Page 65 - CITS - Fitter - Trade Theory

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1 Base: The bottom part of the height gauge that provides stability and support when measuring.
2 Vertical beam or column: This is the tall, vertical part of the gauge that rises from the base. It serves as a
reference for measurements and provides the structure for other components to slide up and down.
3 Vernier scale: The Vernier scale is a secondary scale that allows for highly precise readings. It is typically
found on a sliding jaw or carriage that moves along the vertical beam. The Vernier scale consists of evenly
spaced divisions that are slightly smaller than the main scale divisions. By aligning the Vernier scale with the
main scale, users can read measurements to fractions of the smallest scale division.
4 Main scale: The main scale is the primary scale marked along the vertical beam or column. It provides the
coarse measurement readings, usually in millimeters or inches, depending on the gauge.

5 Sliding jaw or carriage: This movable part holds the Vernier scale and can be adjusted up and down the
vertical beam to measure different heights.
6 Measuring jaw: The part of the sliding jaw or carriage that makes contact with the object being measured. It
typically has a flat surface for accurate height measurements.
7 Locking screw or clamp: A mechanism, often a screw or clamp, used to secure the sliding jaw or carriage in
place once the desired measurement is obtained.

8 Fine adjustment knob: Some Vernier height gauges have a fine adjustment knob to make precise adjustments
to the height without needing to release and reposition the sliding jaw.
9 Scriber: A pointed attachment or feature at the bottom of the height gauge used for marking or scribing lines
on the workpiece.
These parts work together to enable precise vertical measurements, making Vernier height gauges essential
tools in fields requiring accurate height measurements, such as machining, engineering, and quality control.
• Principle of vernier height gauge
The principle of a Vernier height gauge is based on using a Vernier scale to make precise measurements of vertical
distances or heights. The Vernier scale, which slides parallel to the main scale, allows for finer measurements by
aligning its divisions with those on the main scale. This alignment provides a more accurate reading than the main
scale alone, enabling high precision in height measurements.
• Specific use of vernier height gauge
A Vernier height gauge is specifically designed for accurately measuring vertical distances or heights with high
precision. Some specific uses of Vernier height gauges include:
1 Measuring the height of workpieces: In machining and manufacturing processes, Vernier height gauges are
commonly used to measure the height of components, parts, or workpieces with precision, ensuring they meet
required specifications.
2 Setting up machinery: Vernier height gauges are used to set up machinery and equipment to specific heights
or distances, ensuring precise alignment and operation.
3 Checking flatness and parallelism: These gauges can also be used to check the flatness and parallelism of
surfaces by measuring the height difference between multiple points on a surface.
4 Quality control: In quality control processes, Vernier height gauges are employed to verify the dimensions
and tolerances of manufactured parts, ensuring they meet quality standards.

5 Layout and marking: Vernier height gauges can be used for layout and marking purposes, such as scribing
lines or marking reference points at specific heights on workpieces.
Overall, Vernier height gauges are indispensable tools in various industries where accurate height measurements
are essential, such as machining, engineering, metalworking, woodworking, and quality control.
• Safety precautions while using vernier height gauge
When using a Vernier height gauge, it’s important to follow safety precautions to prevent accidents and ensure
accurate measurements. Here are some safety precautions to consider:

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CITS : CG & M - Fitter - Lesson 10