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Originally Posted by ricecrispi
My experience with acetal/delrin is it's good at absorbing impact (at certain angles). It doesn't responded as well as stress loading. That would be a better way to test the block. Lay it on angle so it's resting at the top on the outside edge of the top and edge of the inlet/outlets edge and press down on it. I thick the stress (weight) at that angle might form a crack over time. It will take the whack with hammer very well. Used in paintball for years now.
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concur. we've had several blocks in a vise under an estimated 400lbs of pressure for 4 days now. no cracks. Not surprising when one understands that the 0.030 spot is at the apex of an eliptic funnel. A cross-sectional view would show that the thickness increases as one moves away from the apex of the elipse until it reaches the maximum wall thickness of 0.045.
This block may have had a defect in the material in this area, but I can only guess at this point, as the customer never sent his block back for inspection.