Human Factors/Ergonomics

Consider the following job design in which boxes come in on conveyor A and a male worker lifts and carries them to conveyor C, then the boxes move to next workstation.

1. Calculate the recommended weight for the job described here to minimize the risk of musculoskeletal injury to the worker.

2. Suggest at least three different changes to redesign the job.

3. What are the pros and cons for each suggestion you provided in previous part?

Here is the list of basic information:

Boxes:
–   Size:       45 x 45 x 45 cm
–   Weight:   the variable you need to determine.
–   Coupling:   open slot in the middle of each side

Worker:
–   Gender:   male
–   Age:       36 years old
–   Height:       170 cm
–   Weight:   68 kg
–   He carries the boxes by holding them with horizontal forearms.

Conveyor A:
–   Height of conveyor:       15 cm
–   Angle:               90 degrees to the left of worker
–   Speed:               one box every 45 seconds

Material Handling B:
– Carrying distance: 5 yards

Conveyor C:
–   Height of conveyor:       70 cm
–   Angle:               90 degrees to the right of worker
–   Speed:               one box every 30 seconds

Other information:
– Task duration: 60 min.
– Environment temperature: 28 oC

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