Reducing Supply Chain Dependencies through Tooling Innovation

Reliability Improvement

To resolve manufacturing defects and accelerate 155mm cannon barrel production, Watervliet Arsenal (WVA) eliminated a costly, 76-cycle external supply chain loop for rifling broaches. By transitioning to high-precision internal Computer Numerical Control (CNC) sharpening, WVA increased tooling life by over 300%, saved an estimated $508,257.56 annually, and directly improved artillery availability for the warfighter.

Problem Statement: From FY21 through FY24, WVA experienced recurring defects in the 155mm rifling process. A Root Cause and Corrective Action investigation revealed that the specialized coating on rifling broaches was the primary cause of the defects. The legacy process involved a complex logistical loop for de-coating and re-coating broach sets (which include up to 68 separate dies) at an external vendor, creating severe inconsistencies, damaging tooling, delaying production, and negatively impacting weapon system readiness.

Description of the Innovation Solution: The solution eliminated the coating practice. WVA implemented a modernized, in-house approach that maintains tooling conditions through a rigorous CNC sharpening and internal inspection process. This proved precision sharpening alone delivers superior results.

Benefits to the Department of War (DoW) (Readiness & Affordability): This innovation severed a vulnerable supply chain loop and enhanced production agility and affordability.

• Efficiency and Cost Avoidance: Removing the external vendor cycle avoided $1,298,972 in contract awards and eliminated 1015 wasted labor hours spent on redundant inspections.
• Tooling Longevity: Uncoated broaches now last an average of 30 tubes before re-sharpening, a massive improvement over the legacy 7.22 tube cycle.
• Warfighter Readiness: Removing external vendor delays and rework, decreased the 155mm barrel production time by 12.08 hours per tool sharpening across 42 annual cycles, ensuring critical assets reach the tactical edge faster.

Scalability and Enterprise Impact: As the DoW’s sole producer of large-caliber cannon barrels, WVA is a critical node in the Organic Industrial Base. A bottleneck here degrades enterprise-wide readiness. Eliminating this external supply loop strengthened the entire howitzer systems supply chain.

This uncoated, high-precision CNC sharpening methodology is scalable to other production lines (105mm and next-gen prototypes). It also serves as a blueprint for other DoW depots and arsenals to eliminate costly vendor dependencies. Expanding this practice may yield 1,117 hours of reclaimed annual production capacity and over $750,000 in long-term cost avoidance.

Innovation Challenges: WVA overcame the entrenched assumption that coatings were mandatory. Extensive data validated this process change, proving precision CNC sharpening and internal inspections deliver superior tooling longevity without coatings.

Technical Maturity and Demonstration Results: This solution is fully implemented and actively delivering results. An extended Verification of Effectiveness (VOE) period confirmed the new process maintains optimal tooling conditions. WVA fully stabilized the process, mitigated defects, and now consistently achieves the new baseline of 30 tubes per tooling cycle