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Evidence Guide: CUVOPA402A - Production cut and polish opal

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

CUVOPA402A - Production cut and polish opal

What evidence can you provide to prove your understanding of each of the following citeria?

Select the machinery and consumables for production cutting opal

  1. Select the machinery, consumables and adhesives
  2. Select the lighting equipment for UV-sensitive adhesives
  3. Obtain material safety data sheets (MSDS) for materials used
Select the machinery, consumables and adhesives

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select the lighting equipment for UV-sensitive adhesives

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Obtain material safety data sheets (MSDS) for materials used

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify and coordinate resources

  1. Determine sources and cost of rough opal and obtain supplies
  2. Determine sources and cost of consumables, including backing material and triplet tops, and obtain supplies
  3. Record information about suppliers and costs
  4. Set up stock management system
Determine sources and cost of rough opal and obtain supplies

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine sources and cost of consumables, including backing material and triplet tops, and obtain supplies

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Record information about suppliers and costs

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Set up stock management system

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Review the layout of the workshop and set up machinery and equipment for production cutting

  1. Review workshop layout in relation to production cutting and make adjustments to facilitate workflow where required
  2. Set up multi-blade saw, grinder, sander, polisher and lighting equipment to manufacturers’ specifications
  3. Set up dopping rack and other racks and containers as needed
Review workshop layout in relation to production cutting and make adjustments to facilitate workflow where required

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Set up multi-blade saw, grinder, sander, polisher and lighting equipment to manufacturers’ specifications

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Set up dopping rack and other racks and containers as needed

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Cut and polish opal to industry requirements within the time constraints of the production process

  1. Cut and polish opals to trade requirements within the predetermined time constraints
  2. Use appropriate dopping techniques for production work
  3. Ensure opals satisfy trade requirements for standard millimetre sizes for particular applications
  4. Follow OHS requirements for machinery, equipment and consumables
Cut and polish opals to trade requirements within the predetermined time constraints

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use appropriate dopping techniques for production work

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Ensure opals satisfy trade requirements for standard millimetre sizes for particular applications

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Follow OHS requirements for machinery, equipment and consumables

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

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

Critical aspects for assessment and evidence required to demonstrate competency in this unit

Evidence of the ability to:

cut opal in a production environment meeting industry and quality standards and working with commercial constraints

select machinery and consumables

organise the workshop for production cutting

handle OHS issues appropriately.

Context of and specific resources for assessment

Assessment must ensure access to:

production cutting and polishing equipment, tools and consumables.

Method of assessment

A range of assessment methods should be used to assess practical skills and knowledge. The following examples are appropriate for this unit:

observation of processes and procedures

oral and/or written questioning on underpinning knowledge and skills

review of portfolios of evidence

review of third-party workplace reports of on-the-job performance by candidate.

Assessment methods should closely reflect workplace demands (e.g. literacy) and the needs of particular groups (e.g. people with disabilities, and people who may have literacy or numeracy difficulties, such as speakers of languages other than English, remote communities and those with interrupted schooling).

Guidance information for assessment

Holistic assessment with other units relevant to the industry sector workplace and job role is recommended.

Required Skills and Knowledge

Required skills

communication skills to work with suppliers

planning and organising skills to:

select appropriate tools, equipment and materials

set up a workshop environment

problem-solving skills to correct OHS issues

literacy skills to interpret technical documentation

numeracy skills to:

cost materials

use numerical features of machinery

technical skills to:

choose appropriate stone for cutting

cut, sand and polish opals using correct technique

correct faults and defects

source materials

follow the procedures for stock management

service and test equipment

technology skills to set up and use production equipment.

Required knowledge

characteristics of opal gemstone structure

suitability of opal pieces for carving

opal carving process, including required equipment and consumables

procedures and equipment used in production cutting

where to locate and cost materials for production cutting

stock management requirements

safety issues associated with opal cutting and polishing machinery.

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.

Machinery may include:

cabochon cutting machine

cabochon pre-former

diamond sintered wheel grinder

faceting unit pre-former

high speed sanding unit

multi-blade trim saw

pumice pre-polishing unit

soft diamond wheel sanding and polishing unit

spongy wheel sanding unit

triplet slicing machine

UV light box

vibro tumbler.

Consumables and adhesives may include:

#400 acid treated silicon carbide powder

backing material

blackening agent

dopping wax or adhesive

epoxy adhesive

grinding wheels

polishing powder (cerium oxide)

polishing wheels (diamond or felt)

red sealing wax

rough opal

sanding wheels (diamond or spongy)

trim saw blades

triplet slicing blades: 120, 140, 160 and 180

triplet tops

UV adhesive

water and electricity.

Backing materials may include:

black jade

black potch (best)

boulder iron stone

clear or transparent potch

dark grey potch

glass (triplet only)

obsidian (black)

vitrolite (triplet only).

Stock management system may include:

avoiding cutting irregular sizes or shapes to minimise slow stock

maintaining rough opal and consumable supplies

regularly checking continuity of consumables with suppliers

stocking popular sizes to meet new markets.

Dopping techniques may include:

5-minute epoxy glue

aluminium or wooden dop sticks

collapsible rack for holding dop sticks

green or red sealing wax

vacuum dopping

wood glues.

Standard millimetre sizes may require:

consistent accurate sizes

no grinding marks or sanding marks on surface.