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Computer Numerical Control
M/C
Definition
• Computer Numerical Control (CNC) is one in
which the functions and motions of a machine
tool are controlled by means of a prepared
program containing coded alphanumeric data
say letters, numbers, and special characters.
• Automatically operating a machine based on
codes is called numerical control.
Advantages
• Parts can be produced in less time
– by reducing the number of setups
– by reducing setup time
– by reducing workpiece-handling time
– by reducing tool-changing time
• Parts can be produced more accurately
• The operator involvement in part
manufacture is reduced to a minimum
Advantages continued…
• No need for expensive jigs and fixtures
• Inspection time is reduced
• Need for certain types of form tools is
completely eliminated
• Lead times needed can be reduced to a
great extent
• Reduces the number of machines on the
shop floor
Limitations
• Cost of machine is much high
• skilled people required to operate
machine
• Special training needed to operator.
• higher investments for maintenance
• Automatic operation of NC machines
implies relatively higher running costs
Control system
• Open loop system
• Closed loop system
Elements of CNC
• Input device
• Machine control unit
• Machine tool
• Driving system
• Feed back devices
• Display unit
decode
Coverts
electrical
pulse
Driving system
• DC servo motor
• AC servo motor
• Stepper motor

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CNC kjk bgkjigki liugiukgklkbgfyvjh.pptx

  • 2. Definition • Computer Numerical Control (CNC) is one in which the functions and motions of a machine tool are controlled by means of a prepared program containing coded alphanumeric data say letters, numbers, and special characters. • Automatically operating a machine based on codes is called numerical control.
  • 3. Advantages • Parts can be produced in less time – by reducing the number of setups – by reducing setup time – by reducing workpiece-handling time – by reducing tool-changing time • Parts can be produced more accurately • The operator involvement in part manufacture is reduced to a minimum
  • 4. Advantages continued… • No need for expensive jigs and fixtures • Inspection time is reduced • Need for certain types of form tools is completely eliminated • Lead times needed can be reduced to a great extent • Reduces the number of machines on the shop floor
  • 5. Limitations • Cost of machine is much high • skilled people required to operate machine • Special training needed to operator. • higher investments for maintenance • Automatic operation of NC machines implies relatively higher running costs
  • 6. Control system • Open loop system • Closed loop system
  • 7. Elements of CNC • Input device • Machine control unit • Machine tool • Driving system • Feed back devices • Display unit
  • 9. Driving system • DC servo motor • AC servo motor • Stepper motor