading to the Vernier scale reading to obtain the final angle
measurement. Ensure to include the correct sign (positive or negative) depending on the direction of the angle.
8 Record the measurement: Note down the angle measurement obtained from the Vernier bevel protractor.
By following these steps, you can accurately read angles using a Vernier bevel protractor, ensuring precise
measurements for various applications in engineering, woodworking, metalworking, and other fields.

Combination set

Introduction to Combination Set
A combination set is a versatile tool used in various fields such as engineering, woodworking, metalworking, and
construction. It consists of several precision measurement tools combined into a single set, providing users with
a comprehensive solution for layout, measurement, and inspection tasks.
Combination sets are valued for their versatility and convenience, as they consolidate multiple essential
measurement and layout tools into a single compact kit. With a combination set, users can perform a wide
range of tasks, including marking out angles, finding centers, checking squareness, and ensuring level or plumb
surfaces. Whether in a workshop, on a construction site, or in a manufacturing facility, the combination set remains
an indispensable tool for achieving precision and accuracy in various applications.

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CITS : CG & M - Fitter - Lesson 10 CITS : CG & M - Fitter - Lesson 10