Mixed data collection (SPC) for different mold cavities

#1
Hi,
My company is producing rubber parts for automotive customers. We have a new prodcut with a very-high-number-cavity tool. Cavities are not identified. We have to perform SPC for a certain product parameter, but it is impossible to do it per cavity.
Till now we work with max. 4 cavity tools, so the separated data collection per cavity was not an issue. Does it make sense to make SPC without cavity-differentiation?
 
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#2
Re: Mixed data collection (SPC) for diff. cavities

you'll never know until you try...
it might be possible if there is very little difference between cavities.

the complication here is that the within subgroup variation is controlled by the fixed cavity to cavity differences and the sugbroup to subgroup variation is controlled by the shot to shot factors.

so you might also try two separate charts. the first is an IMR chart for the subgroup averages and then a R or S chart for the within subgroup variation...
 
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