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 precision micro-mechanism diagnosis and servicing. 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 preparing precision micro-mechanism diagnosis and servicing 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 should not require language, literacy and numeracy skills beyond those required in this unit. 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

Required skills

Look for evidence that confirms skills in:

eliminating/minimising effects of internal external/external influences

judging adequacy of accuracy

making timing adjustments include balance spring, dynamic poising, static poising, truing balance (flat and round)

making detailed observations using high-magnification optics

testing functioning of components to high tolerances including the functioning of escapement and oscillating system

removing and replacing assembly and subassembly components including balance staff, pallet staff, pallet jewels and other precision components

adjusting pallet jewels, safety action of escapement, poise of balance, manipulation of balance spring to minimise error in performance

tensioning chronograph wheel and minute wheel

observing and adjusting depth of engagement and operating sequence of functioning elements

applying lubrication

alignment of hands with dial

re-finishing and matching components to existing components to ensure correct functioning

fitting and adjusting new and repaired components to function within existing system

Required knowledge

Look for evidence that confirms knowledge of:

physical limitations and condition of system and control factors influencing isochronism

inherent influences in design, internal and external influences on rating variation

adjustment procedures/techniques

detailed inspection and analysis techniques for diagnosing precision micro-mechanisms

acceptable tolerances, clearances and limits for precision components

components suitable for precision outcomes

effects of adjustment on performance and operation

criteria for correct adjustment of balance spring and regulating system

types of chronograph mechanisms and their functioning

adjustment procedures for chronograph operation, including minute and hour recording systems

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.

Micro-mechanisms

Mechanical and electric precision watches and clocks of recent manufacture, or restoration pieces. Includes chronometer timepieces. May include day/date, automatic winding or generating systems. Clock mechanisms may include alarm, striking and chiming mechanisms

Repair/servicing requirements

Repairs and timing adjustments include balance spring, dynamic poising, static poising, truing balance (flat and round)

Repair and adjustment of chronograph mechanisms to ensure correct operation of seconds, minute and hour recording systems

Tools and equipment

Range of precision mechanical/electronic tools and high-tolerance testing equipment for detailed observation diagnosis and servicing. Includes specialist service tools for adjusting oscillating systems and chronograph mechanisms

Precision components

Timekeeping elements, including balance staff, pallet staff, pallet jewels, wheel trains and other precision components

Power source, mechanical oscillating systems, motion work, calendar systems

Specifications

Precision adjustment performed to detailed manufacturer specifications and tolerances

Account made of inherent influences in design, internal and external influences on rating variation

Tests

Observations of high-tolerance clearances, fits and adjustments and functioning

Operation of systems and performance analysis