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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Prepare investment materials
   • Sprue/tree materials are prepared/built, if necessary.
   • Assembled tree/materials are checked, if necessary.
   • Casting methods and equipment are selected appropriate to task.
   • Associated tools and equipment are prepared.
2. Invest flask
   • Flask is assembled for casting.
   • Investment is mixed correctly.
   • Curing stage is prepared.
3. Operate 'lost wax' sequence
   • 'Low melt' wax is evacuated by steam process, if necessary.
   • Investment flask is positioned/stored correctly.
   • 'Burn-out' procedure is selected and applied.
4. Decontaminate/clean site
   • Tools, equipment and site area are cleaned correctly.

Required Skills

Required skills

Look for evidence that confirms skills in reading and following routine taskrelated information checking preassembled wax for security size and weight selectingcheckingcleaning sprue and investment materials selecting appropriate components recording weights selecting and assembling appropriate flask size calculating and weighing out proportions of investment material and water performing mixing vibrating and vacuum procedures operating steamer and process inspecting flasks for residue prior to burnout selecting appropriate burnout procedureequipment positioningstoring flask inspecting and adjusting ovenkiln cavity cleaning working area and all tools and investing equipment of investment residue disposing of residue and materials

Required knowledge

Look for evidence that confirms knowledge of procedures for checking built wax casting methods and equipment and processes sprueinvestmenttoolsequipmentmaterials techniques for spruetree styles and selectionapplication of the processes selection of flask and components for specific casting processes procedures and computations for mixing proportions time calculations volume and weights etc appropriate gloss offset time allowance prior to base removal occupational health and safety requirementsissues requirements for curingset stage sequence and values for time temperature andor cam settings steamer process suitability of flaskinvestment for burnout sequence procedures adjustments for variables procedures for storage and positioning procedures for cleaning storage andor removal of materials the reasons for appropriateapproved housekeeping functions recording procedures hazards and control measures including housekeeping use and application of personal protective equipment safe work practices and procedures

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package
Overview of assessment	A person who demonstrates competency in this unit must be able to perform investment procedures for lost wax casting process Competency in this unit cannot be claimed until all prerequisites have been satisfied
Critical aspects for assessment and evidence required to demonstrate competency in this unit	Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria including required knowledge and be capable of applying the competency in new and different situations and contexts
Context of and specific resources for assessment	This unit may be assessed on the job off the job or a combination of both on and off the job Where assessment occurs off the job that is the candidate is not in productive work then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team The assessment environment should not disadvantage the candidate This unit could be assessed in conjunction with any other units addressing the safety quality communication materials handling recording and reporting associated with performing investment procedures for lost wax casting process or other units requiring the exercise of the skills and knowledge covered by this unit
Method of assessment	Assessors should gather a range of evidence that is valid sufficient current and authentic Evidence can be gathered through a variety of ways including direct observation supervisors reports project work samples and questioning Questioning techniques should not require language literacy and numeracy skills beyond those required in this unit of competency The candidate must have access to all tools equipment materials and documentation required The candidate must be permitted to refer to any relevant workplace procedures product and manufacturing specifications codes standards manuals and reference materials
Guidance information for assessment

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Casting method and equipment	Centrifical and vacuum casting
Associated tools and equipment	Flasks and base Investment Scales Mixers Bowls Vacuum

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