Tool Bits and Drills for Machining Armor Plate Open PDF Document Details Document Type Technical Report Publication Date May 04, 1937 Accession Number ADA951233 Entities People D. J. Crawford Tags DTIC Thesaurus Topics Armor Armor Plate Casting (Fabrication) Clearances Drills Hardness Machines Machining Materials Rake Angles Sand Casting Standards Steel Thermal Conductivity Tool Steel Tools