Ersatz model 1895 converted to ersatz 1915

Woytek and Clovis,
Great team work on the whole process of restoring this 110+ year old piece of history. I have been on several forums and many members take offense when someone points out something that may be overlooked or not noticed but here it is a truly different story. Again, great advice Clovis and truly wonderful piece of work Woytek!
Best regards,
John
 
Rkinkade said:
In regard to the manufacturing method that produces the radial lines, it is called spin forming. I worked for a company that purchased steel end caps that were produced using this method. I saw the process. A turning lathe is used to spin a flat steel blank. The motor end of the lathe has a wooden fixture shaped like the finished product. The tail stock end of the lathe has a pressure pad that holds the blank against the wood form. A tool rest perpendicular to the blank has a pivoting long handle with a rounded working end mounted to it that is levered against the blank as it spins. The metal blank is thus formed against the wood form. The steel had a 10% lead content making it malleable. The radial marks are from the tool end and the stretching of the metal as it spins. I suspect our subject helmets required a final process where the visors were integrally formed in a mechanical press and a rim was then rolled.
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