Trying to set up a serious PPM system - Parts per Million

P

PaulSteed

#1
We are trying to set up a serious PPM system to control the quality of our suppliers. there seem to be various definitions of 'the number of opportunities for error'. Does anyone know of a standard definition that all our suppliers can recognise. eg a hole can be wrong place, wrong diameter, wrong depth, wrong finish, out of circular, out of perpendicular, wrong bottom profile etc etc. This mus be laid down somewhere??

Help please.

Thanks

Paul Steed
qualityclinics.com
 
Elsmar Forum Sponsor
C

CJacobsen

#2
Looking into the outlines for training I have given in the past, I have given the following for a definition of Parts Per Million or PPM:
One nonconforming (or defective) item in a collection of 1 million items is called one part per million. A nonconforming or defective item is classified this way after the first anomoly that causes the item to be out of acceptable limits/tolerances.

So based on your question, if a part has 7 defects, any one of them alone causes the part to be defective - all seven would tell you that there is not one root cause but probably many you would need to go after in order to reduce the rate. There is no absolute scale by which a component/parts
quality can be evaluated. The quality levels required depend on the complexity of the systems built from the components/parts. Although your part has seven identifiable defects, the first one found caused it to be
classified as defective or nonconforming. The rest of the defects found, although indicative of a larger problem in any given process, do not count when you are calculating ppm since you are looking at more than one part produced and the production rate of conforming parts. If you are looking
for defect rate regardless of number of parts or number of defects found on a single part, this would change. Now the 1 million parts would be counted by adding up all the possible defects for a single part then dividing 1 million by that number to determine how many parts it would take if all
defects were found in every part to reach a million. That number of parts would constitue the total number needed and each would be inspected for each defect. Now you are looking at ppm but for defect found and not part produced.

As far as documenting these values - the number of defects allowed for 1 million parts produced or the total number of defects found in a sample group that would represent 1 million defects if all are found - yes. How
would people know what the goals are or if they are achieving those goals if
they are not published/documented somewhere. This would be part of a continuous improvement program.

Hope this helps you out.
 
Thread starter Similar threads Forum Replies Date
Skooma Receiving Inspection - Boss trying to save money AS9100, IAQG 9100, Nadcap and related Aerospace Standards and Requirements 7
M Error trying to Start a New Thread Elsmar Cove Forum Suggestions, Complaints, Problems and Bug Reports 2
N Student trying to apply Lean Six Sigma on a Construction project in my thesis Lean in Manufacturing and Service Industries 3
S Beginner trying to OEM a medical device - Branded Electric Acupuncture Pen EU Medical Device Regulations 3
K Trying to figure out what satisfies a few aspects of IEC 62304 IEC 62304 - Medical Device Software Life Cycle Processes 2
I Trying to explain some of the Management Review Inputs (AS9100D) Management Review Meetings and related Processes 10
S Trying to understand 7.2.1(d) of ISO 13485 - Medical Device User Training ISO 13485:2016 - Medical Device Quality Management Systems 8
M Help trying to explain accuracy procedure General Measurement Device and Calibration Topics 1
A Supplier trying to avoid RMA's Supplier Quality Assurance and other Supplier Issues 11
K Auditors are trying to drive this business General Auditing Discussions 36
P Value Stream Mapping - Trying to do Value Stream Mapping of our Products Lean in Manufacturing and Service Industries 3
M Trying to take current documentation and put it into ISO forms Document Control Systems, Procedures, Forms and Templates 1
J Trying to determine whether a steel plate is bowed with a Faro Arm Calibration and Metrology Software and Hardware 8
B I'm trying to write detailed Customer Service Work Instructions Customer Complaints 10
Mikishots Trying to locate a LEGIBLE MIL-STD-105E copy Inspection, Prints (Drawings), Testing, Sampling and Related Topics 5
A Trying to fit a GLM - Minitab 16 negative Error df Using Minitab Software 4
2 Trying to Implement a Manufacturing Engineer Concept to my Company Manufacturing and Related Processes 5
P Trying to figure Minor ? on Female Rolled Threads Various Other Specifications, Standards, and related Requirements 1
E Our Lean Initiative Manager is trying to eliminate Final Inspection Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
Jen Kirley Trying to back up a dead hard drive - how to do it? Coffee Break and Water Cooler Discussions 17
D Medical Device Packaging - Trying to learn Technical files EU Medical Device Regulations 4
Jim Wynne The Buell Blast: Trying to Make Chicken Salad out of Chicken Poop Coffee Break and Water Cooler Discussions 1
A A Quandary - Trying to do everything on a shoestring - Out The Door Numbers Career and Occupation Discussions 11
J Measuring Technique - Trying to measure on-time delivery turnaround Quality Tools, Improvement and Analysis 13
W Controlled Documents - Trying to differentiate document control levels Document Control Systems, Procedures, Forms and Templates 5
R Trying to decipher drawing - Hole Size Manufacturing and Related Processes 12
A CFO trying to turn Quality procedure for Purchasing into a purchasing manual ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 15
N Cost of Rejected Components - Trying to pokayoke a process Quality Tools, Improvement and Analysis 1
O ANOVA Analysis - Trying to understand MSA analysis- Please review my spreadsheet Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 22
R Trying to develop ISO 9001 training for a newly certified company ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
S Trying to find the actual ISO 17025:2005 standard requirements ISO 17025 related Discussions 6
H What I am trying to find is someone that remembers Memphis in the nineties Coffee Break and Water Cooler Discussions 10
V Minitab Pareto - Trying to plot a relation of Count and Cycle Time Using Minitab Software 5
L Kanban cards - Trying to initiate a true Pull System - Fastener Products Lean in Manufacturing and Service Industries 3
ScottK The Berry Amendment (Imposed by 10 U.S.C. 2533a) for DoD parts - Trying to decipher Various Other Specifications, Standards, and related Requirements 7
J Food Allergen Awareness Training - Trying to implement cGMP Training - Internal, External, Online and Distance Learning 1
T Internal QMS/ISO 'Contest' - I am trying to come up with a new awareness contest ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
B Attribute MSA calculation - Trying to find a form or software Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
J Analysis of Service life, Design life and Storage - Trying to find an example report Various Other Specifications, Standards, and related Requirements 2
Marc American alligator vs. Burmese python - Python Bursts After Trying to Eat Gator Coffee Break and Water Cooler Discussions 7
P Trying to automate analyses of data from production process using Quality Analyst Quality Assurance and Compliance Software Tools and Solutions 1
C CE mark - Trying to determine if our product needs CE approval CE Marking (Conformité Européene) / CB Scheme 8
S Novice quality manager trying to get AS9100 certification AS9100, IAQG 9100, Nadcap and related Aerospace Standards and Requirements 32
G Trying to find CAS numbers - The Database of chemical substance information IATF 16949 - Automotive Quality Systems Standard 3
C API Q1 Quality Manual Example - Trying to convert an existing ISO 9001 QMS Oil and Gas Industry Standards and Regulations 30
G I am Lost - Trying to implement an ISO 9001:2000 QMS ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 20
M BMW and MG Rover Customer Requirements - Trying to make a matrix Customer and Company Specific Requirements 6
R Trying to find an ISO 17025 accredited testing laboratory to verify our test results ISO 17025 related Discussions 14
Joe Cruse Electronic Signatures - We're trying 1" x 5" Digital Sign-on Pads Like UPS's Document Control Systems, Procedures, Forms and Templates 14
Gman2 Automotive PPM Requirements - Our customer is trying to demand a 100% 0 defect rate IATF 16949 - Automotive Quality Systems Standard 3
Similar threads


















































Top Bottom