This unit applies to complex, difficult or non-standard turning e.g. single-start and multi-start thread cutting, internal blind hole thread cutting, eccentrics, copy and taper turning, counterbalancing work on face plates, mandrel work, trepanning, heavy (multi-tonne) shafts etc. requiring high precision or quality using a range of materials including non-standard metals and alloys.

Work would be performed autonomously using predetermined standards of quality and safety.

Band: A

Unit Weight: 4

Path 1

MEM07005C

Perform general machining

MEM07006C

Perform lathe operations

MEM09002B

Interpret technical drawing

MEM12003B

Perform precision mechanical measurement

MEM12023A

Perform engineering measurements

MEM12024A

Perform computations

MEM18001C

Use hand tools

ELEMENT

PERFORMANCE CRITERIA

1. Determine sequence of operations

1.1. Sequence of operations including job set-up is determined for maximum efficiency and to meet job specifications.

2. Set up work on lathe

2.1. Work is set up on the lathe to required level of accuracy using precision instruments such as dial test indicators etc.

2.2. Work piece is balanced as required when using face plates to ensure accuracy in machining.

2.3. Work piece is set up to ensure that work piece is free of distortion following completion of machining.

3. Select and prepare tooling

3.1. Tooling, accessories and consumables are selected appropriate to task, specifications and material.

3.2. Where necessary, cutting tool modifications required to perform complex turning operations are determined.

3.3. Tooling and accessories are prepared and modified as required.

3.4. International Standard Organisation standards for cutting tools or other appropriate standards to suit cutting parameters are applied as necessary.

4. Perform complex turning

4.1. Speeds and feeds are correctly calculated using appropriate mathematical techniques and reference material.

4.2. Complex turning is undertaken to specifications and workplace procedures.

4.3. Work piece is measured and verified to be in accordance with specification using precision measuring equipment.

Required skills

Look for evidence that confirms skills in:

setting up work to the required level of accuracy using appropriate precision measuring equipment

setting and supporting work to avoid distortion on release of clamping devices

selecting correct cutting tools or inserts as appropriate to turning operation

selecting and using appropriate feeds and speeds

performing complex turning operations - counter balancing work on face plates:

mandrel work

trepanning

heavy (multi-tonne) shafts

calculating cutting parameters, speeds and feeds

reading, interpreting and following information on written job instructions, specifications, charts, lists, drawings and other applicable reference documents

planning and sequencing operations

checking and clarifying task related information

entering routine and familiar information onto proformas and standard workplace forms

checking for conformance to specifications

using precision measurement equipment

measuring components to specified tolerances

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

following oral instructions

orally reporting information

Required knowledge

Look for evidence that confirms knowledge of:

precision measuring equipment and measuring techniques within the scope of this unit

reasons for selecting different measuring equipment

procedures for accurately setting up work for a variety of techniques

ISO or other standards applicable to cutting tool inserts

cutting parameters for the given task

feeds and speeds for complex turning operation(s)

formulae and data relating to feeds and speeds

techniques and procedures for carrying out the following turning operations:

single-start thread cutting

multi-start thread cutting

internal blind hole thread cutting

eccentrics

copy turning

taper turning

techniques and procedures for carrying out the following turning operations:

counter balancing work on face plates

mandrel work

trepanning

heavy (multi-tonne) shafts

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 perform complex lathe operations. 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 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 performing complex lathe operations 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 specifications, 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.

Lathe

Applicable to all classes of lathes used for complex turning operations

Tooling

Cutting tools, form tools, boring bars, drills, reamers, thread chasers, tapping heads, taps etc.

Complex turning

May include single-start and multi-start thread cutting, internal blind hole thread cutting, eccentrics, copy and taper turning, counterbalancing work on face plates, mandrel work, trepanning, heavy (multi-tonne) shafts etc.

Unit sector

Machine and process operations

This unit contains employability skills.