Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

MEM19009B Mapping and Delivery Guide
Perform investment procedures for lost wax casting process

Version 1.0
Issue Date: May 2024


Qualification -
Unit of Competency MEM19009B - Perform investment procedures for lost wax casting process
Description This unit covers preparing investment flasks for jewellery casting.
Employability Skills This unit contains employability skills.
Learning Outcomes and Application This unit applies to the preparation of investment flasks using manual and/or automatic equipment for jewellery casting procedures.Band: AUnit Weight: 1
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.
Prerequisites/co-requisites Path 1MEM12024A Perform computations MEM13003B Work safely with industrial chemicals and materials MEM18001C Use hand tools Path 2MEM07024B Operate and monitor machine/process MEM12024A Perform computations MEM18001C Use hand tools
Competency Field Jewellery and horological
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities 		Slides
PPT 		Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: 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.
       
Element: Invest flask
  • Flask is assembled for casting.
  • Investment is mixed correctly.
  • Curing stage is prepared.
       
Element: 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.
       
Element: Decontaminate/clean site
  • Tools, equipment and site area are cleaned correctly.
       


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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, supervisor's 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

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

Required skills

Look for evidence that confirms skills in:

reading and following routine task-related information

checking pre-assembled wax for security, size, and weight

selecting/checking/cleaning 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 burn-out

selecting appropriate burn-out procedure/equipment

positioning/storing flask

inspecting and adjusting oven/kiln 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

sprue/investment/tools/equipment/materials

techniques for sprue/tree styles and selection/application 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 off/set time allowance prior to base removal

occupational health and safety requirements/issues

requirements for curing/set stage

sequence and values for time, temperature, and/or cam settings

steamer process

suitability of flask/investment for burn-out

sequence, procedures, adjustments for variables

procedures for storage and positioning

procedures for cleaning, storage and/or removal of materials

the reasons for appropriate/approved housekeeping functions

recording procedures

hazards and control measures, including housekeeping

use and application of personal protective equipment

safe work practices and procedures

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

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
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. 
Flask is assembled for casting. 
Investment is mixed correctly. 
Curing stage is prepared. 
'Low melt' wax is evacuated by steam process, if necessary. 
Investment flask is positioned/stored correctly. 
'Burn-out' procedure is selected and applied. 
Tools, equipment and site area are cleaned correctly. 

Forms

Assessment Cover Sheet

MEM19009B - Perform investment procedures for lost wax casting process
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:

Assessment Record Sheet

MEM19009B - Perform investment procedures for lost wax casting process

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: