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Evidence Guide: CUVOPA08B - 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

 

CUVOPA08B - 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.
  2. Select the consumablesandadhesives.
  3. Select the lighting equipment for UV sensitive adhesives.
  4. Obtain Materials Safety Data Sheets for all materials used.
Select the machinery.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select the consumablesandadhesives.

Completed
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Select the lighting equipment for UV sensitive adhesives.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Obtain Materials Safety Data Sheets for all materials used.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify sources of rough opal and consumables and obtain supplies.

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

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Set up multi-blade saw to manufacturers' specifications.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Set up grinder, sander, polisher and lighting equipment.

Completed
Date:

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Set up dopping rack and other racks and containers as needed.

Completed
Date:

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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 all 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 all 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.

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

To achieve competency in this unit, a person must be able to cut opal in a production environment meeting standards of quality and working with commercial constraints.

The assessment must confirm the ability to select machinery and consumables; to organise the workshop for production cutting and cut opals to industry standards within commercial constraints. All OHS issues must be handled appropriately.

Competence in this unit must be assessed over a period of time in order to ensure consistency of performance over the range of variables and contexts applicable to the work environment.

Context of and specific resources for assessment

This unit may be assessed in a work environment, in a simulated work environment or in a combination of these situations.

Method of assessment

For valid and reliable assessment of this unit, evidence should be gathered through a range of methods to indicate consistent performance.

Assessment of this unit of competence will usually include observation of processes and procedures, oral and/or written questioning on underpinning knowledge and skills and other methods as required.

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).

Assessment of this competency requires access to:

production cutting and polishing equipment, tools and consumables

a qualified workplace assessor or assessment team.

Required Skills and Knowledge

Required skills:

set up and use production equipment

source materials

cost materials

follow the procedures for stock management

servicing and testing of equipment.

Required knowledge:

differentiate between standard and production cutting

knowledge of the procedures and equipment used in production cutting

where to locate and cost materials for production cutting

knowledge of stock management requirements.

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 bade 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.

Consumablesand 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, 160,180.

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

maintenance of rough opal and consumables supplies

regular checks with suppliers for continuity of consumables

stock 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

very high polish required

when shaping, keep the setting into jewellery in mind.