Noise Management in Woodworking Operations

Woodworking operations generate some of the highest noise levels of any manufacturing sector, with individual machines routinely producing 90 to 105 dB(A) during operation. The workplace exposure standard of 85 dB(A) LAeq,8h is exceeded in virtually every timber workshop during normal production, meaning noise-induced hearing loss is a near-certainty for workers without adequate protection and management programs. The combination of multiple machines operating simultaneously in enclosed workshop spaces creates a cumulative noise environment where workers away from machines are still exposed to levels above the standard from reflected and transmitted sound. Table saws and circular saws produce peak levels between 95 and 105 dB(A) depending on blade type, material, and feed rate. Thicknessers and planers generate sustained levels of 90 to 100 dB(A). Routers and spindle moulders at high RPM produce 95 to 105 dB(A). Pneumatic nail guns generate impulse noise peaks of 110 to 120 dB(A). The cumulative daily exposure from a typical combination of these machines readily exceeds the 85 dB(A) standard, even when individual task durations are relatively short.

A noise assessment must be conducted whenever there is uncertainty about whether workers are exposed above 85 dB(A) LAeq,8h or 140 dB(C) peak. In woodworking, the assessment should confirm that exposure exceeds the standard rather than determine whether it does, because exceedance is virtually guaranteed. The assessment must identify which tasks and machines generate the highest exposure levels, quantify the daily noise exposure for each worker or worker group, and establish which workers require hearing protection and audiometric testing. The assessment should be conducted using a calibrated Type 2 sound level meter for task-based measurements and personal noise dosimeters for workers who move between multiple tasks and areas during their shift. Results must be documented in a noise assessment report that includes measurement methodology, instrument calibration records, measurement locations and durations, results in dB(A) LAeq and dB(C) peak, calculated daily noise exposure for each worker group, and recommendations for control measures. The noise assessment must be reviewed whenever there is a change to work processes, equipment, or work layout that could affect noise levels, and should be repeated at least every five years even without changes to confirm ongoing accuracy.

The hierarchy of controls requires PCBUs to implement engineering and administrative controls before relying on hearing protection. In woodworking, practical engineering controls include selecting low-noise saw blades with anti-vibration slots and dampening coatings, installing machine enclosures on the noisiest plant items, fitting vibration-damping mounts to reduce structure-borne noise transmission, installing acoustic barriers between high-noise and lower-noise work areas, and maintaining machine components that increase noise when worn — including bearings, belts, and cutter blocks. Administrative controls include scheduling the noisiest operations at times when fewer workers are present, rotating workers between high-noise and lower-noise tasks to reduce individual daily exposure, and establishing mandatory hearing protection zones with clear signage around machines exceeding 85 dB(A). While these controls can reduce overall exposure, they rarely eliminate the need for hearing protection in woodworking environments. The sustained high noise levels produced by timber machining operations mean that hearing protection remains a necessary component of the noise management program even after engineering controls are optimised. The value of engineering controls is in reducing the reliance on hearing protection rather than eliminating it entirely.

Audiometric testing must be provided to all workers whose daily noise exposure exceeds 85 dB(A), which in practice means all production workers in timber processing operations. Baseline audiometry should be conducted before or within three months of first exposure to noise at work, and subsequent tests must be conducted at intervals not exceeding two years. The testing must be performed by a qualified audiometrist using a calibrated audiometer in a testing environment that meets background noise requirements. Results must be compared against the baseline to identify any noise-induced threshold shift. A standard threshold shift of 10 dB or more at 2000, 3000, or 4000 Hz in either ear, averaged, indicates early noise-induced hearing loss that requires investigation and action. When a threshold shift is identified, the PCBU must review the adequacy of existing controls, verify that the worker is using hearing protection correctly and consistently, assess whether the hearing protection provides adequate attenuation for the exposure level, and refer the worker to an audiologist for further assessment if clinically indicated. Audiometric records must be retained for the duration of the worker's employment plus 30 years. Workers must be informed of their results and given a copy of each test report. Annual review of audiometric data across the workforce can identify trends that indicate systemic inadequacy of the noise management program.