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