OPERATING MACHINE OF NC/CNC BASICBASIC COMPETENCE : DESCRIBE JOB INSTRUCTIONS

LEARNING ACTIVITY 1Job Instruction in operating lathe CNC a. Learning ObjectivesAfter following the lesson, student expected to be able to:know the form and format of job instruction usedUnderstand the content of job instruction correctlydo job instruction according to procedure and standard job specifiedDo job instruction according to standard and procedure job specified

DESCRIBE JOB INSTRUCTIONJob 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 programChecking the correctness of program Checking the correctness of cutter trajectory Installing work objectPlacing cutter on early pathRun the program

ENTERING PROGRAM OF LATHE CNCEntering program of Lathe CNCEntering the program of lathe CNC manually using buttons

CHEKCING CORRECTNESS OF PROGRAMChecking Program CorrectnessInspection of mistyping, Ianguage and format of program done by running test program )c) Checking Correctness of CuttingTrajectoryInspection 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 installationPay attention to dot or area of datum installation of work piece

INSTALLING WORK PIECEInstalling Work Piece

PLACING CUTTING ON EARLY PATH Placing cutter on early pathPlacing cutter on early path have to follow specified distance on G 92)

Running programCutter movement during running program must get attention continuouslyStop running program by pushing button INP+FWD if there is worry thing

THE INSTRUCTION ORDER IN OPERATING CNC LATHE The instructions order in opertaing lathe CNC are:Entering programChecking program correctnessChecking correctness of cuttingtrajectoryInstalling work piece Placing cutter on early pathRunning program

SUMMARYc. Summary 1Job instruction is command of compiled job alternately to guide execution of jobJob sequence to operate lathe of CNC consist of sequential command as follow:Entering programChecking the correctness of program checking the correctness of cutter trajectorInstalling work objectPlacing cutter on early pathRun the program

Task 1

Take one of the program sheet. Try to enter manually into machine memoryDo running test program. If there is any mistyping or the other? If there is one. Repairing the mistake and do running test program againOtherwise, 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

FORMATIVE TEST

1. Job instructions are to: give job orderguide jobturn around jobAll 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

FORMATIVE TEST5. 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 error4. Well-applied job instruction can: prevent operation errorprevent product failureprevent negligence of operator )All answers are correct

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