Biomedical Engineering Reference
In-Depth Information
Proposed
design
Reduce cost of
assembly
Reduce cost of
components
Reduce cost of
manufacture
Consider effect of
changes
Good
enough
Figure 8.22
General DFM(A) process.
Table 8.7: 6
σ
Seven Wastes Applied to DFM
Waste
Description/Question
1. Waste of overproduction
l
Can you reduce off-cuts?
l
How many components can be made from one standard size
item (sheet, bar, etc.)?
l
How many do you need to make?
2. Waste of waiting
l
How long does it take to make?
l
Time to delivery?
l
Will you need to wait excessively for specialist materials/services?
3. Waste of transporting
l
Will it need multiple subcontractors to complete?
l
Are the subcontractors disparately placed?
4. Waste of inappropriate processing
l
No. of holes?
l
No. of variations?
l
Silly dimensions or tolerances?
l
Do you need new tooling or can you reuse existing tooling?
5. Waste of unnecessary inventory
l
Too many components?
l
Too many variations in stock items?
l
Too many variations of similar components?
l
Do you need new jigs and fixtures or can existing ones be reused?
6. Waste of unnecessary motion
l
“Fiddly” surface profile?
l
No real point of holding during manufacture?
l
Have you specified a datum?
7. Waste of defects
l
Too complex?
l
Designed in manufacturing issues?
l
Ill-conceived tolerances?
“New” Waste
7(b) Waste of untapped human potential
Have you spoken to the people who will make it?
l
Have you sought advice from those who may understand the
manufacturing process?
l
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