1. OPERATING MACHINE OF NC/CNC BASIC
BASIC COMPETENCE : DESCRIBE JOB INSTRUCTIONS

2. Job Instruction in operating lathe CNC
LEARNING ACTIVITY 1
Job Instruction in operating lathe CNC
a. Learning Objectives
After following the lesson, student expected to be able to:
know the form and format of job instruction used
Understand the content of job instruction correctly
do job instruction according to procedure and standard job specified
Do job instruction according to standard and procedure job specified

3. DESCRIBE JOB INSTRUCTION
Job instruction is command of compiled job alternately to guide execution of job
Job sequence to operate lathe of CNC consist of sequential command as follow:
Entering program
Checking the correctness of program
Checking the correctness of cutter trajectory
Installing work object
Placing cutter on early path
Run the program

4. ENTERING PROGRAM OF LATHE CNC
Entering the program of lathe CNC manually using buttons

5. CHEKCING CORRECTNESS OF PROGRAM
Checking Program Correctness
Inspection of mistyping, Ianguage and format of program done by running test program )
c) Checking Correctness of CuttingTrajectory
Inspection of movement type and chisel direction using
cutting trajectory test )
Tide Pentograf to know cutting trajectory)
Installing work piece
Installation of work piece done according to standard installation
Pay attention to dot or area of datum installation of work piece

6. INSTALLING WORK PIECE
Installing Work Piece

7. PLACING CUTTING ON EARLY PATH
Placing cutter on early path
Placing cutter on early path have to follow specified distance on G 92)
Running program
Cutter movement during running program must get attention continuously
Stop running program by pushing button INP”+”FWD” if there is worry thing

8. THE INSTRUCTION ORDER IN OPERATING CNC LATHE
The instructions order in opertaing lathe CNC are:
Entering program
Checking program correctness
Checking correctness of cuttingtrajectory
Installing work piece
Placing cutter on early path
Running program

9. SUMMARY
c. Summary 1
Job instruction is command of compiled job alternately to guide execution of job
Job sequence to operate lathe of CNC consist of sequential command as follow:
Entering program
Checking the correctness of program
checking the correctness of cutter trajector
Installing work object
Placing cutter on early path
Run the program

10. Task 1
Take one of the program sheet. Try to enter manually into machine memory
Do running test program. If there is any mistyping or the other?
If there is one. Repairing the mistake and do running test program again
Otherwise, if there is no mistake, do cutter trajectory tes. Use ploter or pantograph to detect cutter motion. Is there any motion direction / cutter trajectory which not ought to

11. FORMATIVE TEST 1. Job instructions are to: give job order guide job
turn around job
All the answers are correct
2. Job instruction must
a. brief and detail c. aplicable
b. well-understood d. All correct
3. Job instructions follow:
a. Instruction order c. Machinery process order
b. Program order d. all correct

12. FORMATIVE TEST 4. Well-applied job instruction can:
prevent operation error
prevent product failure
prevent negligence of operator )
All answers are correct
5. Every instruction should be equipped with:
a. product standard quality
b. machine operating condition
c. job condition
d. all answers are correct
6. Job instruction useful for
a. prevent process error
b. prevent trouble
c. prevent dangerous thing
d. prevent error