Elements and Performance Criteria
- Prepare for maintenance
- Assess saw condition
- Follow organisational safety procedures thoughout all maintenance and repair processes.
- Remove wide band and gang saws from machinery.
- Handle saws to avoid damaging teeth.
- Clean foreign material on blade surfaces for inspection.
- Inspect saw to assess condition of teeth, tips and saw blade.
- Check and mark teeth or 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.
- Level, tension and back-gauge saw blade
- Assess and match 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 levelling and use stretcher or levelling rolls to flatten.
- Localise stresses using controlled levelling or rolling patterns 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.
- Repair teeth and blade cracks
- Place saw blade in welding jig for heat application and welding activities.
- Check amount of damaged tooth to be removed or crack to be repaired and mark weld line.
- Remove metal to proposed line, prepare 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 or cracked area using material and prcoesses that ensure specified metal penetration and density.
- Use weld run-off tabs to limit stress and hollows at edges of saw blade.
- Grind or file teeth or cracks to required shape, tolerance and pitch.
- Dispose of saws with irreparable teeth, tips or blades in line with organisational procedures environmental protection practices.
- Identify routine processing and equipment faults and resolve or report to appropriate personnel.