This unit of competency applies to servicing and repair work on mechanical clock chiming mechanisms undertaken in clock service and repair workshops.

This unit has been developed for watch and clock service and repair apprenticeship training and the recognition of trade-level skills in watch and clock servicing and repair.

Band: A

Unit weight: 6 points

MEM21019A

Service and repair clock striking mechanisms

MEM21017A

Service and repair clock timepieces

ELEMENT

PERFORMANCE CRITERIA

1. Establish servicing requirements and liaise with customer

1.1. Identify functions and types of chiming system

1.2. Verify clock condition and performance concerns with customer

1.3. Prepare written and verbal quotations

1.4. Agree with customer on recommended service procedures

1.5. Prepare clock for handover

1.6. Record and document repair process

1.7. Source replacement parts from industry suppliers

2. Service and repair chiming mechanisms

2.1. Remove and replace movement considering case design and chiming system employed

2.2. Confirm design and operation of the chime corrector mechanism

2.3. Determine service procedure for particular movement design

2.4. Inspect condition of chime release, activation and sound generation, and identify wear and faults

2.5. Dismantle and clean chiming components

2.6. Verify orientation of gear trains, strike and chime detents

2.7. Confirm servicing and repair requirements

2.8. Repair and rectify faults in chiming components

2.9. Reassemble chiming mechanism and verify correct setup, operation and performance

2.10. Select and apply lubricants to chime components

3. Bench test and adjust chime functions

3.1. Verify and confirm function of chiming mechanism

3.2. Verify clock operation over 24 hour period

3.3. Determine and rectify faults in chiming mechanism

4. Apply industry workshop standards to perform work

4.1. Use hand and bench tools and equipment safely and correctly

4.2. Establish appropriate working environment

4.3. Handle components without damaging or marking

4.4. Establish a clean and safe work environment

Required skills

Required skills include:

identifying country of origin with respect to count wheel or locking plate chiming mechanism

identifying various mechanical clocks by chiming features

dismantling and reassembling chiming clock assemblies and movements

identifying and rectifying wear and faults in chiming systems

setting up chiming mechanisms for correct warning and chime corrector operation

setting up and synchronising chime tunes for correct resonant sound generation

lubrication including selecting and applying correct amount, type, cleanliness and point of application

Required knowledge

Required knowledge includes:

types of clock chiming systems and chime correcting mechanisms

differences between designs from various manufacturers

application of gong rod, bells and hammers to achieve correct resonant sound generation

dismantling and reassembling techniques for chiming mechanisms

correct amount of warning and chime corrector operation

fault-finding techniques for ensuring chime does not impact on clock operation

occupational health and safety (OHS) regulations 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 service mechanical chiming clocks 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:

dismantle and reassemble clocks with chiming mechanisms

fault-find clocks with chiming mechanisms

repair/replace worn or damaged components

perform correct set-up, operation and performance testing on chiming clocks

adjust chiming clock mechanisms for correct operation/synchronisation with hands and sound generation/tonality

apply lubrication techniques (e.g. correct type and amount)

diagnose faults relating to chime mechanisms

verify operation of chime correctors.

Context of and specific resources for assessment

Assessment may occur on the job or in a simulated working 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.

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.

Functions and types of chiming system

Functions and types of chiming system may include:

chiming clocks of various movement design (e.g. count wheel or locking plate, rack or combinations of control systems)

long case and mantle clocks

motive force (e.g. mainsprings or weights)

gear trains (e.g. components of each train)

chime release mechanism (e.g. control functions - chime and strike)

chime and strike fans (e.g. control speed of trains)

hand setting and synchronisation with chimes and strike

winding systems in chiming clocks

night shut-off switch types

chime correcting mechanisms

types of chimes by hammers and sequences for tunes (e.g. 4 or 8 hammer)

tunes played (e.g. Westminster, St. Michaels and Whittington)

chiming media (e.g. gongs, tubes and bells)

Record and document repair process

Record and document repair process may include:

date and extent of repair

cost of replacement parts

time spent on procedure

Design and operation of chiming corrector mechanism

Design and operation of chiming corrector mechanism may include:

double detent

spring loaded catch

rocking locking plate

bell crank

pivoted detent

Inspect condition

Inspect condition may include:

originality of components

corrosion

cleanliness

wear

hand setting tension

function and safety of winding mechanism

gear train end shake/backlash/lubrication

mainspring engagement/hooking/tension/ lubrication

adjustment of chime and striking functions

verification of chime corrector functions

synchronised chime release with operations of hands at the four quarters

amount of warning for chime train

strike release mechanism operation

sound of chimes and strike monitored

gong rods, bells, tubes alignment and security including attachment to case

hammer head inserts (e.g. condition - worn or aged)

Chime components

Chime components may include:

four quarter cam

lifter

chime flirt or detents

strike flirt or detent

chime locking plate

chime corrector

chime gear train (e.g. warning wheel)

ratio wheel (e.g. transmission)

chime pin barrel

gong rods, bells and tubes

hammers

Faults in chime components

Faults in chime components may include:

mounting security (e.g. gong rods, bells and tubes)

warning and locking pin security and detent mountings

hammer condition

worn arbors and bearings

broken or worn chime components

Correct set-up

Correct set-up may include:

synchronised chime release with hands

amount of warning

chime corrector operation

correct tune sequence

sounds of chime

Hand tools and equipment

Hand tools and equipment may include:

clock repairers' hand tools (e.g. tweezers, screwdrivers and eyeglasses)

universal shifter, sockets and spanners

pliers, end cutters, files and levers

movement holders, stands and wall brackets

stakes for supporting removal/replacement of components (e.g. gathering pallet, cannon pinions and chime locking plate)

lathe for pivot and arbor repairs and finishing

clock bushing tool and replacement bushes

lubrication (e.g. oiler, oil pots and greases)

hand cleaning (e.g. pith, peg wood and rodico solvents jar)

Appropriate working environment

Appropriate working environment may include:

clean bench and working area

adequate lighting and ventilation

tools and equipment organised and in good condition

ergonomic seating, including bench height

Clean and safe work environment

Clean and safe work environment may be specified through:

relevant legislation and regulations

enterprise operating procedures

5S housekeeping related principles and procedures (e.g. sort, straighten, shine, standardise, sustain)

Unit sector

Horology

This unit contains employability skills.