1. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 1
1.1. Draw and label a schematic drawing of how you would check the
core diameter of an external V-thread.
1.2. Using ‘best’ wire sizes determine the distance of the wire for M
20 x 2.5 ISO metric thread.
1.3. Why is the three-wire method is one of the best method of
measuring the pitch diameter of a V thread?
1.4. With the aid of a labelled diagram, briefly explain how you
would use an optical comparator to check the thread angle of 60o

2. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 2
1. Calculate for a 36Tgear of 5 mm module and 20o pressure angle, (a)
plug size (b) distance over two plugs placed in opposite spaces, (c)
distance over two plug s spaced 10 teeth apart.
2. State three (3) characteristics of the following gears
i. helical gear
ii. spur gear
3. Sketch and name six (6) parts of a spur gear

3. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 3
1. Explain why present-day standards relating to surface texture are very
important to industry .
2. List and explain the types of defects found on surfaces.
3. Explain the following terms:
a) roughness
b) waviness
c) lay

4. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 4
SOALAN 1
In detail, what is the NC, CNC and the DNC.
SOALAN 2
List FIVE advantages and disadvantages of a computer numerical control
systems
SOALAN 3
Describe 3 method of controlling machine (CNC) below.
a) Machine tool
b) Machine control unit (MCU)
c) Control system
SOALAN 4
Write a program to cut the components as shown below using the G90 and G91.
30
J20
70
35
30
45
60

5. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 5
1. Explain the term nonconsumable electrode.
2. What does the term inert signify?
3. List the gases used for shielding a welding arc.
4. Explain how TIG welding electrodes are shaped.
5. How far should the electrode extend beyond the nozzle of the TIG
torch?
6. Explain why MIG welding is classified as a semiautomatic process.

6. JJ 204 TEKNOLOGI WORKSYOP 2 TUGASAN
TASK 6
1. Give an advantages and disadvantages of RP
2. Explain what the meaning of additive
3. Explain what the meaning of fused, stereo lithography, selective laser sintering, ballistic and
laminated
4. Describe every process for the Generic RP Process Sequence below,
CAD solid model
Model repair and modification
Produce STL file
Slicing the file
Final build file
Fabrication
Post processing
5. Explain rapid tooling uses.