Quote:
Originally Posted by Mike Franzen
So they stamped it “Overload Proved” before they tested it?
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That’s a good point Mike, and it occurred to me me that the subject has been discussed before. The original question was, did they test fire every gun with an overload, proofing shell. I don’t remember the consensus but if they did, then Brian’s theory that they used a mandrill the keep it round would make sense.
On the subject of stamping, I’ve probably related many times, that my serious working career (as opposed to 9 years on ships which never seemed like work) was in the steel foundry business. Every casting, from 20 pounds to over 20,000 pounds, had lots of stamped letters, indicating heat lot, and inspection marks. Much of this work was in high strength alloys the high brinnell hardness. Industry standards required that stamping be done with “Low Stress” stamps. Stamps with very sharp character edges were considered high stress and the resulting impressions could propagate cracks.
All of the stamping we see on barrel flats have sharp impressions and I often wondered if this practice predated the standards for stamped impressions.
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