i. The document provides instructions for a lab on CNC turning. Students will conduct programming and operate a CNC lathe to machine an aluminum rod. ii. Safety precautions for the lab are outlined. Students will then set up and operate the CNC lathe, including setting a reference point, editing programs, and simulating programs. iii. Drawing data and requirements are given to write a program to machine a part with specified dimensions from an aluminum rod. Students will complete the tasks of writing and running the program to machine the part.

1. POLITEKNIK SULTAN SALAHUDDIN ABDUL AZIZ SHAH
Mechanical Engineering Department
LAB SHEET
Programme Diploma Engineering in Mechanical
Course Code JJ503 : Mechanical Workshop Practices 4
Title CNC Turning
Lab. No. JJ503/JKM/L01.S01
SPECIFIC OBJECTIVE (SO):
Upon completion of this laboratory, students should be able to:
i. Conduct programming and operate CNC lathe machining works in actual or by simulation
ACTION NAME & DESIGNATION SIGNATURE DATE
Mohd Sharizan Mohd Sharif
Prepared by: 03/07/2012
Course Lecturer
Zulkhairi Khairudin
Checked by: 03/07/2012
Course Coordinator
Zalaida Talib
Approved by: 03/07/2012
Programme Leader
THEORY:
CNC Turning machines and conventional turning machines each have the same basic components, such as
the main motor, the spindle, the bed, the tool turret, the headstock, the cross-slide, the carriage and the way
systems. However, CNC Turning machines, in addition, are outfitted with a computerized control and
servomotors to operate them.
Manual CNC Turning can be very versatile and productive machine tools, but when coupled with
a CNC, they become the ‘high tech production turning machines’ of the machine shop. Additionally,
repetitive operations such as turning, facing and boring are ideal machining applications for CNC Turning
machines.
CNC Turning machines can also be designed to include a variety of optional components and
features. These options are basically designed to reduce setup time, part handling and cycle time. For
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2. instance, one option for minimizing part handling time is to add a part loading magazine or a robot arm.
The maximum spindle speed (RPM) of a CNC Turning machines can also vary depending on the need or
application.
The factors that determine the spindle speed range selected can include the type of part materials,
the part sizes and the annual part production quantities to be machined. Another factor that influences the
spindle speed range is the type of tool cutter material that will be used, such as HSS, coated carbide,
diamond and ceramic.
High-production turning machines can be designed with dual chucks that enable a part to be
machined on both ends. Also, live tooling can be incorporated that allows milling and drilling at various
angles. Other options may include a second or third turret, a bar feeder, a parts catcher, a steady rest
follower and a tool setter.
APPARATUS :
CNC Tuning Machine TNA300, Aluminium rod Ø19mm
SAFETY PRECAUTION:
There are several key factors to avoid or prevent any accident in the lab.
1. Work habits
2. Security self
3. Security when using the equipment
4. Housekeeping work
5. Focus attention and calm at work
6. Placing the cleanliness and neatness of dress
PROCEDURE:
A) CNC Turning Operating.  Select monitor.
 Switch on main  Press HI to program.
 On NC
 On pump E) Simulation.
 Select mode ‘ ON AUTO’
B) Setting Reference Point  Press M/C lock ( compulsory )
 Set feed rate to 10%  Press graphic
 Mode selection switch at reference point  Press H3 to trace
 Off pump  Press H5 to program
 Off NC (about 10 second)  Press start button
 Do again step A  Press ‘Dry Run’. ( base on program request )
 Increase feed override to …….
C) Edit File  Set rapid traverse to 25°.
 Select edit
 Choose file
 Select file – input
 Select monitor
 Press H2 to search file.
 Select file
 Press H2 (to active program to input )
D) Work Setting.
 Claim work piece
 Measure length work piece to …………( LW + 106)
 Select edit button
 Choose programming by press ……….. on screen
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3.  Go to G59 – change Z dimension. Total work piece + 106 = input………..
Drawing Data
T 0303 T 0404 T 1111
DATA REQUIRED FOR PROGRAM BUILD – UP
1. Program Number : O4433
4. Metal Working Data
Facing
Feed : 0.25 mm/min
2. Rough Part : Cont cutting rate : 250 mm/min
Speed limit : 2000 rpm
Diameter = 20mm
Roughing
Length = 50mm Feed 0.4 mm/min
Cont cutting rate 250 mm/min
Speed limit : 2000 rpm
3. Tools Parting off
Feed 0.10 mm/min
Cont cutting rate 300 mm/min
Speed limit : 2500 rpm
5. Work piece Zero Point : 200 mm
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4. TASK
1. Write the programming based on drawing information given
2. Key-in the programming to machine
3. Run the simulation on graphic profile
4. Run the machine to get the product
REFERENCES :
1. Bawa. (2004). Manufacturing Process 1. McGraw-Hill
2. Bawa. (2004). Manufacturing Process 2. McGraw-Hill
3. Che Abas Che Ismail (2000). Rekabentuk Pembuatan Terbantu Komputer. UTM
4. S.K. Krar,J.W.Oswald.(1976) Technology of Machine Tools. McGraw-Hill
EVALUATION :
NO ITEM MARKS (%)
1 Practical Task 60
2 Lab Report 40
Total Mark 100
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