Big Red's Battle Blog RSS

M-1 Helmet Production Breakage VI - Deja Vu Supplemental contracts meant to help make up for breakage losses actually increased losses.

M-1 Helmet Production Breakage IV Metallurgy, Fabrication and Residual Stress Heat-treating steels for maximum hardness is a delicate scientific process requiring precise supervision to avoid weak pockets in the final sheet stock whereas cold working Hadfield’s manganese to the same level of strength makes this unnecessary.

M-1 Helmet Fabrication I - The M-1 Conquistador Occasionally, relics of the M-1 helmet’s manufacturing process end up in the hands of collectors.

M-1 Helmet Shaping Operation III - Visor Spanking The spanking operation bent the visor of the helmet back down in the opposite direction of the initial draw.

M-1 Helmet Production Breakage III - Understanding Why Helmets Cracked A brief review of how “residual stress” in a finished helmet body was affected by a combination of poor-quality steel, poor manufacturing habits and the design of the helmet.