Stampings of the Slide Texts would have been done prior to final prep steps for final Polish and then Blueing. This in order to remove 'raised Metal' around the Characters.It was my impression from something I read that lead me to believe the early usgi's were as highly polished as the commercial ones. The left side roll marks I believe are the same on both pistols and the only difference is the right side. Polishing would of occurred before applying roll marks and once it was applied on left, the right side roll marks were then applied for what that slide was going to. Maybe I read to much into it....I could be wrong though. I'm sure someone on here would know.
Well that answers that.... I will have to go back and see what the hell I was thinking while I was reading.Stampings of the Slide Texts would have been done prior to final prep steps for final Polish and then Blueing. This in order to remove 'raised Metal' around the Characters.
I assume the raised edges would have been removed via Draw Filing...and, from there, to Slides would go on to final Polishing.
There were successive grits on each of the several wheels used to achieve the final polish. The coarser grits removed the displaced metal and the finer grits created the desired polish texture. There is a good description of the polishing wheels and process in "A Century of Achievement 1836 - 1936."I do not know how the raised edges of Stamped or Roll Stamps characters were removed...
The final polishing wheel compound was described as being as fine as talc. Must have been a sight to behold seeing each stage of polishing being completed until that magnificent blue popped.Some of the "polishing" wheels as described by Johnny P. were coarse enough they threw a shower of sparks in use.
One possible reason for removing the circle from the Rampant Colt may have been die breakage. This picture illustrates the angle that the roll die contacted the metal, and with that being the only part of the die making contact caused it to be applied deeper than the rest of the die until the more complex part of the die came into contact with the metal. As the die was leaving the other side, it also displays the deeper stamp. This would apply unusual angle and pressures to these two points on the die.
The same pressure was applied throughout the roll die process. When only the leading edge of the circle touched the slide all pressure was directed on that one point of contact. If it had been a square, the pressure would have been distributed more evenly. As to not leaving accentuated displacement, I can only show you proof in the form of photos that it does.That's pretty weird..!
A Roll Die for this style Logo, would ( or should ) have been designed to 'roll' the impression in - the Die face itself would be 'rounded' in one dimension, in order to leave an even impression - and would not leave accentuated displacement at it's entry and exit.
Do all the Encircled Colt Logos on the slides of Automatics, show this effect?