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D-Lab Design for Human Use. Ergonomics. Ease of use Ease of maintenance Number of interactions Novelty of interactions Safety. Battery Maintenance. Design for as many target users as possible. Consequences of bad design. Ergonomics. Ease of use Ease of maintenance
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Ergonomics • Ease of use • Ease of maintenance • Number of interactions • Novelty of interactions • Safety
Ergonomics • Ease of use • Ease of maintenance • Number of interactions • Novelty of interactions • Safety
Micro-Flail Time and Motion Comparison Probing- 2-6 minutes • Set up flail – 15 seconds • Walk away – 90 seconds • Run flail – 10 seconds • Walk back – 90 seconds • Finish operation – 15 seconds • Total ~4 minutes
Charcoal Briquette Making Time and Motion Study Total = ~4 hours
Break process into steps • Load charcoal • Hammer • Eject Briquette
Define the steps • Load charcoal – until hand releases scoop • Hammer – until hand releases hammer • Eject Briquette –until hand releases pin
What took so long? • Hammering • Pick up hammer • Pick up piston • Insert piston • Hammer • Remove piston • Set down piston • Set down hammer
New designs • No corners in compaction area (no cleaning necessary) • Piston hangs in top of tube (don’t remove and set down piston) • One handed eject door (don’t set down hammer) • Use hammer to open eject door (eliminate the closing pin) • Estimated speed = 5 Briquettes per Minute (BPM) • (old machine 2 BPM) • Alternate design: Two pistons • Estimated speed = 5.4 to 6.6 BPM, depending on the loading method. • Conclusion: second piston is not worth the added complexity
Types of time studies: • External: Compare your product to other products to see what the benefits are (or are not). • Internal: See if your product is efficient, and identify the best places for improvements.