a) Sketch the main components in CNC machine and describe ONE (1) component that responsible in control the servo motor. (4 marks) b) Write a complete simple milling program (ISO format, Siemen controller) on Figure Q1(b) to milling open slot using absolute mode coordinate system. Take spindle speed 5000 rpm, Endmill 20 (diameter cutter=20 mm) and feed rate 1000 mm/min. 25 120 + [X=Y=0] X Figure Q1b All unit in mm (6 marks)