PRODUCT ENGINEERING DESIGN STUDY OF CARTRIDGE, 37MM, SPOTTING, XM415
LAKE CITY ARSENAL INDEPENDENCE MO
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The product engineering design study of Cartridge, 37mm, spotting, XM415, which is a sub-caliber component of the XM29 Weapons System is reported. Experience gained at Lake City Arsenal in the production engineering and initial manufacturing phase of Cartridge, 20mm, spotting, XM101, was fully utilized and applied. Twenty-one completely dimensioned and annotated component drawings were generated, but no actual metal parts were made or tested. The modified cartridge case is similar in basic design to the 20mm XM154. Two case plugs of different internal volume fit the case body to provide the two ranges required of the spotter round. The case wall thickness is the minimum which will safely withstand anticipated excess chamber pressure requirements without additional heat-treatment. The projectile was simplified and improved by changing to a conventional one-piece body with a male threaded fuze intruding into the mouth. Several internal changes were made for simplification of manufacture, assembly, or both, and several components were eliminated thereby. The counterweight was changed from lead to D-38 which was a major factor in the increase of the payload by 23 over the Picatinny Arsenal projectile.
- Ammunition and Explosives