gen-define-cnc-machining-basics-and-give-one-short-worked-exampl-448f

Define CNC machining basics and give one short worked example.

# CNC Machining Basics **CNC (Computer Numerical Control) machining** is a manufacturing process where pre-programmed computer software controls the movement of factory tools and machinery to remove material from a workpiece and create a desired part. ## Key Components: - **Controller**: Computer that reads G-code instructions - **Machine**: Mill, lathe, router, etc. - **Cutting tools**: Drills, end mills, turning tools - **Workpiece**: Raw material being machined ## Basic Process: 1. Design part in CAD software 2. Generate toolpaths using CAM software 3. Convert to G-code (machine instructions) 4. Load material and tools 5. Run program to machine part --- ## Simple Worked Example: Drilling a Hole **Task**: Drill a 10mm diameter hole, 20mm deep in an aluminum block **G-code Program**: ``` N10 G21 G90 ; Use metric units, absolute positioning N20 G00 X50 Y50 ; Rapid move to position (50, 50) N30 G00 Z5 ; Move to 5mm above surface N40 S1200 M03 ; Start spindle at 1200 RPM clockwise N50 G01 Z-20 F100 ; Feed down 20mm at 100mm/min N60 G00 Z5 ; Retract to safe height N70 M05 ; Stop spindle N80 M30 ; Program end ``` **Result**: A precise 10mm hole drilled at coordinates (50, 50) to 20mm depth.