CNC – Turning

Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, describes a helical toolpath by moving more or less linearly while the workpiece rotates. The tool’s axes of movement may be literally a straight line, or they may be along some set of curves or angles, but they are essentially linear (in the nonmathematical sense). Usually the term “turning” is reserved for the generation of external surfaces by this cutting action, whereas this same essential cutting action when applied to internal surfaces (that is, holes, of one kind or another) is called “boring”.

Module 1:

Basic Turning Centre Principles

      • Different Models of Machine and Controls
      • Operating Principles (CNC Turning) (VTL)
      • Basic Components of the machine (Spindle, drives, Measuring systems, Encoders & Ball Screws, pallets)

Module 2:

Basic Machining Introduction-

    • Difference   between NC & CNC Systems
    • Open Loop &    Closed loop control system
    • Control Modes (point to point, straight, Contouring Control)
    • Power supply

Module 3:

Machining Centre Coordinate System

      • Planes (G18)
      • Coordinate System (Absolute, increment, &Polar)  (XZ,UW,A)

Module 4:

Programming methods of CNC Machining Centers

    • NC related Dimensioning (Absolute & Incremental)
    • Polar Coordinates
    • Programming Languages
    • (ISO/NC Programming)
    • Different Programming words(N,G,M,T,S,F,X,Y,Z, A,B,C, i, j, k)

Module 5:

Understanding the Codes

      • Modal & Non Modal Codes
      • Explanation of G00, G01, G02 and G03
      • Plane Selection
      • M00, M01, M02, M03, M04, M05, M08, M30

Module 6:

PRACTICAL

    • Different Keys
    • Different Switches (Emergency, Reset, Cycle Start, Speed & feed Override, Jog)

Module 7:

Understanding of

      • feed rate (mm/min, m. m per revolution)
      • G98 & G99
      • depth of cut-speed/rpm(S)
      • Surface Speed Vc

Module 8:

Coordinates & Directions of Movement

    • Signs of Coordinates (X,Z)
    • Direction Of movement
    • Machine Zero Tool Offset & Program Zero

Module 9:

PRACTICAL

      • Tool   Change   Location
      • Home
      • Zero Return

Module 10:

Turning Tools & Operations

    • Different Turning Operations
    • Application of different Tools
    • Left Hand Tools, Right Hand Tools
    • Solid and Insert type Cutters

Module 11:

Other Tooling   Operations &   Coolant   Use

      • Drilling   boring   , Reaming, Tapping operations
      • Tool Holders
      • Use   of Coolant

Module 12:

PRACTICAL

    • Reference   Point   & Over Travel   Recovery
    • Reference and   Machine
    • Machine Zero & program Zero
    • Z axis Return
    •  Hand Pulse wheel
    • Interface
    • Tool Offsets

Module 13:

      • Inches   & m.m. Mode (G20 & G21)
      • Absolute & Incremental programming (U & W)
      • Tool    Offsets    (G40, G41, G42)

Module 14:

PRACTICAL

  • Job setting
  • Tool setting / Tooling in Machine

Module 15:

Understanding   of

    • Turning Cycles (G70G, G71, G72, G73, G74, G75, G76)
    • G90, G92 & G94