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Noise management data sheets: cut off saw

Contents

  1. Introduction
  2. Maintenance
  3. Noise control
  4. Operator control
  5. Alternatives

1. Introducion

Portable cut off saws, cut off wheels and drop saws are high noise level machines. They are commonly used in the engineering area for cutting off lengths of metal. Noise levels produced are in excess of 100 dB(A) at the operator's ear. Good hearing protection is required.

2. Maintenance

  • Ensure blade cover does not rattle. Tighten if necessary. Also examine clamping accessories for wear.
  • Bearings in this type of machine need constant attention. Regular servicing of the machine with inspection of the carbon brushes and motor/gearbox bearings can save permanent and irreparable damage. If the bearings become worn excessive play becomes evident in the main shaft, which can jam work making the tool unsafe. To test for wear, grab the blade and attempt to wiggle it from side to side. There should be little or no play.

3. Noise control

  • Use special sound dampened blades instead of grinding disks for aluminium cutting.
  • Where possible, use machine outside, but beware of noise annoyance to adjacent spaces.
  • Use mobile screens to isolate area from adjacent work areas.
  • Try using rubber matting under the machine if used on a bench top. This will help prevent vibration transmission through the bench.

4. Operator control

  • Clamp all work securely prior to cutting. This is a safety procedure that also helps reduce noise.
  • Do not use excessive pressure when cutting. Allow more time and feed the blade into the cut.
  • Try to keep work at arms length from your body. The increased distance helps reduce noise at your ear. 

5. Alternatives

  • Use power hacksaws, metal cutting band saws or hand held reciprocating hack saws. Some slow cutting saws use a lot of leverage and a large induction motor. When purchasing cut off saws specify the type with the large induction motor as these are quieter. 

Adapted from the Noise Control Manual for Schools with the permission of the Education Department of Western Australia. 

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