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 a variety of lathe operations to specifications. 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 apply the skills covered in this unit of competency in new and different situations and contexts. Critical aspects of assessment and evidence include:

determining requirements for turning job including quantity, material, measurements and tolerances

correct job planning including identifying required measuring equipment, tooling, accessories and sequence of operations

correct preparation of high speed steel tooling

correct fixing of job and tooling

calculating and setting of required speeds and feeds

correct monitoring of turning operation

turning undertaken to trade standard in terms of time and responsibility for own work

undertaking correct remedial procedures for out of specification results as per enterprise procedures e.g. procedures for scrapping or reworking of components not turned to specification.

Context of and specific resources for assessment

This unit has been developed to support training in and recognition of trade level competency in lathe operations as applied to a trade level fitting and machining work environment. Assessment should emphasise a workplace context and procedures found in the candidate's workplace.

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.

Method of assessment

Typically, persons engaged in Engineering Tradesperson - Mechanical work are required to apply their lathe operations skills and techniques across a range of jobs and specifications.

A single assessment event is not appropriate. On the job assessment should be included as part of the assessment process wherever possible. Where assessment occurs off the job, judgement must consider evidence of the candidate's performance in a productive work environment that includes a sufficient range of appropriate tasks and materials to cover the scope of application for this unit.

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

This unit could be assessed in conjunction with any other units addressing the safety, quality, communication, materials handling, recording and reporting associated with lathe operations or other units requiring the exercise of the skills and knowledge covered by 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.

Required skills

Required skills include:

interpreting technical drawings/specifications in relation to turning

setting up jobs using appropriate equipment

calculating and setting cutting feeds and speeds appropriate to the job

checking that job is concentric and running true

safely operating lathes

performing turning operations

Required knowledge

Required knowledge includes:

sequence of operations to achieve the job requirements

tool type and geometry to achieve the required specifications and for work pieces of different materials

numerical operations, geometry and calculations/formulae within the scope of this unit

the consequences of varying speeds and feeds from the optimum rates calculated

characteristics of different materials and their effects on cutting speeds and feeds

application of lathe accessories

techniques, tools and equipment to measure materials and machined components

use and application of personal protective equipment

safe work practices and procedures

hazards and control measures associated with lathe operations

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.

Drawings

Drawings include engineering drawings to AS 1100/1102

Tooling

Tooling includes:

high speed steel, tungsten carbide, ceramic graphite and other standard cutting tools

boring bars

drills

reamers

thread chasers

tapping heads

taps

Instruments

Instruments may include:

manual and digital micrometers

vernier calipers

dial indicators

scribing blocks

Speeds and feeds

Speeds and feeds may include:

setting up machine

changing gears and speeds

use of lead screw

calculations

Accessories

Accessories may include:

three and four jaw chucks

centres

face plate

steadies

cross slide

tailstock

Turning operations

Turning operations may include:

manual parallel and taper turning

internal and external turning including boring drilling, reaming, single start thread cutting and parting off