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The blades were recessed into the edger machine. There was evidence that the highest point of the blades was about 300 millimetres below the top of the machine. Therefore a worker's hand could come into contact with a moving blade only if it was inserted that far, or somehow pulled that far, into the machine.
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There was evidence that Mr Barwick knew that he should not attempt to clear sawdust blockages in the vicinity of the blades until he had turned the power off and then waited 55 seconds for the blades to stop turning.
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There was evidence that he would be able to tell when the blades had stopped turning not just by looking at them, but also by seeing whether a drive belt above the blades had stopped moving, and/or whether a fan in a motor above the blades had stopped rotating. Also, if sawdust was being blown into the air above the blades, that was an indication that they were still in motion. However a lack of sawdust in the air was not a reliable indication of them not being in motion.
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There was evidence that the edger and other machines built to the same design had been in use for about 30 years at several other Tasmanian sawmills, and at some on the mainland. There was evidence from two witnesses that they had seen several such machines in operation, and that none of them had any sort of safety guard to inhibit access to the recessed blades.
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After the investigation of Mr Barwick's accident by officers of Workplace Standards Tasmania, no action was taken to compel the operators of identical machines in Tasmania to install safety guards.
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The applicant's production manager, who was in charge of the day to day production activities at the sawmill, gave evidence that the edger had been installed there about three to four years before Mr Barwick's accident; that he had been working at the sawmill since some time prior to its installation; and that no concerns had been expressed by anyone as to its safety. He gave evidence that a safety audit had been undertaken when the machine was commissioned.
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There was evidence that the safety guard and timer switch installed after Mr Barwick's accident cost about $2,000 to $3,000.
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The nature of the safety guard was such that a determined individual would be able to get over or under it at any time.