LABORATORY TASK ASSESMENT JQD 22403 Title Reading of scaled instruments Topic Covered Chapter 3: Basic length and dimensional metrology Practical Hours 3 Hours CLO Related CLO 3: Perform measurement and calibration by using appropriate precision instruments and methods (P4) Objectives At the end of this practical task, the students shall be able to: Measure the reading of sample through micrometer, height gauge and bevel protractor Ability to select appropriate measurement dimension based on the equipment functionality Competence handle the equipments effectively and get the accurate result Main Resources Micrometer, Height Guage and Bevel Protractor Measured Object / Workpiece Overview Dimension is a numerical value expressed in appropriate units of measurement and used to define the size, location, orientation, form or other geometric characteristics of a part

Question

LABORATORY TASK ASSESMENT JQD 22403

Title

Reading of scaled instruments

Topic Covered

Chapter 3: Basic length and dimensional metrology

Practical Hours

3 Hours

CLO Related

CLO 3: Perform measurement and calibration by using appropriate precision instruments and methods

(P4)

Objectives

At the end of this practical task, the students shall be able to:

Measure the reading of sample through micrometer, height gauge and bevel protractor
Ability to select appropriate measurement dimension based on the equipment functionality
Competence handle the equipments effectively and get the accurate result

Main Resources

Micrometer, Height Guage and Bevel Protractor
Measured Object / Workpiece

Overview

Dimension is a numerical value expressed in appropriate units of measurement and used to define the size, location, orientation, form or other geometric characteristics of a part. In other words, indicating on a drawing, the sizes of the object and the other details essential for its construction and function using lines, numerals, symbols, notes, etc., is called dimensioning. There are few types of dimensions usually used which include linear dimension and angular dimension. Linear dimension is a measurement of the horizontal or vertical dimension of a feature. Linear dimensions may not represent the true distance between beginning and ending dimension points because they do not take angle into account as aligned dimensions. Angular dimensions annotate the angle measured between two lines, two linear segments of a polyline or the angle of a circular arc. This practical task will covered measurement of both dimension.

General Instructions

This practical task conducted by paired.
As for general guide, you should refer to the instruction manual or instruction given by the lecturer of the specified instruments for the general procedures and measurement methods.
Each student need to submit the Laboratory Task Sheet within ONE week upon completion of the practical

tasks

Task 1.1: External Micrometer Reading (10 Marks)

No	Activities
1	Determine the measuring scale reading of external micrometer (range 25 ~ 50mm) with measuring resolution 0.01mm as shown in Figure 1.

	Figure 1 Answer:
2	Determine the measuring scale reading of external micrometer (range 25 ~ 50mm) with measuring resolution 0.01mm as shown in Figure 2.


	Figure 2 Answer:

3

Determine the measuring scale reading of external micrometer (range 25 ~ 50mm) with measuring resolution 0.05mm as shown in Figure 3.

Figure 3 Answer:

4

Determine the measuring scale reading of external micrometer (range 25 ~ 50mm) with measuring resolution 0.01mm as shown in Figure 4.

Figure 4. Answer:

5

Determine the measuring scale reading of external micrometer (range 25 ~ 50mm) with measuring resolution 0.01mm as shown in Figure7.

Figure7. Answer:

6

Use external micrometer with measuring resolution of 0.001mm to determine read off measurement ’12.723 mm’. Indicate the measuring scale reading by drawing or sketching. You’re using micrometer with measuring range of 0~25 mm

Answer:

7

Use external micrometer with measuring resolution of 0.001mm to determine read off measurement ’12.723 mm’. Indicate the measuring scale reading by drawing or sketching. You’re using micrometer with measuring range of 0~25 mm

Answer:

8

Use external micrometer with measuring resolution of 0.001mm to determine read off measurement ’41.726 mm’. Indicate the measuring scale reading by drawing or sketching. You’re using micrometer with measuring range of 25 ~50 mm

Answer:

9

Use external micrometer with measuring resolution of 0.002mm to determine read off measurement ’28.324 mm’. Indicate the measuring scale reading by drawing or sketching. You’re using micrometer with measuring range of 25 ~50 mm

Answer:

10

Use external micrometer with measuring resolution of 0.002mm to determine read off measurement ’21.842 mm’. Indicate the measuring scale reading by drawing or sketching. You’re using micrometer with measuring range of 25 ~50 mm

Answer:

Task 1.2: Universal Bevel Protractor Reading (10 Marks)

No

Activities

1

Determine the measuring scale reading of bevel protractor as shown in Figure 1

Figure 1

Answer:

2

Determine the measuring scale reading of bevel protactor as shown in Figure 2

Answer:

3

Determine the measuring scale reading of dial calliper as shown in Figure 3

Figure 3 Answer:

4

Determine the measuring scale reading of dial calliper as shown in Figure 4

Answer:

5

Determine the measuring scale reading of dial calliper as shown in Figure 5

Figure 5 Answer:

6

Determine the measuring scale reading of dial calliper as shown in Figure 6

Answer:

7

Determine the measuring scale reading of dial calliper as shown in Figure 7

Answer:

8

Use bevel protractor with measuring resolution of 5’ to determine read off measurement 88⁰ 35’. Indicate the measuring scale reading by drawing or sketching.

Answer:

9

Use bevel protractor with measuring resolution of 5’ to determine read off measurement 23⁰ 15’. Indicate the measuring scale reading by drawing or sketching

Answer:

10

Use bevel protractor with measuring resolution of 5’ to determine read off measurement 76⁰ 40’. Indicate the measuring scale reading by drawing or sketching

Answer:

Task 2: Equipment Competency (30 Marks)

Equipment Preparation

The equipment shall be checked for signs of damaged before measurement. Damaged equipment should not be used.
Clean the measuring surface of equipment, and work pieces with some Ethanol and paper tissue.
Check the zero reading.

Set-up and preparation

Each student need to select work pieces or specimens for the measurement which can be measured based on the equipment mention in table 1.
Repeat the measurement FIVE time for each dimension.
Fill in the reading as per example in table 1.

Table 1: Reading of Dimension Measured

Dimension	Equipment	Reading 1	Reading 2	Reading 3	Reading 4	Reading 5	Average	Standard Deviation
Step/Level 1	Height Guage (Standard)
Step/Level 1	Height Guage (Digital)
Step/Level 2	Height Guage (Standard)
Step/Level 2	Height Guage (Digital)
Step/Level 3	Height Guage (Standard)
Step/Level 4	Height Guage (Standard)
Step/Level 5	Height Guage (Standard)
Angle 1	Bevel Protractor
Angle 2	Bevel Protractor
Angle 3	Bevel Protractor

Calculate the average and standard deviation for measurement reading. (9 Marks)
Prepare a report which consist of:

1. Picture of the reading of each measurement by the height guage and bevel protractor.
2. Discussion on procedure prior conducting the measurement, while doing the measurement and after conducting the measurement. (3 Marks)
3. Discussion on the problem encounter and error while conducting the measurement. (3

Marks)

1. Discussion on the solution or precautions to avoid the error from happen. (3 Marks)
2. Discuss the accuracy, resolution and consistency of each measurement (height guage and bevel protractor) equipment based on the data collected. (6 Marks)
3. Compare the accuracy and consistency of measurement between digital height guage and standard height guage. (6 Marks)