lStep 5: Compile
elements of engineering specification into a single document
Prescriptive Specifications (Constraints)
Review of concept variants during concept selection
RBS
Force
to "cock" launcher ≤ 5 lb.
12-Feb
Measure triggering force of alpha prototype
KLW
Force
to press trigger < 0.5 lb.
13-Feb
Weigh
alpha prototype
CAR
Weight
< 2 lb.
12-Feb
Performance Specifications
Review of concept variants during concept selection
KAG
Excess
energy is dissipated by product
12-Feb
Measure available energy during proof of concept
REF
> 80% of stored energy is transferred to disc for launch
12-Feb
Measure energy storage potential during proof of concept
REF
Product
stores > 80% of user input energy
14-Feb
Verify with engr. drawings during preliminary design phase
KLW
Average
diameter of grasping surface < 1 in.
13-Feb
Review of concept variants (estimated size of grasping surface) during concept selection
RBS
Grasping surface can be held by the 95 percentile 4 year old
12-Feb
Test/Verification
Resp.
Specification
Date
Example: Specifications
Sheet for Disc Launcher Toy (Partial)
The Performance Specification Method