Presentation on MSA by TS16949 Auditors From UL India

8/8/2019 Presentation on MSA by TS16949 Auditors From UL India

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Measurement System Analysis (MSA)

Discussions at CSIRS.A.

28-07-2005


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Measurement System

Manufacturing

Process Input MaterialProcess

design

Product

Design(Tolerancing)

Machine ToolingParameter

variation

Method

variation

Processing

material Environment

Sources of Variations

Measurement


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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


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Inaccurate and imprecise

+


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Accurate and imprecise

+


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Precise but inaccurate

+


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Accurate and precise

+


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NATIONALSTANDARD

LABORATORY

STANDARD

WORK

STANDARD

GAUGE FOR

INSPECTION /

TESTING

RU =

0.0001

RU =

0.001

RU = 0.01

RU = 0.05

U : UNCERTAINITY

RANDOMUNCERTAINITY

FOUND THRU

CALIBRATION

SYSTEMUNCERTAINITY OF

MASTER

TOTALUNCERTAINITYSQRT(RU*RU + SU*SU)

U =

0.0001

U =

0.001005

U =

0.01005

U =

0.05099


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Process Capability

Lower Spec. Limit Upper Spec. Limit

6 W

Tolerance = T

Process Capability = T / 6 W > 1.33

Means, 6 W < (0.75*T)


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Impact of Uncertainty

Lower Spec. Limit Upper Spec. Limit

6 W Process

Tolerance = T

ERROR identified through

Calibration Process

Uncertainty


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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 regulatory

requirements Requirements specified in standard are complementary to product

requirements

Emphasis on PROCESS DESIGN to deliver conformance toproduct specifications CONSISTENTLY . Focus on REDUCTIONIN VARIATION by asking ongoing capability evaluationincluding

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


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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 customerspecific requirements, defines the fundamental quality

management 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


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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


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Questions

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

in Measurement System Analysis?

Certainly Yes. Rather its a REQUIREMENT. Otherwise how couldthey 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.


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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)


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Application of appropriate method

TYPE OFGAUGE

BIAS /UNCER-

TANITY

LINEARITY STABILITY GRR

VERNIER

0-150mm SKILLIN

HOLDING THE

JAWS PARALLALY

CMM

0-1500mm

SLIP GAUGES

SKILLOFRINGING

PLUG GAUGE

FOR BORE OF

20.025/20.00

0

SKILLON

BORDERLINE

CASES

Presentation on MSA by TS16949 Auditors From UL India

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