AH 3574 Lecture Notes - Lecture 9: Machine Tool, Human Factors And Ergonomics, Pliers
Document Summary
If not considered, benefits of selecting and using ergonomic tooling are compromised. Where"s the evidence: measures of forceful exertions, awkward postures, and contact stresses for ergonomics hand tools tend to be lower compared to the same measures for the equivalent standard versions of the same tool, according to some studies. Handle thickness: goal, minimize grip force, power grip, larger diameter, optimal diameter, 1 - 2 inches, too large. Increased force required: too small, precision grip. Increased force required: smaller diameters, optimal thickness, - inch, work gloves can reduce hand strength <30, higher grip force required to hold onto handle. Handle angle: goal, maintain wrist in a neutral posture, for horizontal forearm motion, a bent handle works well, for vertical movements, a straight handle is usually the best choice. Powered tools: trigger operated by 2 or > fingers preferred, vibration dampening engineered into tools.
