Design for Manufacture Flashcards

1
Q

For a symmetrical distribution what is the tolerance range

A

2tolerance (=2ztheta)

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2
Q

What range should the value for z fall in

A

4 - 7.5 theta (1 in 63ppm to 0 ppm)

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3
Q

How does asymmetrical distribution occur

A

tool wear can give consistent bias

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4
Q

What is a house of quality

A

it helps to convert customer requirements into engineering requirements

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5
Q

What is a product footprint

A

Product footprint defines the brand

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6
Q

What is the difference between ‘first-to-market’ and ‘fast follower’

A

first-to-marker seek the ‘first mover advantage’ through premium prices. Other companies may prefer to be ‘fast followers’ to learn from the mistakes of the first-to-market

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7
Q

What kind of order can products be made for

A
Engineering to order (ETO)
Make to order (MTO)
Assemble to order (ATO)
Make to stock (MTS)
Ship to stock (STS)
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8
Q

What is mass customization

A

Its a marketing technique that combines the flexibility and personalization of custom-made products with the low unit costs associated with mass production

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9
Q

What is product architecture

A

The scheme by which the function of the product is allocated to physical components and the specification of interactions between physical components

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10
Q

What are the advantages of modular units

A

Ease of maintenance, quality control over assembly, sealed for life

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11
Q

What are the disadvantages of modular units

A

Small defects cant be easily repaired, requires high volumes to make feasible

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12
Q

What are the advantages of platform design

A
Easier inventory management/smaller number of parts
Lower development costs
Increased quality
Global standardization
Greater product variety
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13
Q

What is the best way to achieve low mass and volume

A

have integrated products with minimal interfaces

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14
Q

What is the best way to minimise complexity

A

best to have a modular design with sub-assemblies and standard interfaces

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15
Q

What is the purpose of quality management

A

it ensures adequate paper trails for design reviews, materials sourcing, component sourcing, product testing and company decision making

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16
Q

Name 2 quality standards

A

BS7000 Design Management Systems

ISO 9000 Quality Assurance

17
Q

What is the 6 sigma rule

A

If manufactured parts have a normal distribution such that six sigma falls within the tolerance limits then there will be very few failures

18
Q

What is lean manufacturing

A

Lean manufacturing is a method for minimizing waste within a manufacturing system without sacrificing productivity

19
Q

What is a poka yoke

A

any mechanism in a lean manufacturing process that

helps an equipment operator avoid mistakes

20
Q

For an asymmetrical distribution around the mean, what is the equation for the worst case scenario

A

z_2 = | x_m - L_2 | / sigma

21
Q

What are Cp and Cpk

A

Process capability numbers (for symmetrical and asymmetrical respectively)

22
Q

What is Cp equal to

23
Q

What is Cpk equal to

A

x_m – L_n | / (3*sigma)

24
Q

What does a house of quality table look like?

A
Customer requirements (column list); customer priority (1-5); Engineering requirements (row list)
Correlation denoted by 1, 3 or 9
25
What is house of quality used for
Converting customer requirements into engineering requirements
26
What does Total quality management (TQM) embody?
TQM emphasizes right first time, continuous quality improvement and prevention over inspection
27
What must be considered when defining product architecture?
What is the sales volume? What is the desired performance? Should the product be adaptable or upgradeable (modular)