CNC TURNING
Name of Sector Production & Manufacturing Name of Module CNC Turning
Minimum Age 18 Years Duration of Course 6 Months
ADU Code MAN702

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 Turning Centre Machine Elements & 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 Turret.

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

Do Machining operations like Turning, Facing, Contour Turning with Roughing/Finish Turning using Stock Removal Cycles, Sub programming.

Grooving, Thread Cutting, 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 norms


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

Lathe & Tool specification: (20 hours)

  • Demonstration of turning operation on lathe.
  • Practice on operation of lathe
  • Selection of tools, general cleaning and maintenance and safe storage of tools applicable to workshop tasks.


  • Introduction to Lathe, description, types of Lathe - constructional features and functions.
  • Specification of a Center Lathe.
  • Identify types of lathe tools and their uses.
  • Classification & properties of tool materials & selection criteria. ISO specification on carbide tools.

Job Holding & Centering: (20 hours)

  • Demonstrate the use of job holding devices on metal cutting machines & safety precautions.
  • Study of process planning sheet
  • Practice on centering the job.
  • Use of three and four-jaw chuck
  • Soft jaw boring.


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

Measuring job: (20 hours)

  • Check measurements using Calipers & standard steel rule : Inch and Metric
  • Check measurements of components/machined parts, using micrometers and Vernier, bore gauge, height gauge, depth gauge
  • 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.

Gauges: bore gauge, height gauge,depth gauge

Vernier: Caliper, depth, height.

Dial test indicator: its measurement.

Turning operation: (100 hours)

  • Simple turning using manual feed.
  • Practical on work alignment, facing, turning, drilling, filleting, chamfering, grooving and parting off.
  • Practical on knurling.
  • Sharpening of turning, boring, grooving, parting off tool on pedestal grinder and inspection.
  • Carryout general turning between centers, usage of steady and follower rests.


  • Describe the geometry of the lathe tool including tool angles and its effect on turning for roughing and finishing operation.
  • Type of cutting fluids & properties.
  • Calculation of speed, feed & depth of cut using feed-speed chart.
  • Carry out Simple machining calculation.
  • Lathe operations- turn, drill, face, chamfer, and part off knurl, threading, taper and form turn.

CNC Turning: (120 hours)

  • Personal and CNC machine Safety.
  • Select, use, clean and store personal protective equipment.
  • CNC machine, CNC 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 and incremental programming assignments and simulations.
  • Work off set measurement, Tool off set measurement and entry in CNC Control.
  • Tool nose radius and tool orientation entry in CNC control.
  • Jaw removal and mounting on CNC Lathe.
  • Manual Data Input (MDI) and MGP mode operations and checking of zero offsets and tool offsets.
  • Soft jaw boring.
  • Program checking in dry run, single block modes. Checking finish size by over sizing through tool offsets.
  • Part program preparation, Simulation & Automatic Mode Execution for the exercise on Simple turning & Facing (step turning)
  • Linear interpolation, and Circular interpolation assignments and simulations on soft ware.
  • Part program preparation, Simulation & Automatic Mode Execution for the exercise on Turning with Radius / chamfer with TNRC.
  • Part program preparation, Simulation & Automatic Mode Execution of CNC Machine for the exercise on Blue print programming contours with TNRC.


  • Safety Precautions in CNC operation.
  • State the Safe handling of tools, equipment & CNC machines, Conventional & CNC machining.
  • State the types of CNC machines, advantages & limitations of CNC, computer numerical control applications,
  • Describe CNC interpolation, open and close loop control systems. Co-ordinate systems and Points.
  • State the CNC Machines - Turning - Milling, -, Machine axes identification.
  • Identify the CNC Machine Control Unit organization.(Keys & Menus)
  • Explain working principle of CNC Machine.
  • Setting work and tool offsets.
  • Importance of feedback devices for CNC control.
  • Importance of Tool Nose Radius Compensation (TNRC).
  • Cutting tool materials for CNC Turning and its applications
  • ISO nomenclature for turning tool holders, boring tool holders, indexable inserts.
  • Tool holders and inserts for radial grooving, face grooving, threading, drilling.
  • 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 from a tool manufacturer’s catalog for various operations, process planning.
  • Describe the tooling systems for CNC TURNING Centers.
  • State the cutting parameters selection and process planning.
  • Tools layout and process sheet preparation.

CNC Advance Turning: (120 hours)

  • Geometry Wear Correction.Geometry and wear offset correction.
  • Part program preparation, Simulation & Automatic Mode Execution of CNC Machine for the exercise on turning.
  • Stock removal cycle OD
  • Drilling / boring cycles
  • Stock removal cycle ID
  • Part programs for thread cutting for CNC turning centers and simulation on computers.
  • Machining of Part program exercises of CNC TURNING
  • ■ Grooving and thread cutting OD

    ■ Grooving and thread cutting ID

    ■ Threading cycle OD

    ■ Sub programs with repetition

    Using Sub Programs & Cycles in the Main Program.



  • Processes sequencing.
  • Tool path study of machining operations
  • Work-piece zero points and ISO/DIN G and M codes for CNC.
  • Describe the stock removal cycle in CNC turning for OD / ID operation.
  • Describe Tooling system for turning
  • Carryout Drilling /Boring cycles in CNC Turning.
  • Grooving/Threading Tools, Processes and Tool selection.
  • Describe Tapping on CNC turning.
  • Programming for Grooving/Threading on OD/ID in CNC Turning.
  • Trouble shooting in CNC lathe machine
  • Identify Factors affecting turned part quality/ productivity.