Assessor Resource

MEM21012
Service and repair mechanical watch oscillating systems

Assessment tool

Version 1.0
Issue Date: May 2024


This unit of competency defines the skills and knowledge required to apply service and repair techniques and procedures for balance staff replacement of mechanical watch oscillating systems and components.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

Band: A

Unit weight: 4

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, 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.

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.

Oscillator construction types include one (1) or more of the following:

roskoph

nickel

glycudur

chronometer

2, 3, 4 arms

bi-metal compensating

annular

balance spring

tourbillion

Oscillator components include one (1) or more of the following:

balance wheel

balance spring

balance staff

roller

roller jewel

Performance characteristics include one (1) or more of the following:

timing and certified chronometer

effects of temperature, shocks, magnetism and position of wear

temperature compensation

Record and document repair includes one (1) or more of the following:

extent and date of repair

cost of replacement part

time spent on procedure

Workshop tools and equipment include the following:

hand tools

levers

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 include one (1) or more of the following:

balance wheel

balance spring

balance staff

roller

roller jewel

Type of construction includes one (1) or more of the following:

balance staff:

friction fitted

riveted

screwed

roller:

single table

double table

incabloc

two piece

roller jewel shape:

D shape

triangular

elliptical

balance spring:

flat

overcoil

helical

spherical

conical

Wear and damage includes one (1) or more of the following:

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 includes one (1) or more of the following:

consideration of component cost and availability

replace balance complete and balance staff

repair or replace balance spring and roller

dismantling and reassembling techniques

inspections adjustments of components

lubrication techniques, type and quantity

use of stop oil treatments

Type and method of balance staff removal and replacementincludes one (1) or more of the following:

friction fit

riveted

screwed

turning rivet/hub on lathe

knock out staking set

grinding molfre tool

shock-resistance

Correct operation includes one (1) or more of the following:

balance staff secure fitting/tightness

roller aligned and secure

balance wheel true and static poised

balance spring stud location in-beat

balance spring adjusting and balance staff end shakes

Type of roller and roller jewel includes one (1) or more of the following:

single and double tables

two piece, shock-resistance

D shaped, triangular or elliptical roller jewels

Components of shock protection devices include one (1) or more of the following:

jewels

endstones

combined setting

shock spring

Watch performance includes one (1) or more of the following:

in-beat 0.5 ms

amplitude (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
Follow standard operating procedures (SOPs) 
 
 
 
Identify oscillating construction types and components 
 
 
Select and use appropriate workshop tools and equipment 
 
 
 
Remove and reassemble balance complete and oscillator components using appropriate tools, equipment and techniques 
 
 
 
 
 
 
Verify and confirm function of watch movement 
 
 
 

Forms

Assessment Cover Sheet

MEM21012 - 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:

Signature:

Date:

Assessment Record Sheet

MEM21012 - 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

Assessor name:

Signature:

Date:

Student signature:

Date: