Mixed data collection (SPC) for different mold cavities

#1
Hi,
My company is producing rubber parts for automotive customers. We have a new prodcut with a very-high-number-cavity tool. Cavities are not identified. We have to perform SPC for a certain product parameter, but it is impossible to do it per cavity.
Till now we work with max. 4 cavity tools, so the separated data collection per cavity was not an issue. Does it make sense to make SPC without cavity-differentiation?
 
Elsmar Forum Sponsor

Bev D

Heretical Statistician
Staff member
Super Moderator
#2
Re: Mixed data collection (SPC) for diff. cavities

you'll never know until you try...
it might be possible if there is very little difference between cavities.

the complication here is that the within subgroup variation is controlled by the fixed cavity to cavity differences and the sugbroup to subgroup variation is controlled by the shot to shot factors.

so you might also try two separate charts. the first is an IMR chart for the subgroup averages and then a R or S chart for the within subgroup variation...
 
Thread starter Similar threads Forum Replies Date
GURU SDI Rust preventive oil mixed with kerosene Problem Solving, Root Cause Fault and Failure Analysis 2
H Taguchi mixed model DoE [L16 (4^3 2^6): factors interaction and ANOVA calculation Using Minitab Software 3
M Mixed Reality - What kind of possibilities can you imagine? Coffee Break and Water Cooler Discussions 1
G How to create a mixed OAs in Minitab Using Minitab Software 1
D What is your experience with FDA using "mixed load" i EO sterilization Other Medical Device Related Standards 1
C Flow Meter calibration for mixed gases Calibration and Metrology Software and Hardware 1
M AQL (Acceptable Quality Level) for Mixed Part Defect IATF 16949 - Automotive Quality Systems Standard 1
D Mixed Level Pull Simulation - Stock Evolution and Machine Load Lean in Manufacturing and Service Industries 3
S Batch Traceability for Bulk Materials which are mixed in the Storage Tank IATF 16949 - Automotive Quality Systems Standard 6
M Mixed Use of Corporate and Site Level Procedures and Forms in the Quality System ISO 13485:2016 - Medical Device Quality Management Systems 1
D Mixed Automotive and Non-Automotive Quality Systems IATF 16949 - Automotive Quality Systems Standard 22
J Any MMA (Mixed Martial Arts) fans here? Coffee Break and Water Cooler Discussions 33
K What to do when form numbers get mixed up on your documents.... Document Control Systems, Procedures, Forms and Templates 2
H Medical Devices and Mixed Lots Manufacturing and Related Processes 4
P Mixed Model Assembly Line Control Plans - Many different options that are available FMEA and Control Plans 2
D Mixed Product - Keeping one product from being mixed with similar product Misc. Quality Assurance and Business Systems Related Topics 12
DuncanGibbons Technical Data Package vs Digital Product Definition APQP and PPAP 0
Z Putting back excluded rows/data points in a control chart Using Minitab Software 0
F General Data Protection Regulation (GDRP) CE Marking (Conformité Européene) / CB Scheme 6
Z Minitab - Updating Graph with specific data points Using Minitab Software 2
E PEMS Hazards - IEC 60601 Clause 14.6 - Internal data use - Pressure sensor IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
K Transform variable data into attribute data Reliability Analysis - Predictions, Testing and Standards 24
R Clinical evaluation without clinical data - MDR Article 61(10) EU Medical Device Regulations 6
H Capability Data for Paint Thickness on Painted Parts Statistical Analysis Tools, Techniques and SPC 10
D BS EN 62304 - Medical-Relevant Data C.5 - Definition of IEC 62304 - Medical Device Software Life Cycle Processes 5
T Submitting MR Compatibility Data for 510(k) Cleared Device Other Medical Device and Orthopedic Related Topics 2
S Quality manager considering data science Quality Manager and Management Related Issues 19
A What are Practical data center best practices IEC 27001 - Information Security Management Systems (ISMS) 0
U Do we need clinical trial data for Class IIa medical device under MDR EU Medical Device Regulations 7
S Average and standard deviation of Cumulative Data Statistical Analysis Tools, Techniques and SPC 5
V IS/ISO/IEC 17025:2017 Clause 7, sub clause 7.11 Control of data and information management ISO 17025 related Discussions 1
Watchcat CERs Literature Databases - Searching for data to evaluate EU Medical Device Regulations 16
D Transformation of Data Normality Failed Using Minitab Software 11
J Sample size for creating a data base as a reference to a tested variable Other Medical Device and Orthopedic Related Topics 6
M GUDID data deficiency communication - IS THIS A SCAM? ISO 13485:2016 - Medical Device Quality Management Systems 29
H Question about implications of performing Firmware upgrade via MDDS - Medical Device Data Systems 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
R Demonstrate how sufficient levels of access to data is achieved - Claims of equivalence EU Medical Device Regulations 3
R Material safety data sheet (MSDS) related clause in IATF 16949 manual IATF 16949 - Automotive Quality Systems Standard 17
CPhelan Using clinical trial safety data for evidence for CE marking EU Medical Device Regulations 7
M Informational US FDA – MDR Data Files – Alternative Summary Report Data Since 1999 Available Medical Device and FDA Regulations and Standards News 0
CPhelan Do you require MDSAP for CE Marking of a Medical Device or is ISO13485:2016 with clinical data sufficient? CE Marking (Conformité Européene) / CB Scheme 5
M Data analysis Design of Experiments Using Minitab Software 3
S Seeking efficient method to manage install base data Manufacturing and Related Processes 0
V Every good documentation practice observation is an data integrity issue US Food and Drug Administration (FDA) 7
M Informational US – National Evaluation System for Health Technology Coordinating Center (NESTcc) Solicits Public Comments for Data Quality and Methods Frameworks Medical Device and FDA Regulations and Standards News 0
M Informational Eudamed Data Exchange Guidelines Medical Device and FDA Regulations and Standards News 0
M Informational EU – Eudamed Data exchange services and entity models introductions Medical Device and FDA Regulations and Standards News 4
M Informational EU – M2M Data Exchange available services for accessing MDR EUDAMED data available for Economic Operator (EO) organisations Medical Device and FDA Regulations and Standards News 0
V What is the criteria to cite an good documentation practices observation as an data integrity related issue US Food and Drug Administration (FDA) 6
D Do we need normal data for gage r&r studies? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 5

Similar threads

Top Bottom