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Elements and Performance Criteria

1. Prepare for maintenance
   • Review work order and where required check with appropriate personnel.
   • Select appropriate repair, maintenance and personal protective equipment and check for operational effectiveness in line with manufacturer's recommendations.
   • Plan repair process in line with work order.
2. Assess saw condition
   • Follow organisational safety procedures throughout all maintenance and repair processes.
   • Remove frame saw blades from machinery.
   • Handle saws to avoid damaging teeth.
   • Clean foreign material on saw surfaces for inspection.
   • Inspect saw to assess condition of teeth and saw blade.
   • Check and mark teeth and tips requiring repair or replacement.
   • Declare saw unserviceable where hazardous defects are found.
   • Segregate and dispose of unserviceable saws in line with organisational procedures and environmental protection practices.
3. Hammer, tension and back-gauge saw blade
   • Assess ridges or lumps across and along saw on both sides of blade.
   • Use gauges and straight edges in both directions to test blade accuracy.
   • Remove ridges or lumps progressively through hammering and use stretcher or levelling rolls to flatten.
   • Control hammering or rolling patterns to localise stresses to avoid spring-back and re-occurrence of defects.
   • Check saw blade against required curvature using a gauge to identify tensioning requirements.
   • Obtain tension curvature across and along saw blade.
   • Check alignment of saw back against tolerances using a gauge; roll non-conforming areas to obtain required tolerance.
4. Repair teeth
   • Place saw blade in welding jig for heat application and welding activities.
   • Check amount of damaged tooth to be removed and mark weld line.
   • Remove metal to proposed line, prepare metal edge for welding and clean burn marks.
   • Apply heat and pressure to prepare worn, broken or ground surface for metal build up or replacement.
   • Build up or replace teeth using material and processes that ensure specified metal penetration and density.
   • Use weld run-off tabs to limit stress and hollows at saw edges.
   • Grind or file teeth to required shape, tolerance and pitch.
   • Dispose of sub-standard saw blades in line with environmental protection practices.
   • Identify routine processing and equipment faults and resolve or report to appropriate personnel.

Range Statement

Not Applicable

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Performance Evidence

A person demonstrating competency in this unit must satisfy all of the elements, performance criteria and foundation skills of this unit. If a specific volume or frequency is not stated below, then evidence must be provided that the following requirements have been performed on at least one occasion:

follow organisational policies and procedures relevant to maintaining frame saw blades

maintain frame saw blades in line with a work order and within prescribed organisational requirements

remove and replace saws from equipment

assess saw condition in line with standard operating procedures

use welding processes and materials to produce:

welds which provides enough penetration to ensure strong cohesion

density that ensures the weld is free of holes and inclusions.

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Knowledge Evidence

A person competent in this unit must be able to demonstrate knowledge of:

purpose, features and operation heavy duty frame saws for which repairs are completed

features and names of different parts of frame saw blades

purpose, features and operation of tools and equipment used to repair and maintain frame saw blades:

hammers

structure rolls

levelling rolls

tensioning instruments

gauges and straight edges

welding equipment and welding materials

importance of levelling blades, setting tension, applying curvature and setting teeth to match requirements for:

characteristics of various materials sawn

speed of the sawing process

direction of the sawing process

cutting angle for sawing

saw blade specifications

methods for:

removing saw blades from heavy duty frame saws

assessing saw blade condition

hammering, levelling and tensioning blades to specified requirements

applying curvature

welding to build up and replace teeth

grinding and filing teeth to required shape, tolerance and pitch

characteristics of metal used in frame saw blades and range of force which can be applied without damaging blades

organisational procedures specific to maintaining frame saw blades:

workplace health and safety with particular emphasis on equipment lock out and use of personal protective equipment

communication reporting lines

recording and reporting processing and equipment faults

environmental protection practices for repairing and maintaining tools and equipment in forest products factory settings:

reducing water and energy use

cleaning plant, tools and equipment

disposing of, recycling and reusing materials

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