Originally Posted by
lysander
The extraction force drops with increased clearance. At zero pressure, a clearance of 0.000", the extraction force is about 100 pounds, at a clearance of 0.005" the extraction force is nearly zero.
If there is pressure inside the chamber, it is pushing the case walls outward, but it is also pushing the case out of the chamber. The force pushing the case out of the chamber subtracts from the extraction force, if this chamber pressure force pushng the case out is greater than the friction force from the case-wall interaction, the extraction force will be negative.
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