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 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

Briquette Making

Original prototype in use

Break process into steps 1.Load charcoal 2.Hammer 3.Eject Briquette

Define the steps 1.Load charcoal – until hand releases scoop 2.Hammer – until hand releases hammer 3.Eject Briquette –until hand releases pin

Time study data (seconds)

Time trial data

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

New machine 2.5x faster

New machine time breakdown

More people 5.5x faster

Comparison between machines

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. Types of time studies: