By Casey Dill, Andrew Torkelson and Arthur Connors

Customer NeedsCustomer Need # Importance Description Comments/Status

CN1 1 Wrist joint resembles human movement (two degrees of motion)  

CN2 1 Forearm resembles human motion (one degree of freedom)  

CN3 1 Elbow resembles human movement (one degree of motion)  

CN4 2 Designs are open and adaptable to future projects  

CN5 1 Controls are more intuitive  

CN6 2 Forearm is compatible with previous projects (i.e. the hand)  

CN7 3 Arm function is anatomically correct  

CN8 1 Full analysis of loadings and motion  

Importance: Sample scale (1=must have, 2=nice to have, 3=preference only)

Engineering SpecificationsEngr. Spec. # Importance Source Specification (description) Unit of Measure Marginal Value Ideal Value Comments/Status

ES1 2 CN6 Arm is capable of incorporating the hand N/A N/A TRUE Either hand will fit or not

ES2 3 CN5 Human interface can be understood quickly Minutes 20 5Measuring learning curve

for operation

ES3 1 CN1 Wrist motion replicating human motiondegrees of freedom 2 2  

ES4 1 CN2 Forearm motion resembles human motiondegrees of freedom 1 1  

ES5 1 CN3 Elbow motion resembles human motiondegrees of freedom 1 1  

ES6 1 CN7, CN8Provides enough power to counteract forces (e.g. lifting or grasping) lbf 20 60  

Source: Customer need #, regulatory standard (eg. EN 60601), and/or "implied" (must exist but doesn't have an associated customer need)

Description: quantitative, measureable, testable details

BenchmarkingMetric Number

Need Numbers Metric Importance Units

Shadow Robot Company

Merlin Robotics

01 Maximum Pull (6mm diameter, 150mm length) 1kg 7N/A

02 Maximum Pull (20mm diameter, 210mm length) 1kg 20N/A

03 Maximum Pull (30mm diameter, 290mm length) 1kg 70 10

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