Lesson 1Basic CNC Program Structure and Common G-code/M-code Elements for VerificationThis part introduce basic structure of CNC programs, key G and M codes, and how to read blocks, comments, and tool calls so operators fit verify programs for safety, correct movements, and compatibility with the setup in Liberian factories.
Program header, safety lines, and commentsTool call, spindle speed, and coolant commandsLinear and circular motion G-code essentialsWork coordinate systems and tool length offsetsCommon M codes for spindle, coolant, and program endLesson 2Actions for Abnormal Conditions Found During Pre-start (Tagging, Notifying, Isolating, Initiating Maintenance)This part define proper responses to abnormal findings before starting, including tagging, isolating, notifying responsible people, and starting maintenance, while preventing unsafe shortcuts or unauthorized fixes in our local operations.
Recognizing critical versus minor abnormalitiesApplying tags and documenting out-of-service statusIsolating energy sources when hazards are presentNotifying supervisors and maintenance promptlyRecording issues in logs or digital systemsLesson 3Mandatory PPE for CNC Work and Rationale (Eye Protection, Hearing Protection, Cut-resistant Gloves, Aprons, Safety Shoes)This part detail required personal protective equipment for CNC milling, why each one needed, and how to choose, check, and use it right, linking dangers like flying chips, noise, and sharp edges to specific gear for safe work in Liberia.
Eye and face protection for chips and coolant splashHearing protection selection for shop noise levelsCut-resistant gloves for handling tools and stockProtective clothing, aprons, and sleeves near rotating partsSafety footwear for impact and slip protectionLesson 4Common Lockout/Tagout Procedure Steps Applied to CNC Machines (Isolation, Verification, Documentation)This part outline typical lockout/tagout steps for CNC machines, including isolating energy, releasing it, verifying, and documenting, stressing coordination with maintenance and following site procedures in Liberian plants.
Identifying all CNC energy sources and pointsShutting down machine using normal stop sequenceApplying locks, tags, and group lockout devicesVerifying zero energy and tryout of controlsRestoring energy and removing locks safelyLesson 5CNC Milling Machine Components and Control Interface (Spindle, Axis Drives, Tool Changer, Coolant, PLC/HMI)This part explain main components of CNC milling machine and the control interface, showing how spindle, axes, tool changer, coolant, PLC, and HMI work together, and how operators use screens, keys, and modes safely in our settings.
Spindle assembly, drive, and speed controlLinear axes, ball screws, and feedback systemsAutomatic tool changer and tool magazine basicsCoolant delivery, chip evacuation, and guardingHMI screens, soft keys, and mode selectionPLC safety logic, interlocks, and status lightsLesson 6Machine-specific Safety Hazards (Entanglement, Flying Chips, Tool Breakage, Coolant Exposure, Electrical Risks)This part review specific CNC hazards like entanglement, flying chips, tool breakage, coolant exposure, and electrical risks, and link each to preventive measures and safe practices for Liberian machine operators.
Entanglement risks from rotating tools and partsFlying chips and high-velocity particle hazardsTool breakage causes and containment methodsCoolant mist, skin contact, and ventilation needsElectrical shock and arc risks around CNC cabinetsLesson 7Daily and Shift Inspection Items for CNC (Tool Wear, Spindle Runout, Coolant Level, Chip Evacuation)This part define daily and shift inspection items like tool wear, spindle runout, coolant level, and chip evacuation, showing how routine checks prevent breakdowns, improve finish, and support steady production in Liberia.
Visual inspection of guards, doors, and panelsChecking tool wear, chipping, and pull stud conditionMonitoring spindle noise, heat, and basic runoutCoolant level, concentration, and contamination checksChip conveyor, augers, and filter cleanlinessLesson 8Verifying Guards, Interlocks, and Emergency Stops on CNC MachinesThis part focus on verifying guards, interlocks, and emergency stops, explaining test methods, acceptance criteria, and documentation so operators confirm safety systems work before and during use in local factories.
Types of fixed, movable, and interlocked guardsTesting door interlocks and safety switchesVerifying emergency stop buttons and circuitsConfirming light curtains or area scannersDocumenting safety device tests and findingsLesson 9CNC Pre-start Checklist: Mechanical, Electrical, Tooling, Workholding and Coolant System ChecksThis part cover a structured CNC pre-start checklist, including mechanical, electrical, tooling, workholding, and coolant checks, emphasizing documentation, repeatability, and early detection of unsafe or abnormal conditions.
Visual walkaround and housekeeping verificationMechanical axis travel and limit stop checksElectrical panels, indicators, and cable conditionTooling integrity, clamping, and offset confirmationWorkholding security and part location verificationCoolant level, concentration, and flow path checks
