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IENG 486 - Lecture 19. Introduction to Mil Std 105E. Assignment. Reading: Chapter 15 Sections 15.1 – 15.2.4 : pp. 632 - 646 Sections 15.4 – 15.4.3 : pp. 655 – 663 Homework: Download and complete Last Assign: Acceptance Sampling Requires MS Word for Nomograph

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ieng 486 lecture 19

IENG 486 - Lecture 19

Introduction to Mil Std 105E

IENG 486 Statistical Quality & Process Control

assignment
Assignment
  • Reading:
    • Chapter 15
      • Sections 15.1 – 15.2.4: pp. 632 - 646
      • Sections 15.4 – 15.4.3: pp. 655 – 663
  • Homework:
    • Download and complete Last Assign: Acceptance Sampling
      • Requires MS Word for Nomograph
      • Requires MS Excel for AOQ pp.

IENG 486 Statistical Quality & Process Control

military standard 105e mil std 105e ansi asqc z1 4 iso 2859
Military Standard 105E(MIL STD 105E)(ANSI/ASQC Z1.4, ISO 2859)
  • Most widely used acceptance sampling system for attributes
  • MIL STD 105E is Acceptance Sampling System
    • collection of sampling schemes
  • Can be used with single, double or multiple sampling plans
    • We will consider single sampling plans for this course

IENG 486 Statistical Quality & Process Control

inspection types
Inspection Types
  • Normal Inspection
    • Used at start of inspection activity
  • Tightened Inspection
    • Instituted when vendor’s recent quality history has deteriorated
    • Acceptance requirements for lots are more stringent
  • Reduced Inspection
    • Instituted when vendor’s recent quality history has been exceptionally good
    • Sample size is usually smaller than under normal inspection

IENG 486 Statistical Quality & Process Control

switching rules
Switching Rules

IENG 486 Statistical Quality & Process Control

procedure for mil std 105e
Procedure for MIL STD 105E
  • STEP 1: Choose AQL
    • MIL STD 105E designed around Acceptable Quality Level, AQL
      • Recall that the Acceptable Quality Level, AQL, is producer's largest acceptable fraction defective in process
    • Typical AQL range:
      • 0.01%  AQL  10%
      • Specified by contract or authority responsible for sampling

IENG 486 Statistical Quality & Process Control

procedure for mil std 105e7
Procedure for MIL STD 105E
  • STEP 2: Choose inspection level
    • Level II
      • Designated as normal
    • Level I
      • Requires about one-half the amount of inspection as Level II
      • Use when less discrimination needed
    • Level III
      • Requires about twice as much inspection as Level II
      • Use when more discrimination needed
    • S-1, S-2, S-3, S-4
      • Four special inspection levels used if very small samples necessary

IENG 486 Statistical Quality & Process Control

procedure for mil std 105e8
Procedure for MIL STD 105E
  • STEP 3–Determine lot size, N
    • Lot size most likely dictated by vendor
  • STEP 4: Find sample size code letter
    • From Table 15-4, p 657
    • Given lot size, N, and Inspection Level, use table to determine sample size code letters
  • STEP 5: Determine appropriate type sampling plan
    • Decide if Single, Double or Multiple sampling plan is to be used

IENG 486 Statistical Quality & Process Control

procedure for mil std 105e9
Procedure for MIL STD 105E
  • STEP 6: Find Sample Size, n, and Acceptance Level, c
    • Given sample size letter code, use Master Tables: 15-5, 15-6, and 15-7 on pp.658-660
    • Find n and c for all three inspection types:
      • Normal Inspection
      • Tightened Inspection
      • Reduced Inspection

IENG 486 Statistical Quality & Process Control

example
Example
  • Suppose product comes from vendor in lots of size 2000 units. The acceptable quality level is 0.65%. Determine the MIL STD 105E acceptance-sampling system.

IENG 486 Statistical Quality & Process Control

slide11

Normal Insp. Level

Lot Size

= 2000

IENG 486 Statistical Quality & Process Control

slide12

AQL

Plan K

Sample 125 units.

Ac = 2, accept if defects ≤ 2.

Re = 3, reject entire lot if defects ≥ 3.

IENG 486 Statistical Quality & Process Control

slide13

AQL

Plan K

Sample 125 units

Ac = 1, accept if defects ≤ 1.

Re = 2, reject entire lot if defects ≥ 2.

IENG 486 Statistical Quality & Process Control

slide14

AQL

Plan K

Sample 50 units

Ac = 1, accept if defects ≤ 1.

Re = 3, reject entire lot if defects ≥ 3.

IENG 486 Statistical Quality & Process Control

questions issues
Questions & Issues

IENG 486 Statistical Quality & Process Control