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

Prepared by:Mohd Sharizan Mohd Sharif

Course Lecturer03/07/2012

Checked by:Zulkhairi KhairudinCourse Coordinator

03/07/2012

Approved by:Zalaida Talib

Programme Leader03/07/2012

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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POLITEKNIK SULTAN SALAHUDDIN ABDUL AZIZ SHAHMechanical Engineering Department

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 habits2. Security self3. Security when using the equipment4. Housekeeping work5. Focus attention and calm at work6. Placing the cleanliness and neatness of dress

PROCEDURE:

A) CNC Turning Operating. Switch on main On NC On pump

B) Setting Reference Point Set feed rate to 10% Mode selection switch at reference point Off pump Off NC (about 10 second) Do again step A

C) Edit File 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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Select monitor. Press HI to program.

E) Simulation. Select mode ‘ ON AUTO’ Press M/C lock ( compulsory ) Press graphic Press H3 to trace Press H5 to program Press start button Press ‘Dry Run’. ( base on program

request ) Increase feed override to ……. Set rapid traverse to 25.

Go to G59 – change Z dimension. Total work piece + 106 = input………..Drawing Data

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DATA REQUIRED FOR PROGRAM BUILD – UP 1. Program Number : O4433

2. Rough Part : Diameter = 20mmLength = 50mm

3. ToolsFacing : T0303Roughing : T0303Parting off : T1111

4. Metal Working DataFacing

Feed : 0.25 mm/minCont cutting rate : 250 mm/minSpeed limit : 2000 rpm

RoughingFeed 0.4 mm/minCont cutting rate 250 mm/minSpeed limit : 2000 rpm

Parting offFeed 0.10 mm/minCont cutting rate 300 mm/minSpeed limit : 2500 rpm

5. Work piece Zero Point : 200 mm

T 0303 T 0404 T 1111

TASK

1. Write the programming based on drawing information given2. Key-in the programming to machine3. Run the simulation on graphic profile4. Run the machine to get the product

REFERENCES :

1. Bawa. (2004). Manufacturing Process 1. McGraw-Hill2. Bawa. (2004). Manufacturing Process 2. McGraw-Hill3. Che Abas Che Ismail (2000). Rekabentuk Pembuatan Terbantu Komputer. UTM4. 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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