Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners

MEM21012A Mapping and Delivery Guide
Service and repair mechanical watch oscillating systems

Version 1.0
Issue Date: May 2024


Qualification -
Unit of Competency MEM21012A - Service and repair mechanical watch oscillating systems
Description This unit of competency covers servicing and repair techniques and procedures for balance staff replacement of mechanical watch oscillating systems and components. It also includes workshop techniques for removal of balance staffs, rollers and balance springs. Additionally, this unit covers techniques for inspection, assessment and adjustment of balance wheel trueness and poise, balance spring, in-beat, oscillator end shakes and servicing of shock protection devices.
Employability Skills This unit contains employability skills.
Learning Outcomes and Application This unit of competency applies to service and repair work undertaken by a watch repair tradesperson on watch oscillating systems. Work would normally be undertaken in watch service and repair centres and jewellery stores where service and repairs are offered. This unit has been developed for watch service and repair apprenticeship training and the recognition of trade-level skills in watch servicing and repair. Band: AUnit weight: 4 points
Duration and Setting X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting.
Prerequisites/co-requisites MEM21009A Inspect, diagnose, adjust and repair mechanical watches MEM21008A Service mechanical watches MEM18001C Use hand tools
Competency Field
Development and validation strategy and guide for assessors and learners Student Learning Resources Handouts
Activities 		Slides
PPT 		Assessment 1 Assessment 2 Assessment 3 Assessment 4
Elements of Competency Performance Criteria              
Element: Identify oscillator types
  • Identify oscillating construction types and components
  • Establish the performance characteristics of the watch oscillating system
  • Record and document repair requirements
       
Element: Diagnose oscillator condition
  • Select and use workshop tools and equipment appropriately
  • Inspect oscillator components for condition, function, end shake and performance
  • Record and report wear and damage to component parts
  • Determine appropriate repair process to rectify faults
       
Element: Repair, replace and adjust oscillator components
  • Remove and reassemble balance complete and oscillator components using appropriate tools, equipment and techniques
  • Determine type and method of balance staff removal and replacement
  • Test security of replacement balance staff and oscillator components
  • Inspect condition and adjust balance wheel and oscillator components for correct operation
  • Determine type of roller and roller jewel and the method of removal and replacement procedures
  • Inspect, diagnose and adjust balance spring to achieve optimum performance and timekeeping
  • Inspect, service and replace components for shock protection devices fitted to mechanical oscillators
       
Element: Test and adjust oscillator
  • Verify and confirm function of watch movement
  • Correctly set up and operate mechanical watch timing machine and interpret readings
  • Verify watch performance and timekeeping
  • Adjust in-beat and rate, as required, according to performance and design characteristics
       


Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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 service, inspect and adjust mechanical watch oscillating systems, including balance staff replacement, to industry standards, manufacturer specifications and in accordance with safety regulations and procedures.

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

Assessors must be satisfied that the candidate can competently and consistently:

identify different types and grades of mechanical watch oscillating systems

diagnose faults in mechanical watch oscillating systems

inspect and repair faults in mechanical watch oscillating systems

repair a mechanical watch with broken or worn balance staff

inspect and adjust oscillator components for optimum performance.

Context of and specific resources for assessment

Assessment may occur on the job or in an appropriately simulated environment. Access is required to real or appropriately simulated situations, including work areas, materials and equipment, and information on workplace practices and OHS practices.

Where applicable, reasonable adjustment must be made to work environments and training situations to accommodate ethnicity, age, gender, demographics and disability.

Access must be provided to appropriate learning and/or assessment support when required. Where applicable, physical resources should include equipment modified for people with disabilities.

Method of assessment

Assessment must satisfy the endorsed Assessment Guidelines of the MEM05 Metal and Engineering Training Package.

Assessment methods must confirm consistency and accuracy of performance (over time and in a range of workplace relevant contexts) together with application of underpinning knowledge.

Assessment methods must be by direct observation of tasks and include questioning on underpinning knowledge to ensure its correct interpretation and application.

Assessment may be applied under project-related conditions (real or simulated) and require evidence of process.

Assessment must confirm a reasonable inference that competency is not only able to be satisfied under the particular circumstance, but is able to be transferred to other circumstances.

Assessment may be in conjunction with assessment of other units of competency where required.

Guidance information for assessment

Assessment processes and techniques must be culturally appropriate and appropriate to the language and literacy capacity of the candidate and the work being performed.

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

Required skills

Required skills include:

identifying types and grades of mechanical watch balance complete

removing and replacing balance staffs and rollers

truing balance wheels

poising balance wheels (static)

inspecting, diagnosing and adjusting balance springs

adjusting in-beat and rate

setting up and operating mechanical watch timing machine

Required knowledge

Required knowledge includes:

types and grades of balance wheel construction

types of balance staffs construction

types of balance spring construction

types of rollers and roller jewels construction

balance staff replacement techniques and workshop procedures

performance characteristics of balance wheel completes

balance spring adjusting techniques

watch servicing procedures and techniques

occupational health and safety (OHS) regulations and procedures

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.

Oscillator construction types

Oscillating construction types may include:

roskoph

nickel

glycudur

chronometer

2, 3, 4 arms

bi-metal compensating

annular

balance spring (e.g. flat and overcoil)

tourbillion

Performance characteristics

Performance characteristics may include:

timing, certified chronometer

effects of temperature, shocks, magnetism and position of wear

temperature compensation

Record and document repair

Record and document repair may include:

extent and date of repair

cost of replacement part

time spent on procedure

Workshop tools and equipment

Workshop tools and equipment may include:

hand tools

levers (e.g. balance spring)

roller removing tool

staking set

watchmaker's lathe

balance wheel truing tool

poising tool

figure of eight calipers

spirit lamp

presto roller jewel fitting tool

Oscillator components

Oscillator components may include:

balance wheel

balance spring

balance staff

roller

roller jewel

Type of construction

Type of construction may include:

balance staff (e.g. friction fitted, riveted and screwed)

roller (e.g. single table, double table, incabloc and two piece)

roller jewel shape (e.g. D shape, triangular and ellipitical)

balance spring (e.g. flat, overcoil, helical, spherical and conical)

Wear and damage

Wear and damage may include:

balance staff pivots bent, scored or worn

balance wheel out of true, damaged or enlarged hole

roller tables deformed or damaged

roller jewel cracked, chipped or missing

balance spring centred flat, at the cock and collet

Appropriate repair process

Appropriate repair process may include:

consideration of component cost and availability

replace balance complete

replace balance staff

repair or replace balance spring

repair or replace roller

dismantling and reassembling techniques

inspections adjustments of components

lubrication techniques, type and quantity

use of stop oil treatments (e.g. Epilame and Fixodrop)

Type and method of balance staff removal and replacement

Type and method of balance staff removal and replacement may include:

friction fit

riveted

screwed

turning rivet/hub on lathe

knock out staking set (e.g platax tool)

grinding molfre tool

shock-resistance (e.g. incabloc)

Correct operation

Correct operation may include:

balance staff secure fitting/tightness

roller aligned and secure

balance wheel true

balance wheel static poised

balance spring stud location in-beat

balance spring adjusting

balance staff end shakes

Type of roller and roller jewel

Type of roller and roller jewel may include:

single table

double table

two piece

shock-resistance (e.g. incabloc)

D shaped, triangular or elliptical roller jewels

Shock protection devices

Shock protection devices may include:

operating principles

components (e.g. jewels, endstones, combined setting and shock spring)

types of construction (e.g. incabloc, Kif, Seiko, Citizen and Wyler)

Watch performance

Watch performance may include:

in-beat 0.5 ms

amplitude (e.g. minimum 220 - 270 degrees, variations in positional errors)

rate +/- 5 - 10 seconds a day

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
Identify oscillating construction types and components 
Establish the performance characteristics of the watch oscillating system 
Record and document repair requirements 
Select and use workshop tools and equipment appropriately 
Inspect oscillator components for condition, function, end shake and performance 
Record and report wear and damage to component parts 
Determine appropriate repair process to rectify faults 
Remove and reassemble balance complete and oscillator components using appropriate tools, equipment and techniques 
Determine type and method of balance staff removal and replacement 
Test security of replacement balance staff and oscillator components 
Inspect condition and adjust balance wheel and oscillator components for correct operation 
Determine type of roller and roller jewel and the method of removal and replacement procedures 
Inspect, diagnose and adjust balance spring to achieve optimum performance and timekeeping 
Inspect, service and replace components for shock protection devices fitted to mechanical oscillators 
Verify and confirm function of watch movement 
Correctly set up and operate mechanical watch timing machine and interpret readings 
Verify watch performance and timekeeping 
Adjust in-beat and rate, as required, according to performance and design characteristics 

Forms

Assessment Cover Sheet

MEM21012A - Service and repair mechanical watch oscillating systems
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

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Assessment Record Sheet

MEM21012A - Service and repair mechanical watch oscillating systems

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

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