Do you implement real SPC not just a paper work?

C

cqt18060180

#11
Re: Do you implement the real SPC not just a paper work?

Hi cqt

SPC covers a very wide range of things. It's not just monitoring your output. You also monitor the things that affect what you make.

Suppose you have 3 machines making a part, a CNC lathe cutting a part to a particular diameter. You have a problem with the diameters. They are not all 50mm +/-0.05mm.

If you look at the output of each lathe individually, you might find the following:
Lathe 1- 50mm +/- 0.03mm
Lathe 2- 50mm +/- 0.02mm
Lathe 3- 50mm +/- 0.09mm

In this case, the problem is lathe 3. Now you know what the problem is, you can do something about it. Once you have fixed the problem, you need to stop the line less often.

NC
.....yes
 
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C

cqt18060180

#12
Re: Do you implement the real SPC not just a paper work?

but you i mean the most difficut is the trend is to abnormal but in the limitation of SPC, this time means you should make some action, right ? and the next step come from you thread is make some adjustment on parameters , but so many parameter before you find the contributor factors
 
N

NumberCruncher

#13
Re: Do you implement the real SPC not just a paper work?

Hi cqt

Yes, you need to find what factors affect your process. Then you need to find out what are the most important factors and control these first. This may take a long time.

One possible starting point is a fishbone diagram (Ishikawa diagram). You write down the factors that may affect your process.

You need to use your engineering knowledge and ask the people who operate the process. Which factors do you think have the biggest effect? Investigate those first. Reduce the variation and look at your output.

If your process hasn't improved, you need to look for other factors.

If your process has improved, you still need to look for other factors.


And so on.

SPC is NOT a single event. "We have done that, now we can stop". :nope:

SPC is a process. SPC must happen every day, for the lifetime of your company.:yes:

Look for books on manufacturing an get ready for years of hard work.

I hope this has been some use to you. What you need to do next is look for books on manufacturing and start learning. Get ready for years of hard work. :read:

NC
 

bobdoering

Stop X-bar/R Madness!!
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#14
Re: Do you implement the real SPC not just a paper work?

Yes, you need to find what factors affect your process. Then you need to find out what are the most important factors and control these first. This may take a long time.

One possible starting point is a fishbone diagram (Ishikawa diagram). You write down the factors that may affect your process.
Good point - for a clearer approach to SPC implementation steps, look at this link.
 
P

PigPiG

#15
Re: Do you implement the real SPC not just a paper work?

I will say that the undestanding of SPC for the users(manufacturing, engineering, maintenance) are very important too. Else, this will be meaningless. Most of the manufacturing factory having mis-understanding on SPC where they thought that the SPC violation alert is an extra downtime for them. Some of them even thought that SPC should tell them what is going wrong with their own process without perform any investigation. When it does not tell them what was the "root cause", they said that it was meaningless for them.
 
C

cqt18060180

#16
No qualification most of them, experience is a must on quality

we have a license equal to ASQ
 
P

PigPiG

#17
In my company, the engineers even do not look at the chart...:mad::mad:
They even can not answer simple SPC question during customer audit....:frust::frust::frust:
 
S

silentrunning

#18
In our company we have automatic machines that measure parts as they run. In the early days these machines would overcompensate and run long / short / long / short etc. Now they have built in SPC programs that allow them to make "intelligent" adjustments. We run much less scrap than we used to 20 years ago.
 
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