Page 402 - Design for Six Sigma a Roadmap for Product Development

Design for X 371

6. Minimize all service problematic areas by reviewing the customer
concern tracking system (if any), determining and eliminating root
causes, addressing the problem based on a prioritization scheme
(e.g., Pareto analysis of warranty cost impact), searching for solu-
tions in the literature and core books, and predicting future trends.
7. Determine solution approached in design from steps 1 to 6. The
information extracted from the gathered data will lead to some
formulation of a serviceability design strategy. Every separate
component or critical part should be addressed for its unique ser-
viceability requirements.
8. Introduce serviceability design parameters (DPs or solution) into
the process structure. These can be categorized according to
answers to the following questions:
a. Orientation:
(1) Do the parts have easy removal paths (sum of service steps)?
(2) Do the service steps require re-orientation?
b. Contamination:
(1) Can the fluid, if any, be contained prior to or though service?
(2) What is the possibility of contaminating parts during service?
c. Access
(1) Assemblability. Is it possible to group components for ease of
service? Check the structure.
(a) Is disassembly intuitive?
(b) Can asymmetric components fit one way?
(2) Reachability. Can the part be reached by hand? By tool? Can
the part be removed from the assembly?
(3) Layerability. Is the part in the assembly layer correlated to
frequency of service?
(4) Real estate. Possibility of moving or sizing parts for service
space.
(5) Efficiency. Unnecessary removal of parts which obstruct vis-
ibility or service.
(6) Diagnostics. Can the part be accessed for diagnostics without
disassembly?
(7) Service reliability. Address potential damage of serviced or
removed parts. Have all possibilities for parts minimization
using DFMA been exhausted? Consider the use of standard
parts (e.g., fasteners).
d. Simplicity—Customer considerations:
(1) Tools. Design for generic tools. Minimize use of specialized
tools.
(2) Adjustment. Reduce customer intervention through tuning
and adjustment. Use robustness techniques.
(3) Poka-yoke. Use color codes and very clear instructions.