Expansion M/C Capability

M

Mohesham

#1
I have a process where I want to open a gromment using a grommet expansion M/C.

The process starts when i first place a grommet on the M/C which is adjusted on a preset expansion value to open the grommet.

I have a critical dimension (min value) that the opening must be not less than it. If the opening is too large the grommet might torn out (becomes defected).

I want to do a m/c capability for the expansion m/c but don't know which limits to use can anyone help.
 
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G

GTJones

#2
Hi

I presume that due to you having a Min Tolerance that is critical? you would need to look at the data using Log-Log (Skewed Distribution) as if you apply Normal distribution your Control limits would not reflect the required Product Characteristics, therefore i would calculate the Std Dev using Log-Log.

Although you need to calculate the degree of Skew to be sure?

Check out Wikapedia for more information just type in Skewness


Regards

Gary :thanx:
 
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