NZQA registered unit standard
23439 version 2
Page 1 of 6
Title
Identify, diagnose, and rectify saw centre problems
Level
5
Credits
25
Purpose
People credited with this unit standard are able to identify,
diagnose, and rectify: saw blade problems; saw centre and set
work alignment problems; saw centre mechanical condition
problems; saw centre set-up problems; and raw materials and
saw centre operational problems that impact on the efficiency
of the saw centre.
Classification
Solid Wood Manufacturing > Saw Doctoring
Available grade
Achieved
Entry information
Recommended skills
and knowledge
Prerequisite: National Certificate in Solid Wood Manufacturing
(Advanced) with strand in Saw Doctoring (Level 4) [Ref: 1307];
or demonstrate equivalent knowledge and skills.
Explanatory notes
1
The following apply to the performance of all outcomes of this unit standard:
a
All work practices must meet recognised codes of practice and documented
worksite health and safety and environmental requirements (where these
exceed the code) for personal, product, and worksite health and safety, and
must meet the obligations required under current legislation, including the
Health and Safety in Employment Act 1992, the Resource Management Act
1991, and their subsequent amendments.
b
All work practices must meet documented worksite operating procedures. This
includes the recording (by electronic or non-electronic means) of activities,
events, and decisions.
c
All evidence of communications gathered in relation to this unit standard must
be in accordance with worksite procedures for content, recipient, timing, and
method.
2
Problems identified, diagnosed and rectified for all outcomes of this unit standard
must be critical in terms of their potential to adversely affect productivity and quality
standards.
3
The reference text for this unit standard is Williston, E, Saws: Design, Selection,
Operation, Maintenance (2nd ed.) (San Francisco: Miller Freeman, 1989), available
from Competenz, PO Box 9005, Newmarket, Auckland 1149.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3
23439 version 2
Page 2 of 6
Definitions
Root cause analysis refers to the systematic analysis of causes associated with a
problem until the one that will eliminate the problem is identified.
Worksite policies and procedures refer to documented policies and to documented or
other directions provided to staff. These include, but are not limited to, ways of
managing health and safety, environmental considerations, quality, and production,
and must conform to legislation. Examples include standard operating procedures,
company health and safety plans, on-site briefings, and supervisor’s instructions.
Outcomes and evidence requirements
Outcome 1
Identify, diagnose, and rectify saw blade problems that impact on the efficiency of the saw
centre.
Range
causes of saw blade problems may include but are not limited to:
circular saws – saw throwing sawdust from the back, saw heating in the rim
area, saw heating in the inner area, saw pounds or chatters at the guides,
cracks at the collar or spacer contact zone, gullet cracking;
bandsaws – saw overheats, saw dishes, saw vibrates, saw oscillates on wheels,
saw twists, saw develops cracks;
stellite tips – poor bond, tip breakage in use, chill line breakage, gullet cracks;
carbide tips – tip loss, chill line breaks, dubbed carbide tooth face or side,
carbide heat cracks or checks.
Evidence requirements
1.1
Sawn product defects that may arise from saw blade problems are described in
accordance with the reference text.
1.2
Saw blade problems are identified for a given saw centre, using sawn product,
plant observation, and plant data.
Range
evidence for two saw blade problems is required.
1.3
Saw blade problems identified in evidence requirement 1.2 are investigated,
and a diagnosis for each problem is made using root cause analysis.
1.4
Corrective actions to rectify saw blade problems are implemented in
accordance with the diagnoses in evidence requirement 1.3.
1.5
Corrective actions implemented in evidence requirement 1.4 rectify the saw
blade problems investigated in evidence requirement 1.3.
1.6
Communication with management and operational staff regarding
implementation of corrective actions is completed in accordance with worksite
policies and procedures
Outcome 2
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
23439 version 2
Page 3 of 6
Identify, diagnose, and rectify saw centre and set work alignment problems that impact on
the efficiency of the saw centre.
Range
causes of saw centre and set work alignment problems may include but are not
limited to – out of squareness, out of plumb, level and straightness of all saw
centre components to the travel of timber through the saw centre; misalignment
of carriage and saw; misalignment of saw and bed or fence to resaw;
misalignment of rollers to arbour of edger; misalignment of saws and sharp
chain; misalignment of slabbers to travel of log, cant or board.
Evidence requirements
2.1
Sawn product defects that may arise from the saw centre and set work
alignment problem are described in accordance with the reference text.
2.2
A saw centre and set work alignment problem are identified for a given saw
centre, using sawn product, plant observation, and plant data.
2.3
The saw centre and set work alignment problem identified in evidence
requirement 2.2 is investigated and a diagnosis for each problem is made using
root cause analysis.
2.4
Corrective actions to rectify the saw centre and set work alignment problem are
implemented in accordance with the diagnoses in evidence requirement 2.3.
2.5
Corrective actions implemented evidence requirement 2.4 rectify the saw centre
and set work problem investigated in evidence requirement 2.3.
2.6
Communication with management and operational staff regarding
implementation of corrective actions is completed in accordance with worksite
policies and procedures
Outcome 3
Identify, diagnose, and rectify saw centre mechanical condition problems that impact on
the efficiency of the saw centre.
Range
causes of saw centre mechanical condition problems may include but are not
limited to damage or wear to – drives, drive belts, arbors, bearings, guides,
collars, bandwheels, log carriage components, bed rollers/chains, set works,
strain systems, lubrication systems.
Evidence requirements
3.1
Sawn product defects that may arise from saw centre mechanical condition
problems are described in accordance with the reference text.
3.2
A saw centre mechanical condition problem is identified for a given saw centre,
using sawn product, plant observation, and plant data.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
23439 version 2
Page 4 of 6
3.3
The saw centre mechanical condition problem identified in evidence
requirement 3.2 is investigated and a diagnosis for each problem is made using
root cause analysis.
3.4
Corrective actions to rectify the saw centre mechanical condition problem are
implemented in accordance with the diagnoses in evidence requirement 3.3.
3.5
Corrective actions implemented in evidence requirement 3.4 rectify the saw
centre mechanical condition problem investigated in evidence requirement 3.3.
3.6
Communication with management and operational staff regarding
implementation of corrective actions is completed in accordance with worksite
policies and procedures
Outcome 4
Identify, diagnose, and rectify saw centre set-up problems that impact on the efficiency of
the saw centre.
Range
causes of saw centre set-up problems may include but are not limited to –
incorrect roller pressures, incorrect bandsaw guide pressures, guide wear,
incorrect edger guide clearances, incorrect guide set-ups, incorrect tracking of
bandsaw bandwheels, worn scrapers, worn shear plates, incorrect strain
settings and set-up, incorrect lubrication rates, incorrect or not saw lubricants.
Evidence requirements
4.1
Sawn product defects that may arise from saw centre set-up problems are
described in accordance with the reference text.
4.2
A saw centre set-up problem is identified for a given saw centre, using sawn
product, plant observation, and plant data.
4.3
The saw centre set-up problem identified in evidence requirement 4.2 is
investigated and a diagnosis for each problem is made using root cause
analysis.
4.4
Corrective actions to rectify saw the centre set-up problem are implemented in
accordance with the diagnoses in evidence requirement 4.3.
4.5
Corrective actions implemented in evidence requirement 4.4 rectify the saw
centre set-up problem investigated in evidence requirement 4.3.
4.6
Communication with management and operational staff regarding
implementation of corrective actions is completed in accordance with worksite
policies and procedures
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
23439 version 2
Page 5 of 6
Outcome 5
Identify, diagnose, and rectify raw material supply and operational problems that impact on
the efficiency of the saw centre.
Range
causes of raw materials supply problems may include but are not limited to –
moisture content, log specification, dimensions, tree age, density, species,
compression wood, tension wood, grain, storage time after felling, sweep, butt
flare, foreign objects/matter, internal and external log damage;
operational problems may include but are not limited to – feed speed and depth
of cut relationship errors, material alignment to the saw centre, presentation of
material to the saw centre, movement of material or equipment during cutting.
Evidence requirements
5.1
Sawn product defects that may arise from materials supply and saw centre
operational problems are described in accordance with the reference text.
5.2
A saw centre raw materials supply, and operational problem is identified for a
given saw centre, using sawn product, plant observation, and plant data.
5.3
The saw centre raw materials supply, and/or operational problem identified in
evidence requirement 5.2 is investigated and a diagnosis for each problem is
made using root cause analysis.
5.4
Corrective actions to rectify the saw centre raw material supply and/or
operational problem are implemented in accordance with the diagnoses in
evidence requirement 5.3.
5.5
Corrective actions implemented in evidence requirement 5.4 rectify the saw
centre raw material supply, and/or operational problem investigated in evidence
requirement 5.3.
5.6
Communication with management and operational staff regarding
implementation of corrective actions is completed in accordance with worksite
policies and procedures.
Planned review date
31 December 2016
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
18 December 2006
31 December 2013
Review
2
21 June 2012
N/A
Consent and Moderation Requirements (CMR) reference
0173
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
23439 version 2
Page 6 of 6
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Competenz at info@competenz.org.nz if you wish to suggest changes
to the content of this unit standard.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016