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

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

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

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

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

INSTALLING WORK PIECE Installing Work Piece

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

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

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

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

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

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