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Evidence Guide: CUVOPA07B - Use opal carving tools

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

 

CUVOPA07B - Use opal carving tools

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

Select the stone and clarify the required outcome.

  1. Review available pieces of rough opal to determine the suitability or necessity for carving.
  2. Assess the potential of pieces of opal for carving depending on the shape, size, the position of the colour and other characteristics of the stone.
  3. Rub the stone and remove foreign materials and eliminating faults.
  4. Discuss the possibilities with colleagues and client.
  5. Determine the approach to be taken to achieve the potential of the stone and maximise the value of the finished product.
Review available pieces of rough opal to determine the suitability or necessity for carving.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess the potential of pieces of opal for carving depending on the shape, size, the position of the colour and other characteristics of the stone.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Rub the stone and remove foreign materials and eliminating faults.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Discuss the possibilities with colleagues and client.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine the approach to be taken to achieve the potential of the stone and maximise the value of the finished product.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select tools and equipment and materials.

  1. Select carving tools and equipment needed to achieve the desired result.
  2. Select consumable for sanding and polishing the carving.
  3. Determine OHS issues and comply with OHS procedures to be followed when using the equipment and consumables.
Select carving tools and equipment needed to achieve the desired result.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select consumable for sanding and polishing the carving.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine OHS issues and comply with OHS procedures to be followed when using the equipment and consumables.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Carve opal.

  1. Clean stone removing foreign materials and eliminating faults.
  2. Grind to desired shape using high speed fine grit burr accommodating existing colour and patterns.
  3. Ensure opal is not heated.
  4. Sand carving with suitable sanding mediums (from coarse to extra fine).
Clean stone removing foreign materials and eliminating faults.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Grind to desired shape using high speed fine grit burr accommodating existing colour and patterns.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Ensure opal is not heated.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Sand carving with suitable sanding mediums (from coarse to extra fine).

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Polish the carving.

  1. Polish entire carving with polishing compound.
  2. Use magnification to check the finished carving for faults and if necessary rectify faults.
Polish entire carving with polishing compound.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use magnification to check the finished carving for faults and if necessary rectify faults.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Ensure that industry standards are satisfied.

  1. Check the carving to ensure that industry standards are satisfied.
  2. Correct any faults or defects if required.
Check the carving to ensure that industry standards are satisfied.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Correct any faults or defects if required.

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 carve opal to industry standards.

The assessment must confirm the ability to select opal pieces suitable for carving, carve the opal using opal-carving equipment, and polish the carving in accordance with industry standards.

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 or 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 such as the evaluation of the finished piece (or pieces) 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:

carving and polishing equipment

tools and consumables

a qualified workplace assessor or assessment team.

Required Skills and Knowledge

Required skills:

carving skills

sanding and polishing skills.

Required knowledge:

the suitability of opal pieces for carving

opal carving process - the equipment and consumables required

industry standards.

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.

Carving tools may include:

assorted mandrels

coarse, medium, fine and extra fine CRATEX wheels

diamond grinding burrs, assorted shapes

diamond polishing wheels, assorted shapes

diamond sanding wheels, assorted shapes

felt polishing buffs

sanding discs, assorted grit sizes and diameters

silicon-carbide grinding burrs, assorted shapes

supporting equipment, e.g.:

drip feed watering system

dust extraction system

wooden polishing buffs.

Carving equipment may include:

air power tools

centre point carver

flexible drive

hobby carvers, e.g. Dremel

micro motor

personal protective equipment.

Occupational health and safety issues for carving may include:

contamination

eye protection

guarding

keeping a clean work area

minimising dust inhalation

the need to maintain equipment

unattended running machinery.

Sanding mediums may include:

CRATEX wheels, coarse, medium, fine, extra fine, assorted shapes

diamond powders up to #1200 on felt/wooden wheels

pumice powders on felt wheels

sandpaper wheels and discs up to #1200, assorted sizes

silicon-carbide powders up to #1200 on felt/wooden wheels.

Polishing compounds may include:

cerium oxide on felt/leather/wooden wheels or discs

diamond compounds from #1200 to #100,000

tin oxide.

Industry standards may include:

no sharp or protruding areas

when shaping, keep the setting into jewellery in mind

very high polish required

no grinding marks or sanding marks on surface

no cracks or obvious inclusions that should have been removed with initial grinding

if for jewellery, avoid making the carving too large

the more colour, the less detail is required.