Manufacturing Systems

Question 1

Lower control limit and upper control limit formula

Answer 1

LCL: mean - 3 standard deviations
UCL: mean + 3 standard deviations

Question 2

Control graph- if drifting towards UCL/LCL

Answer 2

There might be a problem that needs to be investigated.

Question 3

Standard deviation

Answer 3

Is the measure of how much variation there is in a set of values. It is used to measure and control how much a manufactured product is allowed differ from its ideal value.

Question 4

What does it mean when process capability is

i) < 1
ii) = 1
iii) > 1

Answer 4

i) defects are being made 🙁
ii) The process is just meeting specifications 😐
iii) very few defects being made. 😆

Question 5

Calculating process capability.

Answer 5

                      6(standard deviation)

Question 6

Accelerated life testing

Answer 6

Simulates the real lifespan of a product by continuously and intensely testing it for shorter periods of time until it fails.

Question 7

Qualitative accelerated life testing

Answer 7

Tests which parts of the product will fail when subjected to long periods of use. Subjected to different extreme conditions until it breaks. Eg. High temperature, loads, repeated movement.

Question 8

Quantitative accelerated testing

Answer 8

Measures the amount of time it takes for the product (or part of the product) to fail when used continuously without stopping. The manufacturers can offer warranties based on the testing.

Question 9

Ergonomics

Answer 9

The study of people and their relationship with the environment around them.

Question 10

Anthropometrics

Answer 10

The study of the human body and it’s movements

Question 11

Reverse engineering

Answer 11

Taking something apart to see how it works, in order to learn from, duplicate or enhance the object.

Question 12

Perceptual mapping

Answer 12

A technique that attempts to display customers perception of a product/ company. It analyses and ranks the customers opinions about a product and plots the results on a graph. The graph has 2 axis. In the shape of +

Question 13

Design for the environment
Manufacturing
Packaging
Disposal

Answer 13

Aim of the approach is to protect the environment by conserving resources and by reducing pollution.
Manufacturing stage: materials should be recyclable, non-toxic, locally sourced, minimum packaging.
Packaging: reusable, recyclable and minimal.
Disposal: recycled, long life span, serviceable,