CNC MACHINIST / MILLER
Name of Sector Production & Manufacturing Name of Module CNC Milling
Minimum Age 18 Years Duration of Course 6 Months
ADU Code MAN704

Degree in Mechanical Engineering with one year Experience

(OR)

Diploma in Mechanical Engineering with two year Experience

(OR)

NTC/ NAC in Turner Trade with three years of Experience



TERMINAL COMPETENCY: The successful candidate would be able to:

Identify CNC Machining Centre Machine Elements.

Know the CNC control panel keys and Menu structure.

Start the CNC Machine and Reference it and move the Machine Slides (Axes) in JOG/INC/MPG Modes.

Start Spindle ON/OFF, Coolant On/Off, Tool Changing and do axes positioning in JOG/MDI Modes.

Load Parts in Work holding devices and Tools in tools Magazine/ATC & Spindle.

Input/edit Part Programs in the CNC Control and do Graphic Simulation to Verify/Check Part Programs.

Do Machining operations like Face Milling, End Milling, Pocket Milling, Drilling, Boring and Tapping using Automatic / Memory Modes with block search and Repositioning/Restart procedure.



Practical Competencies Underpinning Knowledge (Theory)

OSH & Safety Practices: (10 hours)

  • Fire Fighting in workplace & Precautions
  • General Safety of Tools & Equipments
  • Awareness on OSH related to the job


  • Fire Extinguishers & its Types
  • Safely handling Tools & Equipments
  • Use of proper Tools & Equipments & its maintenance
  • OSH & practices to be observed as a precaution

Personnel & Material Safety: (10 hours)

  • Select, use, clean and store personal safety protective equipment.
  • Use and store of materials in a safe manner.
  • Demonstrate the use of safety devices on metal cutting machines.
  • 5S concepts


  • State the safety precaution specific to turning on the lathe.
  • Safety related to handling of materials.
  • Safety devices used for safe machining.

Milling m/c & Tool specification: (40 hours)

  • Operation of milling machines
  • Tools, general cleaning and maintenance and safe storage of tools applicable to workshop tasks.
  • Identifying different types of cutter used in Horizontal milling machine.
  • Identifying different types of cutter used in Vertical milling machine
  • Identifying different parts of Horizontal milling machine and importance of each part.
  • Identifying different parts of Vertical milling machine and importance of each part


  • Introduction to milling, description, types of milling m/c - constructional features and functions.
  • Types of milling tools and their uses.
  • Classification & properties of tool materials & selection criteria. ISO specification on carbide tools.
  • Horizontal milling machine
  • Vertical milling machine
  • Horizontal milling operations- milling of flat surfaces, Gang and straddle milling, production of narrow slots, slotting and slitting of thin plates, key way cutting etc.
  • Describe vertical milling operations-milling of sunk and recessed surfaces,woodruff cutters, use of shell end mills, face mills, face slot cutters, dovetail cutters etc.

Job Holding & Centering: (40 hours)

  • Job holding devices on metal cutting machines & safety precautions.
  • Study of process planning sheet
  • Practice on leveling the job.
  • Tool holding devices and setting the same.


  • Different job holding devices in turning.
  • Describe the basic method of Work holding devices - three jaw chuck, four jaw chuck, face plate, collect chuck etc.
  • Describe the basic methods of supporting work – fixed steady, traveling steady.

Measuring job: (40 hours)

  • Measurements using Calipers & standard scale.
  • Check measurements of components/machined parts, using micrometers and verniers.
  • Check roundness of components using the dial test indicator and V-blocks.


Describe the principle of the measuring instruments: its use and care for measurement setting up and assembly operations-

Micrometer: internal, external, depth.

Vernier: Caliper, depth, height. bore dial gauge.

Dial test indicator: its measurement.

Milling operation: (120 hours)

  • Marking practice. Use of hand tools.
  • Plain milling, slab milling.
  • Work alignment, cutting as per sample and parting off.
  • Checking flatness with tri-square.
  • Checking squareness with tri-square.
  • Step milling using side and face milling cutter.
  • Milling six faces of a cubical block to an accuracy of ± 0.1mm.
  • Measure using Vernier caliper
  • Angular milling using angular milling cutter and checking with bevel protractor.
  • Slot milling using slot milling cutter / slitting saw.


  • Describe the geometry of the milling tool including tool angles and its effect on machining operation.
  • Cutting fluid types, properties & applications.
  • Selection of cutting speed, feed and depth of cut.

CNC Milling: (120 hours)

  • Personal and CNC machine Safety.
  • Select, use, clean and store personal protective equipment.
  • CNC machine console
  • Machine over travel limits and emergency stop.
  • Machine starting & operating in Reference Point, JOG, and Incremental Modes
  • Work and tool setting.
  • Co-ordinate system points, assignments and simulations.
  • Absolute, incremental and polar co-ordinate points programming assignments and simulations.
  • Carryout Automatic Mode operation.
  • Carryout Linear interpolation & Circular interpolation assignments and simulations.
  • Manual Data Input (MDI) mode
  • Work off set measurement and Tool off set measurement entry in CNC Control and editing.
  • Part program preparation, Simulation and Automatic Mode Execution of CNC Machine for the machining a pocket with end milling using CRC command.
  • Tool change in CNC milling & JOG, INC, MPG mode operation.


  • Safety Precautions in CNC operation.
  • State the Safe handling of tools, equipment & CNC machines.
  • Describe CNC system working.
  • State CNC Machines Milling, Types, and Machine axes.
  • Identify cutting tool materials for CNC Milling and its applications.
  • State the Safe handling of tools, equipment & CNC machines, Conventional & CNC machining.
  • Explain the working principle of CNC Machine.
  • Describe Machine tool elements, Feed Drives and spindle drives.
  • State the use of ISO codes for carbide indexable inserts and tool holders for Milling.
  • Co-ordinate systems and Points.
  • Describe the method of Zero off sets and tool off sets in Milling.
  • Measurement of zero offsets and Tool offsets.
  • Describe the tooling systems for CNC Machining Centers.
  • Work locating principle and locating devices for CNC milling, tool selection
  • Carry out tool path simulation
  • State the purpose of Cutter Radius Compensation (CRC).
  • Cutting parameters- cutting speed, feed rate , depth of cut, tool wear, tool life, relative effect of each cutting parameter on tool life.
  • Cutting parameters selection and process planning.
  • Tools layout and process sheet preparation.
  • Using Sub Programs & Cycles in the Main Program.
  • Describe the Work-piece zero points and ISO/DIN G and M codes for CNC milling.
  • Indicate Machining parameters for milling for face milling and end milling.

CNC Advance Milling: (120 hours)

  • Part programs & Simulation Automatic Mode Execution of CNC Machine for the exercise on End milling with polar co-ordinates and practical on Simple drilling-G 81.
  • Geometry and wear offset correction.
  • Part Program Preparation, entry and simulation on CNC Mill & on Computers.
  • Practical on Chamfer and counter-sink drilling.
  • Practical on Deep hole drilling G 83.
  • Practical on tapping G 84.
  • Practical on Boring cycles G 85 - G 89.
  • Part Program Preparation, entry and simulation on CNC Mill & on Computers for Part program exercises.
  • Automatic mode execution of With Block Search and restart.


  • Work locating principle and locating devices for CNC milling, tool selection
  • Carry out tool path simulation.
  • Describe the Drilling /Boring cycles in CNC Milling.
  • Grooving/Threading Tools, Processes and Tool selection.
  • Programming for Grooving/Threading on OD/ID in CNC Milling.
  • State the importance of Helical Interpolation and Thread Milling, advantages and limitations in CNC Milling.
  • Describe the Machining of rectangular / circular pockets on CNC milling.
  • Explain Drilling, milling patterns on CNC milling.