This unit applies to the preparation of flexible moulds to replicate an original model. Types of rubber material used may include natural and silicon varieties of differing working specifications such as shrinkage and transparency. Vulcanisation may include RTV as well as standard heat and pressure combinations.

Band: A

Unit Weight: 2

ELEMENT

PERFORMANCE CRITERIA

1. Prepare and pack mould frame/systems

1.1. Appropriate mould frame/moulding system is selected for given job.

1.2. Appropriate rubber is selected for style of master.

1.3. Rubber is prepared and packed correctly.

2. Vulcanise/cure rubber

2.1. Appropriate curing system is selected.

2.2. Assembled mould is cured, cooled, removed.

3. Release mould

3.1. Appropriate tools and procedure for the release of master pattern are selected.

3.2. Master pattern is released correctly.

Required skills

Look for evidence that confirms skills in:

following work procedures

selecting appropriate frame/system to suit master requirements

preparing/packing master, frame/system

selecting variables of time, temperature, and pressure

cutting rubber

selecting and using tools/methods for release of master

safely releasing master without damage

reading and interpreting routine information on written job instructions, specifications and standard operating procedures. May include drawings

using measurement skills needed to meet the requirements of this unit

entering routine and familiar information onto proformas and standard workplace forms

planning, sequencing operations

Required knowledge

Look for evidence that confirms knowledge of:

work procedures

procedures for assessing frame/system

the specific master requirements

procedures for assessing rubber/ master suitability/compatibility

working limitations of rubber

procedures for correct packing technique

packing variations for a range of situations

methods for establishing the appropriate time, temperature and pressure settings for the selected process

the stages in the process for mould curing, removal and cooling

correct selection of tools/procedures

sequence of procedures for release of master

the placement of mould/vent lines

hazards and control measures, including housekeeping

use and application of personal protective equipment

safe work practices and procedures

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 produce rubber moulds for 'lost wax' process.

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 producing rubber moulds for 'lost wax' 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 specifi-cations, codes, standards, manuals and reference materials.

Guidance information for assessment

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.

Mould frame/moulding system

Various shapes and sizes, solid or component systems

Rubber

Silicon, natural rubber

Curing system

Vulcaniser

Tools

Scalpel, vice

Unit sector

Jewellery and horological

This unit contains employability skills.