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Ron

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  • #186804

    Ron
    Member

    I’ve just returned from a business trip to China and Korea… Business is definitely booming in those countries and appears to be improving in my business.
     

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    #186803

    Ron
    Member

    By definition Inspections will never be considered a value added activity. Now that I made a lot of friends let me go on…
    Value is in the eye of the customer..what they are willingto pay for. Since qualit of products and services is expected by the customer they may not be willing to pay extra for it.
    However, as we all know allowing defective product into our manufacturing systems can shut down a facility or a customer. So receiving inspection is a required “Waste” until such time as you have eliminated the need for it.  This comment may be applied for many non-value added functions.
     

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    #184608

    Ron
    Member

    You have touched on a very critical and important function…Team members. I am surprised that you would be perfomring a “Performance Assessment ” on team memberas by definition these people are those who are performing at least two job functions by participating on your team.
    Team members needs to be a part of the solution and as such you would evaluate their performance by their task completion, creastivity, dedication and influence in obtaining results.  Since the “team” delivers the project to completion any evaluation ofthe team would include the management of the team dynamics..
    Are you a good team leader? Did you select proper team members. Do the team members agree on their assigments and understand how to deliver their tasks on time ? Did you as a team leader address any issues and resolve conflict on your team?
    So my bottom line is the team is a result of  many activites the person responsible for the team member performance is you the team leader.

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    #184607

    Ron
    Member

    Shewhart SPCcharts are robust to the data type and do not require normal distribution data.
    I am not aware of any charts other than and ImR that you can use either type of data.
    There are application in using ratings as continuous data that can be interpreted using continuous methodology.

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    #184454

    Ron
    Member

    anything you can obtain data on can be plotted on a control chart. It is up to you what you do with the data and the output.
     

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    #184438

    Ron
    Member

    This of course is NOT CORRECT.
     
    when you samples sisze are small as they would be in statistical sampling plans using the formal equation for calculating process standard deviation are inaccurate therefore your software is inaccurate.
    you must use an approximation of process standard deviation which is what minitab does.
    Understanding the concepts behind the statistics is important. You can’t just write code and pretend to be an expert.
     

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    #184437

    Ron
    Member

    The short term answer is of cource Yes. But I question why you would even report COQ. COPQ (Cost of Poor Quality) is a significantly better metric to track.
    COPQ would contain : Scrap, Rework, Engineering evaluation time, warranty costs, etc.
    COQ contains many cost items that you really do not want to report because the metric drives the action .i.e. if you wantt o lower COQ fire the quality department.
     

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    #184428

    Ron
    Member

    The basic problem is the methodology you utilizedto calcualte everything. This is a large issue for those not truly understanding of the mathmatics behind the calculations.
    You did everything correct mathematically but not statistically.
    Process capability looks at the difference from the first reding to the second, from thesecondto third etc. That is why the order of manufacturer is important to maintain.
    Look at your standrard deviation and that calculated by minitab thge two are not the same.
    You used a software to calculate SD by a classical method then plugged it into a standard equation. This does not work in reality.
    When you select a subgroup size of 1 minitab calculate standard deviation using a moving range methodology, and adjacent observations are treated as subgroups.
    Within subgroup capability represents how the proces could perform if all variation were removed
    The Ppk would represent your data

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    #184391

    Ron
    Member

    This is a classic two sample T test.
     

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    #184257

    Ron
    Member

    Please let us know your product line I want to be sure I don’t buy any..
    A product recall is a function of the product failure mode criticality and also the likelyhood of occurrence.
    The decision to recall can never be a statistical “coin toss” for reputable companies.
    We base product recalls on the nature of the defect, the potential failure mode, and the likleyhood of occurrence. Obviously if it is a saftey issue the defect would always be recalled.

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    #184256

    Ron
    Member

    Yes,
    You refer to Cpk upper and Cpk lower in your case there is only a Cpk upper.
    The tool is being used to visually display where your data falls relative to the desired specification
     

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    #184255

    Ron
    Member

    Don’t know if you are a six sigma person but here is my thoughts:
    Use a simple Pareto methodology to group similar failure modes from your returns. Start with the largest failure mode and drill down in that group to determine root cause (s) and fix that issue then continue in this manner.
    Statistical sampling does not make any sense until you know more about the failure mode and mechanism.

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    #183997

    Ron
    Member

    There are many types of control charts and shewhart charts are only a few. These Shewhart charts do not require any specific distribution so sure go ahead and use them.
    EWMA may be your best choice since you can control the weighting on more recent data.
    Let us know how they work for your client.
     

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    #183876

    Ron
    Member

    Detection implies your ability to detect the defect you are inquiring about in your PFMEA. 1 – always detect it 10 never detect it.
    Do you have a method to detect the failure mode and mechanism you are describing before you deliver the product to the customer.

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    #183875

    Ron
    Member

    Damaris,
    First Pass Yield and RTY are totally different and should never be confused with each other.
    Your analogy is correct: RTY is the product of the yields at each step in a process. Each process steps should have a FPY. Never confuse FPY and RTY they are totally different.
    The reason this is so highly taught in Six Sigma training is that many times companies report FPY (i.e. the yield at final test) and report a very high FPY..Yet their costs are out of line.
    When you calculate RTY you bring out all of the fallout and issues in-process which are normally hidden in FPY calculations

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    #183750

    Ron
    Member

    Sure..remember that minitab loves the vertical columns  so enter your four heading above each column you will have to make 24 sets of these data one for each filler head.
    When you select the chart you are going to use to monitor the process you follow the simple minitab instructions and you have it.
    If you stack all your data vertically you can use the XBar&R chart to subgroup by filler head and you can compare one to another.

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    #183733

    Ron
    Member

    In six sigma the important metric is DPMO or defects per million opportunities.
    The posting of the printed circuit boards jogged my memory.. In the automotive world PPM was sufficient but in most industries including the automotive DPMO is more accurate as not all defects make an item defective.
     

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    #183657

    Ron
    Member

    This is sort of preaching to the choir but….. The first thing I noticed is that the author works at a university (this is not a recommendation for a person to comment about six sigma methodology). The second thing I notice is that his statement regarding people to people processes restates my first point..people working in education need to get out more…this gentlemen should actually go to work for a living and see who makes things in this country..surprise it is people speaking to people.
    I have several close frineds who consult in the medical world and have shared some great success stories with me about  things that have been accomplished in implmenting lean and six sigma methodologies in hospitals and laboratories.
    I have to be very concerned about “Industry Week” why they would publish an article like this. My guess is to stir controversy as we see in the postings here.

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    #183604

    Ron
    Member

    Linear regression investigates and models the linear relationship between a response (Y) and predictor(s) (X). Both the response and predictors are continuous variables.
    A Pearson correlation coefficient measures the extent to which two continuous variables are linearly related.
    One models the relationship the other quantifies the relationship.
     
     

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    #183603

    Ron
    Member

    Pete,
    You have an interesting problem statement; Tool usage as many have replied is subjective. However, You would not use either ofthese tools in the Define Phase or in the Control phasein most cases
    The problem with tools such as you have mentioned is that they do not carry and statistical validity. As such many people like to use them because it gives them the answer they wantedto hear.
    I like to think of the DMAIC steps associated with deliverables, i.e.
    D – Business Case for expending time and effort to solve a validated  problem statement
    M – A more focused problem statement based on the collection and analysis of data
    A- Root Cause (statistically verified) of the focused problem statement yourr team determined in the M phase
    I- An action plan to implement solutons to the root causes from the A phase. with verification that they solved the issue in the short term
    C- Financial results and a control plan to validate the solution in the long term
    Fish bones and 5 whys are brainstorming tools to help your team develop real solutions based on hard data that are statistically valid

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    #183560

    Ron
    Member

    PDCA is a concept that should never have developed as far as it has. Plan Do Check Act totally misses the fact that decision need to be data driven.
    I believe this is whuy the creators of the six sigma DMAIC methodology so rapidly over took this outdated terminology.
    Define – Define the problem you are working on.
    Measure – gather data on the current state problem
    Analyze – analyze the data to determine root cause
    Improve the process to remove the root cause
    Control – Monitor the process to assure you have made the correct changes
     
    when you compare the two it seems foolish to use the PDCA acronym doesn’t it?
    Plan what ? Do What Based on ??? Check what ? Act base on what?

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    #182678

    Ron
    Member

     
    To correct a flase statement…GE received six sigma from Larry Bossidy from Allied Signal.  Allied Signal did a great deal to convert the principles established from Motorola into a vibrant continuous improvement program.
    Jach Welch should receive credit for marketing the efforts of the sixsigma program in his comapny..which he took the principles established by his good friend Larry Bossidy.

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    #182521

    Ron
    Member

    You’re kidding right?
    Why not just go to a Office Max and have them print a certificate for you.

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    #182511

    Ron
    Member

    You did not share the nature of your data.. some attribute data can be stretched into continuous data if it is correctly setup.
    Did you have simply pass or fail or did you have degrees of goodness?

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    #182422

    Ron
    Member

    Kev,
    You’ve identified the key measures of a good supplier now you need to put those individual metrics into a method to “Rank” your supplier base.
    You then have a list of the good the bad and the ugly.. now is the time to use your six sigma tools to define a project to either improve or remove that offending supplier.
    If you follow the DMAIC process you first must define the problem statement, scope and goals of the project

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    #182362

    Ron
    Member

    As you stated you were wrong…Thanks for admitting your errors.
    I supposed next you are going to tell ne GM is  solvent company with a great future.

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    #182344

    Ron
    Member

    Wrong! If you believe that an 8D and the DMAIC process are the same you do not understand the DMAIC process.
    An 8D is a piece of paper the automotive industry created to define the corrective action taken as a result of some failure. While the words may imply a deep analysis the paper is a simple one page document.
    Following the DMAIC process you truly research, gather data, analyze daat to discover the true root cause of a problem implement a improvement plan and monitor the process…over time.
    Most 8D’s are expected to be completed in 24 to 48 hours…
    So bottom line what is written on an 8D form captures the essence of what the out put of a DMAIC process yields there is a world of difference in the methodology of how you come by these conclusions.

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    #182343

    Ron
    Member

    Go a couple of levels deeper in to the test stand.. You must program into the test stand the continuous variable that makethe little green or red light come on.
    Come on people use some analystic skills
     

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    #182341

    Ron
    Member

    Minitab is a software suite used to perfomr a variety of SPC, Quality and statistical functions,  Crystal Ball is used to perfomr Monte Carlo simulations. These are two very different things.
    Crystal Ball is  a powerful tool and I would suggest anyone in the six sigma field use it. But it had nothing to do with Minitab functions.

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    #182291

    Ron
    Member

    There should be no difference. You are using a test stand to verify certain elements of the PBCA. You will be performing an MSA on the inspection/Testing system.
    Breakdown this system into it finitie elementsand perfomr the analsysi as you would if you were measuring a machined surfce.
    Is there something you are not telling us that would make this any different?

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    #182288

    Ron
    Member

    Breyfogle books on implementing six sigma is a great reference tool.
     
     

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    #182283

    Ron
    Member

    Onur,
    A process or machine capability study should be performed upon initial purchase of a piece of equipment and after any significant maitenance operation perfomre oh that equipment prior to putting it back into production service.
    As a general rule I try to run a study each quarter and monitor the process with SPC chartage in the periods between running the studies.
    If you follow this refgimen you will be continuously running someform of “SPC” .

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    #182201

    Ron
    Member

    When I deliver lean training I always refer to job setup as planned downtime. This is where you obtain the metric to show improvement in setup reduction projects.
     

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    #182159

    Ron
    Member

    What is the nature of your distribution,,,normal  if normal you should use Bartletts Test

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    #182020

    Ron
    Member

    What do you want to accomplish? If you want to drive continuous improvement in a corporation hire a MBB with credentials from a well known Six Sigma Program.
    If you want to teach at a University and talk about six sigma go with the PhD.

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    #181788

    Ron
    Member

    That happens a lot here… they miss the point entirely

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    #181510

    Ron
    Member

    A paired T is only approriate when the two groups are identified before and after an action such as before training and after training.
    The comparison has to be made with the identical unit before and after the activity it receives.
    A two sample t is appropriate if this is not the case.

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    #181468

    Ron
    Member

    If you want to implement a lean system you should be only producing upstream when the downstream signal allows you to.
    It sounds as if you are attemtping to do what many rookies do..they performa “kaizen” in an area because someone complains about it and miopically focus on that one little area.
    Lean implementation is a site wide initiative and if you were properly using a kanban system what you descibed would never occur.
     

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    #181467

    Ron
    Member

    At Allied Signal we used a simple formula… three times the bill of material…  that was how we calculated DPMO.
    What you are actually looking for is the rate of improvement..so lock in on a methodology that works for you, standardize it across your company..don’t worry about what someone did 20 years ago and go forward.
     
     

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    #181302

    Ron
    Member

    As stated many times in many postings it is apparent that the U.S. auto industries never really adapted six sigma nor did many of their first tier suppliers.
     

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    #62281

    Ron
    Member

    thanks, we must be in the same Black Belt Class at Villanova

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    #62279

    Ron
    Member

    Tony,
    I am working on the same problem.  Was Robert’s answer correct?
    I came up with .4896 for the lower limit and 41.8974 for the upper limit.
     

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    #180780

    Ron
    Member

    Have you heard about two small companies…GE and Honeywell??  They use six sigma to drive their corporate strategy.
    Any organization that has rolled out Six Sigma properly would do likewise.. there  are of course many examples of poorly implemented six sigma implementations sounds like you are familiar with these.

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    #180575

    Ron
    Member

    OEE is made up of three parts – Efficiency of the equipment, Downtime of the Equipment and Quality of the product.
    All are good metrics… The difficulty with most companies the quality of the data is questionable and therefore the OEE calculation is questionable.
    As an overall rule combining the three into a single number quickly focuses attention to those pieces of equipment that deserve a closer look.
    Don’t fall into the trap some lean practitioners do in which they calculate OEE for a Cell which contains mutliple piecess of equipment as this is pure folly.

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    #180507

    Ron
    Member

    Sam,
    Give me your personal email address and I’ll send you a copy of ours.

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    #180506

    Ron
    Member

    Andrew,
    This forum should not be promoting any particular group..so I would look for a proven performer in the field.. i.e. those Lean Six Sigma personnel that received their training from a reputable training lineage.
    Allied Signal, or Early G.E. trained personnel I have found to be the best..many consulting group profess great credential but dont deliver the goods.
    It sounds llike you want someone to give your senior management an introduciton to six sigma..What better than either a customer or supplier that currently practices these principals..
    There are many out there that would be glad to do it for free. Don’t know your business but there probsbly is a Honeywell or GE facility in your area…ask them

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    #180505

    Ron
    Member

    Dan,
     
    0.010 is not considered a tightly toleranced measurement.  Typically as a rule of thumb your measuring equipment should be an order of magnitude tighter than the measurement you are seeking to measure, therefore use a gage that is accurate to 0.001 ths

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    #180466

    Ron
    Member

    Been there done that ..sounds like you have also Gary

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    #180465

    Ron
    Member

    Your question reflects the trend in industry to miss use terms.. This request is about a ignorant as someone asking what is the Sigma level of your company.
    PPM was the mainstay for the auto industry and as more folks hit the street from that industry we hear than more and more.
    PPM reflects the instant in time when you have tallied all of your defects against all of your shipments and there you go..what I assume is being asked is what actions are being taken to reduce the PPM year on year…the answer would be based on a bunch of things starting with a Pareto of current defects etc..
     

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    #180464

    Ron
    Member

    Your question reflects the trend in industry to miss use terms.. This request is about a ignorant as someone asking what is the Sigma level of your company.
    PPM was the mainstay for the auto industry and as more folks hit the street from that industry we hear than more and more.
    PPM reflects the instant in time when you have tallied all of your defects against all of your shipments and there you go..what I assume is being asked is what actions are being taken to reduce the PPM year on year…the answer would be based on a bunch of things starting with a Pareto of current defects etc..
     

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    #180463

    Ron
    Member

    Their are many very poor six sigma and LSS certification activites going on..
    If you did not work at GE it is possible that you went through BB as a supplier but I never heard of one obtaining an MBB.
    Keep in mind that GE is not the mecca of six sigma and in recent years has digressed to having folks take a test and that is it.
    In the later 90’s and early 2000’s they had a good program but that was about it.
     

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    #180462

    Ron
    Member

    Corect decision tree for attribute charts..is your area of opportunity constant ? Yes use a C chart, area of opportunity variable? Use a U Chart.
    When in doubt use an ImR for single point data.

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    #180461

    Ron
    Member

    Colette,
     
    Since you have sinlge point data I would use the equation for an ImR Chart and plot your data and calcualte your Upper and Lower control limit from your data.
    If you do it right you should obtain an UCL of 64.93 and LCL of 8.26
     

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    #180263

    Ron
    Member

    Uh No!

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    #180210

    Ron
    Member

    Remi,
    I do not know who taught you your GB methodology but your veerbiage seems to be confused.
    In the Define Phase you have defined your specific target area and problem statement.
    In the Measure phase you have completed your detailed process map, identified the Critical and controlable variables, you have also identifed the noise varialbes that may be affecting your process. Youi have gathered data which you have fitlered down to the 80 20 rule rule states that if you fix these 20 % of problems you will improve 80% of the process and have rewritten your problem statement to address this new focused view based on data.
    In  the Analyze phase you have statistically determined which variables have a direct impact on your problem statement.
    In the improve phase you are brainstorming solutions to you verified root cause issues. You are coming up with solutions that will fix the problem you have identifed. You will also create an action plan to implement these changes. Yo8u will redo an FMEA with the implemented changed in place to show the improvement. You will verify by running pilot projects that the improvments you put inplace have indeed reduced your defects. You will create training plans to pass this knowledge off to the process owners and you will calculate the financiall impact of your actions.
     
    Hope this helps

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    #180209

    Ron
    Member

    Vincent,
    Please do not be confused by people giving you the wrong answer to your questions.
    Process capability index is defined as (USL-LSL) / 6 sigma as such you can never obtain a negative number. The lower spec limit (LSL) will always be smaller than the upper Spec Limit
    Cpk (capability ratio) is not process capablity it is a numerical method of determining how centered your process is within your specification limits. A process can be capable of meeting the requirement but if it is not centered it will still produce bad parts. It is defined as the distance to your nearest specification limit divided by 3 sigma. This can be negative indicating the direction it is off center.
     

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    #59542

    Ron
    Member

    Can I also please get a copy of the card-drop game. My email address is ron.x.smith ‘at’ gmail.com. I have disguised the address to avoid bots stealing my address.
    Thanks

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    #180027

    Ron
    Member

    Thanks for your response

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    #180026

    Ron
    Member

    I disagree. classical Statistics has existed for hundreds of years.. Six Sigma methodology has taken these tools and put them in a methodology that has proven to be very effective. The DMAIC methodology is the break through and being properly trainied in how and when to use the corrct tool is the difeerence.
    I assume by your responsethat you have not participated in a six sigma training experience you thought was any good or you have never gone through the training
    This is what I have been asking about.

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    #179999

    Ron
    Member

    Not sure of your facility but setup and change over must be standardized once an improvement is locked in.
    Best way I’ve used is to video tape using time display on recorder to baseline current stat. Using the ICE ( Internal Converted to External) philosphy establish your improvements standardize and re-record the process with the improvement.
    Any more infor and you will need to tell us more about what you are doing…

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    #179998

    Ron
    Member

    Lorena,
    You would be correct in your assumption. That equation is only used in a limited application of a shewhart chart.

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    #179997

    Ron
    Member

    As a hiring manager responsible for lean six sigma personnel I look to various sources for people who have received a well rounded and hands-on lean six sigma training.
    As the auto industry dumps people into the marketplace I have interviewed several who received their “training” from automotive companies and they have not met my standards. 
    I was wondering if anyone has first hand knowledge of the training that is given and who gives it in the auto industry. Also if their is a company that anyone would state has a very good training program.
     

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    #179397

    Ron
    Member

    With the exception of the minivan almost every decision made by Iaccoca wasa flawed while he was at Chrysler.  He is hardly anyone to listen to.
     

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    #179330

    Ron
    Member

    By the way I did notice you also responded ….. sometimes you can’t help but to respond even if they are very basic..

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    #179329

    Ron
    Member

    Your admiration is noted !

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    #179322

    Ron
    Member

    Shaun,
    The reason most succesful six sigma programs have evolved into lean six sigma programs is that the basic sixc sigma tools were never designed to address issues such as you defined.
    Setup reduction is a basic implementartion tool in the lean toolkit.
    The basic concept is known using an acronym ICE   Internal Convetedd to External. This means you have minimal activities while the machine is down.
    The best “tool: to use is a video camera with seconds shown on the screen.
    Six Sigma tool: Detailed Process Map (made from Video)

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    #179321

    Ron
    Member

    The success of Six Sigma was partially due to the methodology of assessing the impact to the bottom line.
    To evaluate the utilization does not really make any sense. If you wish to evaluate the effectiveness of a BB or GB look to the numbers.
    I have witnessed many poorly implemented lean or six sigma initiatives and the key indicator is how they track and assess they impact of the projects launched.
     

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    #179320

    Ron
    Member

    Yield is around 99.4%  Sigma Level 4

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    #178901

    Ron
    Member

    The Cpk is the distance to the nearest specification. therefore in your case your equation (a) is the correct response.
     

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    #178861

    Ron
    Member

    Trudy,
    While a pareto chart can point you in a direction there is no statistical value behind the chart.
    Many false trails can be obtained by using an incorrect chart.
    Very obvious trends can be observed and in some cases that may be enough but usually you want to know more than what a pareto chart will offer.

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    #178860

    Ron
    Member

    Making some big assumptions here Gary.

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    #178859

    Ron
    Member

    As a person who hires people with your credentials I would look favorably on a Master Degree from a reputable university along with experience in the same field.
    Obtaining a “quickie” cert from a source other than a track proven organization such as Honeywell, or certain GE manufacturing sites and other know for a quality six sigma training program would serve no value to me.
    Obtaining a Greenbelt certification should take at least six month of proven project work after training. BB’s probalby 12 toi 18 months of successful implementation.

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    #178606

    Ron
    Member

    Stan,I don’t know if I am allowed to mention other names but one of the companies we were interested in benchmarking against was Global Productivity Solutions. Much to my surprise we outscored them although it was close. GPS does have a good reputation but our affiliation with Dr. Harry and Reigle but us ahead. Hope that helps clarify.

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    #178598

    Ron
    Member

    I am assuming CTQ refers to “Critical To Quality” if correct  productivity is not critical to quality..
    CTP I am at a loss what is this acronym for?

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    #178556

    Ron
    Member

    Stan,
    I should have clarified my response to state that we are one of the premier companies in the Michigan area. We came to that conclusion by doing a survey of employers and clients in the area. The results showed that people feel that we have some of the best training materials on the market, some of the most talented consultants, we are perceived as trusted advisers and our results are second to none. Although I am not at liberty to reveal our name or specific results, suffice it to say we are the top rated consultancy in the greater Michigan area. If you would like more information about our services, please provide a personal contact and we will be glad to send you some of our materials for review. A small refundable retainer is necessary to distinguish between the serious and just the curious. Thank you for your interest.

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    #178547

    Ron
    Member

    What will happen if I say who I work for? But since you asked, I work for one of the premier six sigma consulting companies and are located in the Detroit area. We specialize in cd based training for Lean and Six Sigma. We are proud that we are the best value in the business by providing excellent content at an unbelieveably low price. We are disciples of Dr. Mikel Harry and are proud that Reigle Stewart taught us about starting and running a successful consulting company. We also have a proprietary personality model that can predict success of a Green/Black Belt and Master Black Belt. Most of our talented consultants have at least five years in the field and have trained/coached dozens of Belts. I can’t mention the name in this post but if you are interested please post your email address.

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    #178533

    Ron
    Member

    Thomas,
    Rule of thumb we scope GB projects to be completed in 90 days this does not include the monitoring portion which is based on the effective cycling time of the process. That being said you should be completed through the Define phase in a week, Measure 3-4 weeks, Analyze 2-3 weeks, Improve, 2-3 weeks, control one week plus monitoring time previously discussed.
    For BB projects focus 120 days to 180 days depending on the complexity of the project (expectations are much larger for BB projects)

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    #178527

    Ron
    Member

    I prefer the recognized companies that have a proven track record of training competent six sigma advocates. I don’t hink I need to name them
    Regarding universiteis and consultancies..it’s a crap shoot..

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    #178526

    Ron
    Member

    Improvement projects are only as effective to improving the sigma level as the degree of input and scope of the project. Their is no relationship to sigma level and annual improvements…only that the better you get the tougher it is to continue to improve.
    But it is the challenge that gets the juices going and it seems like you have started well  Keep doing what you are doing and perhaps elevate to BB projects instead of just GB projects.

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    #178523

    Ron
    Member

    Don’t know who stan is but…. Six Sigma is contained in a methodology that is applicable to any organization that has processes.
    What types of organizations where you thinking of?

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    #178522

    Ron
    Member

    Perform a gage R&R using current data. If the results show a good measurement system then rely on the data (assuming all else has not changed).
    The beauty of six sigma is that you quantify the conclusions based on the risk of the  assumptions.
    Life is not contained in a statistical book and real BB’s have to make real decisions based on the information that is available and reasonable to obtain.

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    #178520

    Ron
    Member

    Thomas,
    It is not that simple. I think you need a greenbelt training or something like that. But Minitab (and the help program)can help you a lot.
    What I normal do:
    -1- avoid atributive data if possible. try to get continous data. Mostly always possible.
    -2-, use 3 persons to test, don’t help them, the SOP (standard operating procedure) must tell them what to do. When you help them you are obstructing the R&R-test.
    -3- use 3 samples or more to cover the whole range what is measured, grab them from the production line
    -4- randomize the sequence of tests (a minitab function)
    -5- spread it out in days
    -6- calculate the collected data in minitab, if the R&R<10%, it is a good measuring system about the R&R
    -7- R&R between 10 and 30% improve it with the colleted data where is the variation??
    -8- R&R above 30% it is a bad system, don’t use it.
    -9- don’t assume things, measure, measure, measure. The collected data will tell you the thruth, false measurements is also data and tells you that the system is not good enough.
     
     

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    #178501

    Ron
    Member

    FYI,
    a SIPOC IS NOT A PROCESS MAP. A process map is a detailed mapping of the various operations a thing going through the process experiences.
    A SIPOC is a tool used in the define phase to identify the customers their inputs and outputs and is so high a view that it is used only to define the area you are goinf after.
    At least in most cases.

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    #178500

    Ron
    Member

    When I was in the defense business 1 was random two a trend..seriously you need to put common sense in the application of the six sigma tools.
    Classical statistics to be thrown aside in many cases.. in low volumes from a customer perspective no defects are acceptable ; work off that premise and forget calculating a sigma value.
    You can of course convert the number of defects to a yield calculation and use one of the many charts available to convert.
    It also seems that you are not using the defect opportunities to calculate sigma.
     

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    #178316

    Ron
    Member

    Best anser..it depends
    We normally try to scope a GB project to be completed in 90 days and a BB project in 120 days.
    This we have found is the exent of time you can capture the attention of a team

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    #178315

    Ron
    Member

    Levent,
    I have never heard of this..sounds like you may have gotten your wires crossed at some time.
    I’d further suggest that any six sigma training be done outside of a University setting as academics rarely have a clue in the way six sigma was meant to be applied.

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    #178256

    Ron
    Member

    I’ll try it my next BB class and see how it runs.

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    #178252

    Ron
    Member

    Let’s get real…there are only a few real six sigma classes offered in the U.S. Obviously Dave did not participate in one of those.
    If you want six sigma to mean anything we all must require a basic standard. And that standard is that to be called a greenbelt you must be literate in the basic statistical tools and basic mastery of minitab.

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    #178251

    Ron
    Member

    While we all enjoy the expewrience of the statpult I do not agree with attempting its use for GR&R simply for the reason that it should fail miserably due to the inherent variables.
    I prefer to use a simple gage such as a caliper to micrometer to display the functions of a proper MSA. After this ecercise using a statapult may work to highlight a worst case scenario.

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    #178230

    Ron
    Member

    David,
    I’m shocked that as a Lean GreenBelt you are claiming not to have a basic understanding of statistics.
    I would question your training program based on your response.
    This website offer a great deal of background information for you to research.
     

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    #178229

    Ron
    Member

    Don’t fall into that trap! Sigma values are defined for a specific process and only make sense for the process you are working on.
    If you want to rate your company you can calculate your PPM level on outgoing quality as reported by your customers and convert that to a sigma level and refer to it as the outgoing quality sigma level.

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    #178034

    Ron
    Member

    You have fallen in the trap of modern man….
    In classical statistics you are not concerned with p-values.  You read the number at the intersection of the df and t value and compare it to your calculated t value and base your acceptance ofthe hypothesis on greater or less than the actual value.
    p values were created later to make it easier for nubbies to interpret.

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    #178033

    Ron
    Member

    Dustin,
     
    In a gage R&R you want the data to show a very small % contributon from the measurement system and a veryt large contribution from Part to Part variation (Process). That is really all you need to know.
    If your gage (measurement system) contributes largely to the variaiton then you cannot tell good from bad…need to improve your measurement tool.

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    #177991

    Ron
    Member

    You obviously got turned around at some point in your life..
    Conseervative is the longest “four” letter word in this country.
    Conservatives removed the Federal Regulations on the Banking industry and the results are obvious.
    Conservatives removed the restrictions on who could purchase oil options and the results are obvious.
    Conservatives (aka  American Taliban) are the greed mongers who refuse to become productive memebers in a world economy.
    As stated in previous postings the CEO’s of all of the companies in trouble are Conservatives who refused to change with the world economy. “I got mine screw you” mentality.
     
    Please….

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    #177988

    Ron
    Member

    Analyze the tasks not the team members.
    Since you did not state what this team was doing it is difficult to give you an answer.
    Standardize the processes to address the normal variation with the team buyin on the standardization.
    Once you have standardized processes you can determine the process capability.

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    #177972

    Ron
    Member

    The six sigma merthodology is basically a scientific approach to problem solving,using statistical tools to aid in the problem solving.
    To that end most researchers usethe basic tools without the formality and regimen taught in the six sigma traiining.
    So to answer your question I know of many pharmacuetical nd medical groups using six sigma and many consulting jobs are now focusing in ther medical area.
    So yes they are.

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    #177930

    Ron
    Member

    Your question begs further explanation:
    First if your data is normally distributed then using the mean is the preferred statistical approach to define measures of central tendency.
     
    If your distribution is not normal say binomial or toehr then perhaps the median is the best approach.
    Seldom is the Mode useful in sample statistics.
    You can use A comparison of the mean and median to give you a rough order of magnitude to determine normality as the closer they are the closer your distribution is to a normal distribution.
    The median is also less sensitive to extreme values.
     
    To specifcally answer your question as asked: Nothing.. you cannot determine skewness by having the two measures that you stated.
    To determine skewness..if yoou have the sdample dat jsut plot a histogram and you will see the skewness.
     

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    #177927

    Ron
    Member

    While the roots of six sigma were derived from Motorola it was michael Harry who sold it to Larry Bossidy at Allied Signal. Allied Signal perfected six sigma and based on the successful results Bossidy sold to to his good friend Jack Welch who marketed it to Wall Street via GE.
    So six sigma has many deriviations but the path to notariety came from its succesful application at Allied Signal and GE.
     
     

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    #177683

    Ron
    Member

    Many customers are requiring a Cp and Cpk of 1.67 short term and extended requirement of 2.0
    The idea is to have both measurements equal.

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    #177682

    Ron
    Member

    By definition Ppk is long term process capability to actually calcualte this Minitab takes into condideration all of the data you have and based on the information you give calculates the required result.
    Ppk is always sample data taken over a long period of time and in fact in minitab uses the actual formula for standard deviation most are familiar with versus the shewhart assumption of standard deviation.
     
    Hope this answers your question

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