Q1: Name some characteristics of NC Machine Tool?
Ans: The characteristics of NC machine tools are as followsare:
- ➔ High accuracy and precision
- ➔ Automatic operation
- ➔ Reduced human involvement
- ➔ Repeatability of parts
Q2: Name the types of NC/CNC Machine Tool?
Ans: The types of NC/CNC machine tools are as follows:
- 1. According to Control Panel
- ➔ NC (Numerical Control) Machine
- ➔ CNC (Computer Numerical Control) Machine
- ➔ DNC (Direct Numerical Control) Machine
- 2. According to Working
- ➔ NC/CNC Cutting Machine
- ➔ Lathe Machine
- ➔ Milling Machine
- ➔ NC/CNC Forming Machine
- ➔ Spring Forming Machine
- ➔ Press Brakes Machine
- ➔ NC/CNC Grinding Machine
- ➔ Surface Grinder
- ➔ Cylindrical Grinder
- ➔ Tool Grinder
- ➔ Profile Grinder
- ➔ Cam Grinder
- ➔ NC/CNC Electric Discharge Machine
- ➔ Die Sinking EDM
- ➔ Wire Cut EDM
Q3: Write the structure of NC Machine Tool.
Ans: Structure of an NC machine tool includes:
- ➔ Input device
- ➔ Controller (MCU)
- ➔ Drive system
- ➔ Machine tool
- ➔ Feedback system
Q4: Write the parts of NC Machine Tool.
Ans: Main parts of an NC machine tool are as follows:
- ➔ Control panel
- ➔ Spindle
- ➔ Tool holder
- ➔ Table
- ➔ Drive motors
Q5: Define CNC Router.
Ans: A CNC router is a CNC machine used to cut, engrave, or shape materials like wood, plastic, and aluminum.
Q6: Define CAM Grinder.
Ans: A CAM grinder is a machine used to accurately grind cam profiles.
Q7: Define Saddle.
Ans: A saddle is a machine part that supports and moves the table in a machine tool.
Q8: Define Automatic Tool Changer.
Ans: An automatic tool changer is a device that changes cutting tools automatically during machining.
Q9: What is meant by “Tool to Tool” Time?
Ans: Tool to tool time is the time taken to change one cutting tool to another.
Q10: What is a Coolant Supplying Device?
Ans: A coolant supplying device delivers coolant to reduce heat and friction during machining.
Q11: Define Hydraulic Power Unit.
Ans: A hydraulic power unit supplies pressurized hydraulic fluid to operate machine components.
Q12: Define Pneumatic Power Unit.
Ans: A pneumatic power unit uses compressed air to operate machine tools and devices.
Q13: Define Stepping Motors.
Ans: Stepping motors move in fixed steps and are used for precise position control.
Q14: Define Servo Motors.
Ans: Servo motors provide continuous motion with high accuracy using feedback control.
Q15: Define Simulations.
Ans: Simulation is the virtual testing of a machining process before actual operation.
Q16: What is the Mist Coolant Method?
Ans: Mist coolant method sprays coolant in fine mist form to cool the cutting area.
Q17: Name four characteristics of NC/CNC Machine Tool.
Ans: The characteristics of NC/CNC Machine Tools are as follows:
- ➔ High speed operation
- ➔ High accuracy
- ➔ Automation
- ➔ Consistent quality
Q18: Name four uses of NC/CNC Machine Tool.
Ans: Some of the uses of NC/CNC machine tools are as follows:
- ➔ Mass production
- ➔ Precision machining
- ➔ Complex shape manufacturing
- ➔ Tool and die making
Q19: Why are NC Machine tools preferred over traditional machine tools?
Ans: NC machine tools are preferred because they provide higher accuracy, faster production, and reduced human error.
Q20: Name some traditional machine tools.
Ans: The traditional machine tools are as follows:
- ➔ Lathe machine
- ➔ Drilling machine
- ➔ Milling machine
- ➔ Shaper machine
