IET 406 Final Exam Study Sheet
Answers Graded A+
How is computer numerical control (CNC) distinguished from conventional NC? - ANS ✔NC is a
form of programmable automation in which the mechanical actions of a machine
tool or other equipment are controlled by a program containing coded
alphanumeric data. CNC machine tool is a highly automated system that is composed of
multiple control systems. The main difference is automation vs mechanical actions.
Name the ten features and capabilities of modern CNC machine control unit. - ANS ✔Automatic
tool changer and tool storage unit, automatic pallet changer, automatic pallet
Storage and handling system, screen units, spindle coolant system, on-point cut-off
Capabilities, rotary tables, servo motors, tool libraries, multi-axis control, CAM/CAM
software integration
Name the six part characteristics that are most suited to the application of numerical control -
ANS ✔Batch production, repeat orders, complex part geometries, much metal needs to be
removed from starting workpart, many separate machining operations on the part, part is
expensive.
Mathematical analysis spindle rotational speed. - ANS ✔954.93 rev/min
Mathematical analysis feed rate - ANS ✔95.79 mm/min
Mathematical analysis time to move between positions (including loss time) - ANS ✔0.937 min
Answers Graded A+
How is computer numerical control (CNC) distinguished from conventional NC? - ANS ✔NC is a
form of programmable automation in which the mechanical actions of a machine
tool or other equipment are controlled by a program containing coded
alphanumeric data. CNC machine tool is a highly automated system that is composed of
multiple control systems. The main difference is automation vs mechanical actions.
Name the ten features and capabilities of modern CNC machine control unit. - ANS ✔Automatic
tool changer and tool storage unit, automatic pallet changer, automatic pallet
Storage and handling system, screen units, spindle coolant system, on-point cut-off
Capabilities, rotary tables, servo motors, tool libraries, multi-axis control, CAM/CAM
software integration
Name the six part characteristics that are most suited to the application of numerical control -
ANS ✔Batch production, repeat orders, complex part geometries, much metal needs to be
removed from starting workpart, many separate machining operations on the part, part is
expensive.
Mathematical analysis spindle rotational speed. - ANS ✔954.93 rev/min
Mathematical analysis feed rate - ANS ✔95.79 mm/min
Mathematical analysis time to move between positions (including loss time) - ANS ✔0.937 min
