Forensic Engineers and Consultants

Tag Archive: machine design

  1. Harmless Appearing, Smooth Rotating Mixer Shaft Causes Serious Finger Amputation Injuries

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    I recently finished working on a case where an operator received a right hand injury when an unguarded, rotating mixer shaft caught his gloved hand between the right index finger and middle finger, twisting it around the shaft causing the index finger to separate from the hand and the middle and ring finger to be dislocated.  The mixer contained an unguarded rotating shaft, which created an uncontrolled motion hazard when rotating at speeds up to 450 RPM. (more…)

  3. Uncontrolled Hazards and Risk Assessments — Part One

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    Machine equipment manufacturers are called upon to study potential risks of equipment before selling it in the marketplace. In addition, ANSI machine tool standards further address equipment hazards and risks that cannot be eliminated by design. In one case I investigated, the depth of that critical risk assessment became an important factor in a claim involving a machinist blinded while using a computer numerically controlled (CNC) machining center. (more…)

  4. Hand and Finger Injuries from a Defective Snow Blower

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    Nearly everyone who lives in a snowy climate would agree that a gas powered snow blower beats a person powered snow shovel for clearing the sidewalk or driveway.  Shoveling heavy, wet snow causes injuries from back problems to heart attacks.  No wonder that gas powered snow blowers of all sizes are a popular item this time of year.  The larger ones may be ride-on types; smaller ones are typically walk-behind.  In either case there is an auger to gather the snow as the device moves forward and a bladed fan (or “blower”) to discharge it out of a chute to one side or the other.  (more…)

  5. Code Violations Are Root of Fatal Explosion

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    The design and installation of gas piping systems in homes and commercial buildings is guided by a set of regulations called NFPA 54 — the National Fuel Gas Code. The code, which establishes minimum safety requirements, is also used by forensic engineers to evaluate an explosion to determine cause and responsibility. (more…)

  6. Design Can Prevent Industrial Accidents

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    Two of the top causes of workplace accidents, according to the United States Department of Labor’s Occupation Safety and Health Administration, are a lack of machine guarding and improper control of hazardous energy. At first blush, these types of incidents can mistakenly be attributed to an employee’s actions without considering how a machine’s design or the improper control of an environment or situation may have contributed.
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  8. Machine Safeguarding for an Imperfect Workforce: Humans.

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    Every day more than 12 people in the United States lose their lives in workplace injuries, according to U.S. Department of Labor data. In 2011, OSHA estimates, 3.3 million people suffered a workplace injury from which they may never fully recover. Two of the top ten most frequently cited OSHA standards that result in injuries and death are lockout/tagout and machine guarding. (more…)

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