Pre-control Software

D

dbzman

#1
Hi everyone!

Is thers someone who has some free pre-control chart software?

I would even use an Excell add-in.


Mike W :biglaugh:
 
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Mike S.

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#2
I don't know of any software, but it is so easy you can make a form in Excel or Word very easily. I had a file where I did it -- if I can find it I'll send it along. Just make a horizontal line, show the red, yellow, green zones along it with places to record the tolerance values that go there, and then maybe add a small chart for logging data, or even the pre-control rules. It'll fit on one page. It is so easy I doubt any software people made anything.
 
A

Atul Khandekar

#3
I agree witH Mike. It should be fairly easy to set up a pre-control chart in Excel. I just have one thought to add:

Unlike SPC charts, the sampling frequency for pre-control is not fixed. It works on a penalty/incentive principle. If you have many stoppages, pre-control requires you to obtain samples more frequently. On the other hand, if you have a good process with very few stoppages, you can afford to reduce the frequency of sampling. The frequency is calculated by dividing the time between two stoppages by 6.

If you want to take advantage of this feature, I think, it would be nice if the software that you use/develop is able to automatically calculate the time for the next sample and "call out" for a sample. JMHO.

-Atul.
 
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