1) (i) Explain the difference between the following two types of motion controls used in CNC machines:
(a) Point to point or position control
(b) Contouring or continuous path control
Give on example each of their application.
2) A stepper motor is used in a CNC positioning system, for driving the table through a lead screw of pitch = 3 mm. The control resolution for the table movement is specified as 0.01 mm. Determine
- Point to point or position control
- Contouring or continuous path control
Give on example each of their application.
3) A stepper motor is used in a CNC positioning system, for driving the table through a lead screw of pitch = 3 mm. The control resolution for the table movement is specified as 0.01 mm. Determine
- The number of pulses which the motor should give per revolution.
- The size of step angle of the motor.
- The linear travel rate of the table.
The motor works at a pulse rate of 200/s