How MES Helped Honeywell Stabilize Production at Scale

Manufacturing systems tend to reveal their weakest points slowly. As small variations accumulate, what once felt manageable can begin to strain production, quality, and delivery.

For companies that design and manufacture highly engineered systems—especially those expected to perform reliably in complex, real-world environments—this loss of alignment carries real risk. Honeywell operates at that level, building industrial automation, building technologies, aerospace, and energy solutions where consistency and reliability are not just foundational, they’re critical.

Within Honeywell’s supply base, tooling condition, process capability, and supplier discipline fell out of alignment, allowing inconsistencies to accumulate over time. Honeywell made the decision to move away from its incumbent diecasting supplier, which could no longer sustain the quality and delivery performance required for aluminum covers used in MICRO SWITCH™ limit switches.

These components are not incidental. They are structural, tolerance-sensitive parts whose performance directly affects product reliability in demanding industrial automation environments.

Addressing the immediate disruption required a change of supplier. The more complex challenge, however, was restoring manufacturing control.

Honeywell reached out to MES to help execute a tooling transfer and production recovery project grounded in engineering rigor, system-level thinking, and scalability.

How Diecasting Quality Impacts Reliability in Complex Systems

MICRO SWITCH™ limit switches operate in environments characterized by vibration, dust, moisture ingress, and wide temperature swings. Under those harsh conditions, even small geometric or material inconsistencies can introduce functional risk.

In a precision electromechanical assembly, component geometry, material behavior, and interface stability work together to determine overall performance. For MICRO SWITCH™ limit switches, the diecast aluminum cover is a primary structural element, meaning variation at the component level can propagate directly into system-level risk.

The diecast aluminum cover performs multiple system-level functions:

• Maintains mechanical alignment of snap-action mechanisms.
• Provides environmental sealing against contaminants.
• Delivers dimensional stability under thermal and mechanical load.
• Absorbs impact and vibration in industrial use.
• Interfaces with downstream assemblies where small dimensional differences can affect fit and alignment.

 Engineering implication:
Variation at the cover level does not remain localized. It propagates into assembly fit, sealing integrity, actuation reliability, and ultimately field performance.

These are not commodity castings. They are tolerance-critical components that enable system reliability.

Overcoming Tooling and Process Challenges in High-Complexity Diecasting

By the time Honeywell initiated the supplier transition, the issue was systemic and no longer isolated to individual defects or missed shipments. Variation increased, quality performance deteriorated, and delivery reliability suffered.

Complicating matters further, the tooling itself presented significant constraints. More than 70 diecasting tools needed to be transferred, many without access to original tool designs or part drawings. Several arrived in poor mechanical condition, and some part numbers required additional manual operations to meet dimensional requirements.

Observed conditions included:

• Tool wear progressing without structured intervention.
• Inconsistent control of process windows, leading to dimensional variation.
• High rejection rates without sustainable root-cause resolution.
• Delivery instability tied directly to variable output.

 Manufacturing implication:
When tooling condition and process control degrade together, quality and delivery failures make recovery exponentially harder. By the time Honeywell initiated the transfer, MES inherited uncertainty rather than a stable baseline, requiring a deliberate, engineering-led approach to reestablish control.

Managing a Large-Scale Diecasting Tooling Transfer Under Active Production

This effort was not a conventional supplier transition. MES was tasked with recovering, stabilizing, and restarting a complex diecasting portfolio while production demand remained active.

The scope required MES to take ownership of both the physical tooling and the manufacturing system surrounding it, often without the documentation or baseline conditions typically available in a transfer of this scale.

MES assumed responsibility for:

• Transferring 70+ diecasting tools to Mexico.
• Evaluating tooling without original designs or drawings.
• Recovering molds in poor mechanical condition.
• Stabilizing parts requiring secondary manual operations.
• Restoring production under live supply-chain expectations.

 Operational implication:
Without a controlled recovery approach, the risk was not just delayed startup. The greater risk was the introduction of new, harder-to-diagnose failure modes during restart. MES needed to diagnose, correct, and stabilize the manufacturing system under live supply-chain conditions.

Engineering the Recovery: Restoring Tooling and Process Control

MES approached the recovery as an engineering problem, not a production sprint. Before output could increase, the manufacturing system itself needed to be understood, corrected, and stabilized.

With original tool designs and part drawings unavailable, MES engineers evaluated each diecasting tool based on how it was performing in production. The focus was on identifying the factors most likely to affect consistency, defect risk, and long-term repeatability across a diverse and interdependent tooling portfolio.

Each tool underwent engineering evaluation focused on:

• Gate and runner integrity and flow balance.
• Wear patterns influencing fill consistency.
• Core and cavity alignment affecting geometry.
• Venting effectiveness and defect risk.
• Dimensional repeatability across cycles.

Rather than defaulting to replacement, MES prioritized targeted refurbishment and corrective action to restore functional capability where possible. This approach reduced the need for immediate capital reinvestment while preserving continuity across the broader project, both of which are critical under active production constraints.

Once tooling condition was addressed, MES turned to process stabilization. For tolerance-sensitive diecast components, consistency depends on maintaining controlled and repeatable process windows. MES established parameters to manage mold temperature stability, fill behavior, and shrinkage characteristics to support dimensional consistency across production runs.

Where secondary manual operations were required to meet dimensional requirements, those steps were standardized and integrated into the overall process flow rather than treated as exceptions. This reduced variability introduced outside the primary diecasting process and improved repeatability at the assembly level.

The objective was not short-term conformance, but the establishment of a manufacturing system capable of producing consistent results over time.

Engineering implication:

By stabilizing tooling condition and process control together, MES addressed variation at its source, enabling improvements in quality performance and delivery reliability without introducing new risk during scale-up.

Conclusion

Restoring manufacturing performance requires more than restarting production. It requires reestablishing control across tooling, process, and execution, especially when operating under active demand and real-world constraints.

By approaching the challenge as an engineering recovery rather than a production restart, MES helped stabilize a complex diecasting project and reestablish the conditions needed for reliable quality and delivery. The result was not short-term output, but the creation of a manufacturing system capable of sustaining performance.

By treating the challenge at the system level, MES helped Honeywell move from supplier disruption to manufacturing control, reducing risk while supporting scalability.

Want to learn more about MES’s tooling transfer and manufacturing recovery capabilities? Contact us.

Project Snapshot

• Customer: Honeywell
• Product Line: MICRO SWITCH™ limit switch components
• Component: Diecast aluminum covers (largest and most complex component in the assembly)
• Total Tooling Scope: 70+ diecasting tools
• Manufacturing Process: Aluminum diecasting with secondary operations
• Geographic Footprint: Tool transfer from California; production in Mexico; inventory and logistics support via MES Ohio warehouse
• Project Duration: Multi-year execution (2022–2024)
• MES Capabilities Deployed: Tool transfer and recovery, diecast manufacturing, process stabilization, quality management, inventory management, and global logistics
• Quality & Compliance: ISO 9001-certified systems; IMMEX / VAT-compliant cross-border manufacturing
• Business Outcome: Restored production continuity and establishment of a strategic supplier relationship