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Appropriate In-Process Monitoring Frequency for 2X per day Change Set-Up.

J

Jojoj

#1
#1
What would be the appropriate die shear strength test monitoring frequency and sample size for a set up that is changing (change set-up/change device) 2X per day. Lot size is about 22K and the machine can process about 5-6 lots per day.
 
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bobdoering

bobdoering

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#3
#3
Jojoj said:
What would be the appropriate die shear strength test monitoring frequency and sample size for a set up that is changing (change set-up/change device) 2X per day. Lot size is about 22K and the machine can process about 5-6 lots per day.
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No way of knowing without some idea of the variation over time, and the causes of variation. Also, the frequency should consider teh risk of a special cause. If you check 2 times per day, are you willing to sort through 1/2 a day of work if the material was found to be out of control due to a special cause (such as chipped tool?) Is this for SPC, or "just checks"?
 
J

Jojoj

#4
#4
Thanks for your inputs Bobdoering. This is for SPC in-proces monitoring. Actually we will do data collection by performing die shear monitoring lot per lot for 1 week on the worst & best DA machines, then 1x per day afterwards for a month. This data is intended to better understand variations within the set-up, between set-ups, and other potential sources of variations. Do you think this is the way to go?
Currently, we are doing 1X/week in-process monitoring on top of the 2X per day set up buy-off, and we wanted to review if the frequency & sampling size of the current in-process monitoring is adequate.

We wanted to separate set-up buy-off (Set up control) from In-process monitoring (process control).
 
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