Error - Chapter 11:The design and analysis of tolerances...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 11:The design and analysis of tolerances Lectures 11& 12 Feb, 25 th , 2008 IQC
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Outline Tolerances and competitiveness Loss-function and tolerances Statistical assessment of tolerances Midterm 1
Background image of page 2
Introduction Six-sigma vs. tolerance specification Process capability: given tolerance specification Loss function and tolerances
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Tolerancing and competitiveness Concerned with physical and chemical properties Deviations from design nominal are inevitable Design engineers determines a maximum allowable deviation known as the tolerance Deviations from the nominal cause additional losses Management: Try to make parts within the specification limits
Background image of page 4
Tolerances in practice Every effort should be made to set the tolerances as large as possible
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
X X LS US k X L E σ 8 ) ( )] ( [ 2 = - = 12 / ) ( 2 LS US X - = Uniformly distributed (LS,US) 12 / ) ( )] ( [ 64 / ) ( )] ( [ 2 2 LS US X L E LS US X L E - = - = Cost of f_1 Cost of f_2
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Designing Tolerances Assumption: The nominal and tolerance interval designed optimally Practice: Nominal through careful engineering, tolerance arbitrarily after nominal is set When specifications cannot be met increase tolerances Nominal and tolerances should be designed simultaneously
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Parameter interaction Tolerance should be designed together with each of the nominal values and with all related quality features jointly Surface response technique
Background image of page 10
Six-sigma Quality Process Mean = nominal value M M should be 6 sigma from LS and US Process mean is allowed to vary from M by a maximum 1.5 sigma Problems Process control very difficult not meaningful pk C
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 54

Error - Chapter 11:The design and analysis of tolerances...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online