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Elements and Performance Criteria

1. Prepare to operate and monitor a CNC machine
   • Job requirements are determined from workplace instructions
   • Information is sourced, procedures and methods are analysed, and appropriate options are selected for operating and monitoring CNC machine
   • Pre-start checks are undertaken according to manufacturer procedures
   • Hazards associated with the work are identified and risks are managed
2. Operate a CNC machine
   • Computer program is selected and verified according to workplace instructions
   • CNC machine is operated to product specifications according to workplace procedures and safety and environmental requirements, and following machinery safe operating procedures
   • Machine malfunctions are identified and reported according to workplace procedures
   • Machined component is checked to ensure compliance with specifications
3. Perform necessary adjustments during machining process
   • Tool wear is monitored and, where appropriate, pre-set tools are replaced, tool offsets are identified in computer-controlled program and adjusted, or other corrective action is taken according to manufacturer specifications and workplace procedures
   • Engine component deviation from specification is reported according to workplace procedures
4. Complete work processes
   • Final inspection is made to ensure finished work complies with workplace requirements and CNC machine is presented ready for use
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • CNC machine and equipment are cleaned for use or storage according to workplace procedures
   • Workplace documentation is processed according to workplace procedures
5. Prepare to operate and monitor a CNC machine
   • Job requirements are determined from workplace instructions
   • Information is sourced, procedures and methods are analysed, and appropriate options are selected for operating and monitoring CNC machine
   • Pre-start checks are undertaken according to manufacturer procedures
   • Hazards associated with the work are identified and risks are managed
6. Operate a CNC machine
   • Computer program is selected and verified according to workplace instructions
   • CNC machine is operated to product specifications according to workplace procedures and safety and environmental requirements, and following machinery safe operating procedures
   • Machine malfunctions are identified and reported according to workplace procedures
   • Machined component is checked to ensure compliance with specifications
7. Perform necessary adjustments during machining process
   • Tool wear is monitored and, where appropriate, pre-set tools are replaced, tool offsets are identified in computer-controlled program and adjusted, or other corrective action is taken according to manufacturer specifications and workplace procedures
   • Engine component deviation from specification is reported according to workplace procedures
8. Complete work processes
   • Final inspection is made to ensure finished work complies with workplace requirements and CNC machine is presented ready for use
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • CNC machine and equipment are cleaned for use or storage according to workplace procedures
   • Workplace documentation is processed according to workplace procedures

Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Selecting and verifying must include:

correct speed and feed rates of tools for cast iron and aluminium.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including operational risk assessment and treatments associated with: selecting and using personal protective equipment (PPE) when working with CNC machines and using chemical cleaning and lubricating agents safe operating procedures for operating CNC machinery environmental requirements, including procedures for trapping, storing and disposing of cooling and lubricating fluids released during machining process.

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Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

conduct computer numerical control (CNC) machining of a shape in aluminium alloy, in which the work must involve:

drilling and tapping four holes

machining a pocket in the shape

surface machining one face on the shape

conduct CNC machining of a shape in cast iron, in which the work must involve:

drilling and tapping four holes

machining a pocket in the shape

surface machining one face on the shape.

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Knowledge Evidence

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to operating and monitoring CNC machines, including operational risk assessment and treatments associated with:

selecting and using personal protective equipment (PPE) when working with CNC machines and using chemical cleaning and lubricating agents

safe operating procedures for operating CNC machinery

environmental requirements, including procedures for trapping, storing and disposing of cooling and lubricating fluids released during machining process

procedures for accessing computer-controlled programs installed in the machine controller, including:

posting appropriate program to the machine

selecting tool specified by the program and for the material to be machined

selecting appropriate speeds and feeds

computer-controlled machine operating procedures, including:

zeroing the machine axes

engaging warm-up procedures, and checking lubricant levels, coolant levels, and machine slide ways

mounting tools in tool holders

setting tool speed and feed rates

setting tool height manually

setting machine offset parameters to correct tool number and height

setting work piece datum

recording data in machine offsets

selecting dry run mode on CNC controller and single block to test program

procedures for basic editing of computer program to reflect specific job requirements

typical machine malfunctions, including:

programming

non-optimal speeds and feeds

inflexible controller

tool wear and effect of wear on product or part specifications

procedures to be followed once tool wear has been detected

pre-set tool replacement procedures

adjustment procedures for tool offsets

effects of adjustments on machining specifications.

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