Unit 4

Question 1

What are the four major costs of quality?

Answer 1

• prevention costs
• appraisal costs (qc)
• internal failures (defective parts)
• external costs (customer returns)

Question 2

What are the taxonomy (principals) of inspection?

Answer 2

total or partial
-100% of the products based on a sample study
statistical or not statistical
-based on statistical methods or not
quantitative or qualitative
-number of elements or appearance of the product
based on measures or based on functional traits
-numerical values or without measures
sensory or physical
-through human senses or by means of devices
subjective or objective
-evaluated by a person based on appearance or evaluated base on a specific measurable feature
internal or external
-within the process or as independent activity

Question 3

What are the shortcomings of inspections?

Answer 3

• they take time and are costly
• not 100% reliable
• inspection detects the problem but does not solve the problem

Question 4

What is Singo’s approach to inspection based SQC?

Answer 4

it evaluates a product sample, based on the number of defects found it accepts or rejects the lot
Then informs, using feedback analysis to find the problem or cause of the defect.

Question 5

What are the two main problems with SQC?

Answer 5

1. methods do not guarantee the quality of all products

2. feedback and corrective actions are slow and may not even be followed through on

Question 6

What are two methods to avoid problems with SQC?

Answer 6

inspection with poka-yoke device

self-checking work, for accelerated feedback

Question 7

What are the two principals of SQC inspections?

Answer 7

1. evaluate (using statistical samples)

2. inform (feedback analysis and find cause of the problem)

Question 8

What is Poka- Yoke?

Answer 8

is any mechanism in a process that helps an equipment operator avoid mistakes & defects by preventing, correcting, or drawing attention to human errors as they occur.
“mistake-proving”

Question 9

What is a self-check system? pros and cons?

Answer 9

• the worker who makes the part inspects the part

- most efficient method, may mot be objective (people dont like to point out their own mistakes)

Question 10

What is a source inspection?

Answer 10

• verify that all the inputs to a process are acceptable before the process is executed
  eg. process is good, machines are good, people are trained, software is good, raw mats are good