Parker Bros overload proved stamp

[edgarspencer]

Originally Posted by J. Scott Hanes

Is there any description known about how / if the barrels were supported when these stamps were applied? It would take some force to put them in place so that they appeared equally impressed.

Quite right, and with enough pressure to deform the chamber, so it makes sense that it was stamped prior to finish boring.

[Dean Romig]

Originally Posted by edgarspencer

Quite right, and with enough pressure to deform the chamber, so it makes sense that it was stamped prior to finish boring.

Then how would we explain the lack of chamber deformation resulting from Remington Arms stamping date codes when a gun was in for service or repairs...?





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[edgarspencer]

Originally Posted by Dean Romig

Then how would we explain the lack of chamber deformation resulting from Remington Arms stamping date codes when a gun was in for service or repairs...?

I hope that was a rhetorical question. The amount of pressure necessary to impress the tiny font of the Rem repair code stamps is only a minuscule fraction of the pressure necessary to impress the proof stamp.

Take a pencil eraser and push it against your finger tip. Now take a common pin and apply the same pressure. If that doesn't help explain it, try the above test on your.....oh, never mind

[Dean Romig]

Originally Posted by edgarspencer

I hope that was a rhetorical question. The amount of pressure necessary to impress the tiny font of the Rem repair code stamps is only a minuscule fraction of the pressure necessary to impress the proof stamp.

Take a pencil eraser and push it against your finger tip. Now take a common pin and apply the same pressure. If that doesn't help explain it, try the above test on your.....oh, never mind

1. No Edgar, it wasn’t a rhetorical question at all.

2. But you will notice that the Remington date codes were stamped to a greater depth, for the most part, than the Overload Proved stamps so what does this say to you Edgar?

3. I couldn’t find a pencil Edgar… (please refrain from a witty reply… it’s too late to match wits with you.)





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[edgarspencer]

Originally Posted by Dean Romig

1. No Edgar, it wasn’t a rhetorical question at all.

2. But you will notice that the Remington date codes were stamped to a greater depth, for the most part, than the Overload Proved stamps so what does this say to you Edgar?

3. I couldn’t find a pencil Edgar… (please refrain from a witty reply… it’s too late to match wits with you.).

Re: 1, I was giving you the benefit of the doubt.
2, The smaller the font (sq. area of the stamp) The less force required to
be effective, and the less mass it will displace.
3, I can send you one.

[Mike Franzen]

Originally Posted by edgarspencer

Quite right, and with enough pressure to deform the chamber, so it makes sense that it was stamped prior to finish boring.

So they stamped it “Overload Proved” before they tested it?

[edgarspencer]

Originally Posted by Mike Franzen

So they stamped it “Overload Proved” before they tested it?

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.