Presentation on MSA by TS16949 Auditors From UL India(1)
Transcript of 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
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Measurement System
Manufacturing
Process Input Material
Process
design
Product
Design
(Tolerancing)
Machine Tooling
Parameter
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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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
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Process Capability
Lower Spec. Limit Upper Spec. Limit
6
Tolerance = T
Process Capability = T / 6 > 1.33
Means, 6 < (0.75*T)
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Impact of Uncertainty
Lower Spec. Limit Upper Spec. Limit
6 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 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
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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 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
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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 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.
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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 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