cess due to the design of the process, and affect all outcomes of the process
Identifying these types of causes requires methods such as Design of Experiment (DOE), etc.
Special Causes:
Causes that are not present in the process all the time and do not affect all outcomes, but arise because of specific circumstances
Special causes can be identified using Statistical Process Control (SPC)DefectUSLLSLnominal valueTolerancesLSL (lower specification limit)
10,7USL (upper specification limit)
10,9Acceptable partRejected PartRejected ProductNominal
10,8?0,1Rejected Part
A tolerance is a allowedmaximum variation of a dimension.
Measurement Report
In most cases we measure only one part per cavity for measurement reportExample of Capability Analysis DataFor some critical dimensions we need to measure more than 1 part
For capability data we usually measure 5 pcs 2 times/hour=100 pcs (but sampling plan needs to be made on the basis of production quantity, run duration and cycle time)
……………………
