From CNC to MIM: Automotive Brake Case Study

Industry	Automotive — Two-Wheeler / Motorcycle Manufacturing
Component	Brake Lever Reach Adjuster
Client Profile	Tier-1 Automotive Supplier to OEM Assembly Lines
Technology Applied	Metal Injection Molding (MIM) — Low-Alloy Steel
Previous Process	Conventional CNC Machining
Outcome	High-volume daily output, significant per-unit cost reduction, near-zero rejections
Confidentiality	Client and OEM identities withheld per NDA. Results based on actual project data.

The Problem

The Problem No One Talks About in Brake Component Manufacturing

Every motorcycle rider trusts their brakes. But few think about the small metal adjuster that lets them position the brake lever at exactly the right distance from the handlebar — the reach adjuster. For riders of different hand sizes, this isn't comfort engineering. It's a safety function.

For a well-established Tier-1 automotive supplier delivering this component to OEM assembly lines across India's two-wheeler market, the reach adjuster had become something unexpected: a production liability.

The part was being machined conventionally. And as motorcycle OEM demand accelerated — driven by expanding model variants across commuter, sport, and premium segments — the limitations of CNC machining were compounding into a genuine business problem.

The Core Question the Client Brought to Us:

"We know MIM exists, but we've never applied it to this category. Can it really handle a brake component — one that goes into a safety-critical assembly on high-volume OEM lines — with the precision, cost, and throughput we need?"

Core Challenges

The Core Challenge: Three Compounding Problems

What the client faced wasn't a single isolated issue. It was three interconnected manufacturing problems, each amplifying the others.

CNC Throughput Could Not Keep Pace with OEM Demand

The brake lever reach adjuster's geometry — adjustment slots, precise hole placements, threaded and stepped features, tight dimensional tolerances — required multiple machining setups per part. Each setup meant tool changes, machine repositioning, and careful operator handling. The result was a production rate that couldn't scale. The client was running CNC machines at full capacity and still falling short of delivery commitments. Scaling up the conventional way — more machines, more operators, more floor space — would have meant heavy capital expenditure for a part that OEMs priced aggressively. The economics didn't work.

Per-Unit Cost Was Incompatible with OEM Pricing Expectations

Automotive supply chains are unforgiving on pricing. OEMs expect year-on-year cost reductions as volumes increase. CNC machining was moving in the opposite direction. As a subtractive process, CNC started with a solid metal billet and cut away significant material to arrive at the reach adjuster's final shape. Material wastage was substantial. High labor input, long cycle times, and accelerating tooling wear made the per-unit cost difficult to defend — especially at the volumes the OEM required. The client needed a process that got cheaper at scale, not one that plateaued or increased.

Geometric Complexity Was Generating Inconsistency and Rejections

The functional geometry of the reach adjuster — the precise slot that enables smooth incremental adjustment, the contact surfaces that must align with the brake lever body, the small structural features holding the assembly together — was difficult to machine consistently across large batch sizes. Multi-step CNC processes accumulate variation. Each setup, each tool change, each operator shift introduces a small but compounding source of deviation. For a brake-system component, even minor dimensional inconsistencies were unacceptable. The client was seeing quality rejections at OEM incoming inspection — and the rework cost was further eroding margins that were already thin.

The Root Cause:

CNC machining is an excellent process for prototypes, low volumes, and parts requiring post-machining. But for a geometrically complex, safety-critical component at automotive OEM volumes and pricing — it is the wrong tool for the job. The client knew this. What they needed was confidence that MIM was the right alternative.

The Solution Logic

Why Metal Injection Molding Is Built for Components Like This

Metal Injection Molding (MIM) combines the design freedom of plastic injection molding with the structural integrity of fully dense sintered metal. The process produces near-net-shape components — meaning the final part geometry is formed directly in the mold, with minimal or no secondary machining required.

For the brake lever reach adjuster specifically, MIM offered a precise match to the problem:

Single-cycle geometry: The part's adjustment slots, contoured surfaces, and precision hole features could all be formed in a single molding cycle replacing multiple CNC setups with one controlled operation
Near-zero material waste: MIM uses only the feedstock material needed to form the part. Material utilization is dramatically higher than billet machining, which discards significant metal as chips
Process repeatability at scale: Once the mold tool is qualified, every part produced is a replica of the last. Part-to-part variation is controlled by the tool and process parameters, not by operator skill or setup variability
Throughput advantage: MIM cycle times are far shorter per part than multi-setup CNC operations. A single qualified tool can produce high daily volumes, and additional tools can be added if capacity needs to grow

Our Solution

Our Solution: From Feasibility to Full-Scale MIM Production

The client's engineering team had not previously applied MIM to brake components. They came to us not just for a price quote, but for a manufacturing partner who could assess feasibility, develop the tooling, validate the part, and deliver at production scale. We structured our engagement in four stages.

Stage 1 — Component Feasibility Assessment & Material Selection

Stage 2 — Precision Mold Tool Design & Development

Stage 3 — Sample Production, Testing & First Article Inspection

Stage 4 — Ramp to Full-Scale Production

From Challenge to Results

Results & Outcomes

The shift from CNC machining to MIM delivered measurable improvements across every dimension the client cared about. Here is what changed.

Output: Thousands of Parts Per Day

The most immediate result was the transformation in daily throughput. MIM now produces in volume from a single qualified tool what CNC machining required multiple machines and shifts to approach. The client moved from struggling to meet OEM delivery schedules to operating with comfortable production headroom — able to fulfil large purchase orders reliably and on time.

Quality Consistency: Near-Zero Rejections

Because every part originates from the same precision tool under controlled sintering conditions, part-to-part variation dropped dramatically. The client reported a significant reduction in rejections at OEM incoming inspection. Process capability scores improved, strengthening the client's standing in OEM supplier qualification audits — a critical competitive factor in the automotive supply chain.

Cost Per Part: Substantially Reduced

The switch to MIM delivered a significant reduction in per-unit cost. Material waste dropped to near zero (MIM uses only what's needed to form the part). Fewer process steps replaced the multi-setup CNC sequence. Labor input per part fell sharply at volume. Secondary machining operations were eliminated entirely. Together, these changes allowed the client to meet OEM pricing expectations while protecting their own margins.

Safety Confidence: A Validated, Traceable Process

Safety Confidence: A Validated, Traceable Process The brake lever reach adjuster is directly involved in how a rider operates their brakes. Moving to MIM did not compromise safety — it enhanced manufacturing control. Every production part now comes from a validated, repeatable process with traceable material and process parameters. Both the client and the receiving OEM have greater confidence in the component's in-service reliability.

Takeaways for Automotive Suppliers

Key Takeaways for Automotive Component Manufacturers

Process selection matters

MIM is not a niche alternative to machining — for high-volume, geometrically complex metal components, it is frequently the superior primary process

Safety-critical components are within scope

The brake lever reach adjuster demonstrated that MIM can be applied confidently to safety-critical automotive components, provided tooling, material selection, and validation are engineered rigorously

Cost trajectory is sustainable

The combination of near-zero waste, fewer process steps, and automation-compatible throughput creates genuine commercial impact in OEM supply chains that demand year-on-year cost improvement

Consistency scales with volume

MIM's inherent repeatability — driven by a qualified tool and controlled process, rather than operator variability — naturally generates the consistency that OEM quality systems require

The Bottom Line

Conclusion: Manufacturing Intelligence, Not Just Manufacturing Capacity

The brake lever reach adjuster is exactly the kind of component MIM was engineered for: small, geometrically intricate, mechanically demanding, and required in volumes that expose every inefficiency in a conventional machining process.

What was a production bottleneck for our client is now one of their most efficiently manufactured components — flowing reliably into the assembly lines of well-known motorcycle OEM brands, at a cost structure that works, with a quality record that strengthens their supplier position.

Our contribution went beyond quoting a price per piece. We brought engineering expertise in feasibility analysis, tool design, material selection, process validation, and quality assurance — making the transition from CNC to MIM fast, controlled, and commercially impactful.

That is what a genuine manufacturing partnership looks like.

Is Your Component a Candidate for MIM?

If you manufacture small-to-medium metal components with complex geometry, tight tolerances, or high-volume requirements — and your current process is creating cost pressure, throughput limitations, or quality variability — we would like to evaluate your component. Reach out to the Zealot Inc. engineering team to begin a no-obligation feasibility discussion.

Schedule a Technical Consultation

Engineering Consultation

Ready to Evaluate Your Component for MIM?

Reach out to the Zealot Inc. engineering team to begin a no-obligation feasibility discussion. We assess geometry, mechanical requirements, tolerances, and production volumes to determine MIM suitability — typically within 5–7 business days.

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