BTDT has a point. Depends on the number of people involved.
First step is to agree the ground rules. Everybody has a voice, no idea is a bad idea etc. Stick to this rigidly. Do not be afraid to challenge inappropriate behaviour.
The post its and affinity diagram have worked well for me in the past (even with a room full of engineers).
The view that Paul has given is correct. I would highlight that most failures are not linear using eta and beta are better estimates for MTTF, etc
Have a look at http://www.weibull.com
Also there are many software packages out there that can help with determining the optimum time for Preventative maintenance. One that I have use before is…[Read more]
There are several methods for looking at this. Look at the spread and mean of your data, rather than upper and lower limits. You can then more effectively determine your defect rate for your customer limits.
RSS is Ok for a linear relationship, or try a non-linear method if not (monte carlo work well in minitab and is easy to do). There are many…[Read more]
Not sure what you are trying to do here. Are you going to purchase a camera or are you producing a camera? If you are producing a camera then why not use the customers intent to purchase rather than useability. All cameras might be equally useable, but the customer may still not purchase, as they all have equally bad useability.
If you use intent…[Read more]
BBMole replied to the topic New Product Introduction and Process Qualification . in the forum General 16 years, 3 months ago
If you are doing things right, then ask the designers for their six sigma design reports. The right place to sort problems out is at the design stage, making the design robust, design for manufacture, etc, etc.
The design guys should be able to supply you all this information.
Then look at the performance of the cells.
I agree that time is what should be tracked, Although depending on order numbers, X-bar R or S may be more appropriate. It may be worthwhile tracking the individual order item times, as this may help with root cause later. From what you say this may be more appropriate. If all order items are tracked individually you should be able to see the…[Read more]
BBMole replied to the topic Do we have a metrics called process stability index in the forum General 16 years, 4 months ago
FYI Darth on the isixsigma website under S
StabilityStability represents variation due to elapsed time. It is the difference between an individual’s measurements taken of the same parts after an extended period of time using the same techniques.Also, PROCESS STABILITY INDEX is often used in SPC where many charts are ranked by the %OOC…[Read more]
Why not use reliability figures. If you have these for even one failure, then you can determine the best preventative maintenance schedule for you set up. I think that the MBB would find it hard to argue with these numbers, as they are based on your experience with failures.
Look for Dr Robert Abernethy on the Web
Cost is always a concern. Even in Mike’s mining example of worldwide shortage, there is a diminishing return. You could use the stability index of the process as a measure. I disagree that the end customer does not care about how you reach control. If it costs them more money, then they care. If the lead time is longer then they care. Anything…[Read more]
Totally agree Stan. The other thing is to be consistent and write down the rules for opportunities. Some organisations standardise the rules, in order that there is consistency across all processes. Do this and you don’t get finance, ending up better than manufacturing, design, etc,etc
Levels the playing field for eveyone. Also stops people or…[Read more]
Ask yourself would you spend your own money on a process that is out of control. Too often we forget the bottom line. What is it worth to get into control.
Try this look at all the processes, and decide which one has the best average, I know I can’t believe that I am saying this, also look at the variance of each process. Using these numbers…[Read more]
I would suggest that you be careful when interpreting the results. Often I have seen BB use Shift as a factor. This can only be assumed if the same personnel do the same job every shift. If the workforce is multi skilled you may observe effects that are due to different people doing different jobs during successive shifts. Net result is that each…[Read more]
In complete agreement Mike, apart from the tracking part.
The main purpose I saw and used was for best practice, not wanting to re-invent the wheel every time. If you have the contacts and reports, etc this helps a lot, especially with a large organisation. It should also not be limited to just SS projects, but all projects. The GE system is very…[Read more]
Having seen this done in a large organisation (more than 40K projects), the solution was bespoke. Very useful tool.
Depends how many projects you are looking at. Do you want it to e searchable?
Try using a database program, define your requirements, ie searchable, number of projects, etc and have a standard from that everyone fills in.
You may…[Read more]
30% is a rule of thumb as acceptable, in most cases. 10% is used to indicate an excellent measurement system. It depends what you are looking to do. If you can live with 30% why spend extra cost to reduce the variation. Six sigma as always is a balance against the cost of getting to the desired quality level.
I worked on a project a couple of years ago that had DSO as the primary metric. It took about 6 months and we acheived a reduction of of circa 20% in the DSO figure. I would suggest that you need a willing finance and sales department, and the backing of the company to enforce revised credit sales/terms. There can be conflicts with the sales g…[Read more]
Simply put DFSS is about defect Prevention rather than Detection.
If you Design, a product/process right first time, you don’t get defects.
There are many acronyms used, but they all end up at the same set of tools.
If the measurement is not ranked then use a Kappa study.
If it is ranked use Intra Class Correlation.
I have used both in the past when training and also in practice.
The main problems with them is finding the right tool to make the statistics easy. My own organisation has good excel spreadsheets for both, and I am sure that some will exist on the web.
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