Presentation on MSA by TS16949 Auditors From UL India(1)

7/16/2019 Presentation on MSA by TS16949 Auditors From UL India(1)

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Measurement System Analysis (MSA)

Discussions at CSIR

S.A.

28-07-2005



Measurement System

Manufacturing

Process Input Material

Process

design

Product

Design

(Tolerancing)

Machine Tooling

Parameter

variation

Method

variation

Processing

material

Environment

Sources of Variations

Measurement



Fundamental Properties of a GOOD

measurement system• ADEQUATE SENSITIVITY – 10 TO 1 RULE –

Instrument ACCURACY (and therefore Least Count)should divide the tolerance ( or process variation) into 10

parts or more –

practical minimum point for gaugeselection

• Measurement system ought to be in statistical control – presence of only common causes of variation and not thespecial causes

• Variation of measurement system must be small comparedto specification limits or process variation (6-sigma) – more PRECISION



Inaccurate and imprecise

+



Accurate and imprecise

+



Precise but inaccurate

+



Accurate and precise

+



NATIONAL

STANDARD

LABORATORY

STANDARD

WORK

STANDARD

GAUGE FOR

INSPECTION /

TESTING

RU =

0.0001

RU =

0.001

RU = 0.01

RU = 0.05

U : UNCERTAINITY

RANDOM UNCERTAINITY –

FOUND THRUCALIBRATION

SYSTEM UNCERTAINITY – OF

MASTER

TOTAL UNCERTAINITY –

SQRT( RU*RU + SU*SU)

U =

0.0001

U =

0.001005

U =

0.01005

U =

0.05099



Process Capability

Lower Spec. Limit Upper Spec. Limit

6

Tolerance = T

Process Capability = T / 6 > 1.33

Means, 6 < (0.75*T)



Impact of Uncertainty

Lower Spec. Limit Upper Spec. Limit

6 Process

Tolerance = T

ERROR identified through

Calibration Process

Uncertainty



Questions

• Can an ISO/TS 16949: 2002 certification program ensure systemsand processes which deliver products which conform to atechnical specification?

• Yes, TS SCOPE, point # 1.1, states…

• This international standard specifies requirements for a qualitymanagement system to demonstrate ability to CONSISTENTLYprovide PRODUCT that meets product, customer and regulatoryrequirements

• Requirements specified in standard are complementary to productrequirements

• Emphasis on PROCESS DESIGN to deliver conformance toproduct specifications CONSISTENTLY …. Focus on REDUCTIONIN VARIATION by asking ongoing capability evaluation…including

measurement systems’ variation, which an process engineer mustevaluate during development

• Product and process approval is a requirement throughoutSUPPLY CHAIN, which includes elements such as FMEAs, ControlPlans, SPC & MSA



Questions

• Are customer specific MSA requirements addressed in ISO/TS

16949: 2002 audits?

• Yes, the scope of certification includes ISO/TS-16949 +

CUSTOMER SPECIFIC REQUIREMENTS

• ISO/TS 16949:2002,

• POINT # 0.5 : Goals of this Technical Specification, Para #2

• This Technical Specification, coupled with applicable customer

specific requirements, defines the fundamental qualitymanagement system requirements for those subscribing to this

documents.

• Most of the subscribing customers (OEMs asking vendors to get

registered to TS 16949) ask usage of AIAG MSA MANUAL



Questions

• To what degree are customer specific MSA requirements

addressed in ISO/TS 16949: 2002 audits?

• Audits wrt TS-16949 are planned considering business processes

identified by organization to meet the product and customers

needs and expectations, calibration and MSA is one of such

processes

• ISO/TS-16949:2002 (Point # 7.6.1: Measurement System Analysis)

• Statistical Studies SHALL BE conducted to analyze the variation

present in the results of EACH TYPE of measuring and test

equipment system.

• The requirement shall apply to measurement systems

REFERENCED IN THE CONTROL PLAN

• The analysis methods and acceptance criteria used SHALL

confirm to those in CUSTOMER REFERENCE MANUALS on

measurement systems analysis



Questions

• Would ISO/TS 16949:2002 auditors benefit from additional training

in Measurement System Analysis?

• Certainly Yes. Rather it’s a REQUIREMENT. Otherwise how could

they assess suitability and impact of MESUREMENT SYSTEM

ERRORs on products’ quality?

• Auditor Qualification requires….

• 6 years prior experience in AUTOMOTIVE, out of which 4 years in

Quality• Qualification Course contents and examination includes CORE

TOOLS – APQP, PPAP, FMEA, SPC, MSA, etc

• Ford & GM specific requirements demand even the internal

auditors shall be trained and evaluated wrt knowledge on core

tools including MSA.



• Who conducts the MSA? (supplier/OEM?)

• The user of measurement system shall conduct the MSA

• Are FOP, (first of production), tests conducted?

• Review is Must, if necessary do it!

• Who is responsible for conducting these tests, OEMs or suppliers?

•Of course the manufacturer (supplier)

• Who is responsible for evaluating that the measurement system is capable of

performing the required measurements with the desired level of accuracy?

•Of course the manufacturer (supplier)

• Do these tests form part of the control plan?

• Yes, they have to be!

• Is the understanding that an MSA addresses the measurement accuracy of a

measurement system or merely its repeatability/reproducibility?

•It addresses both – location (accuracy) and variation (precision)



Application of appropriate method

TYPE OF

GAUGE

BIAS /

UNCER-TANITY

LINEARITY STABILITY GRR

VERNIER

0-150mm SKILL IN

HOLDING THE

JAWS PARALLALYCMM

0-1500mm SLIP GAUGES

SKILL OFRINGING

PLUG GAUGE

FOR BORE OF

20.025/20.00

0

SKILL ON

BORDERLINE

CASES

Presentation on MSA by TS16949 Auditors From UL India(1)

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