ENGINEERING AND MANUFACTURING SERVICES
Solving Engineering & Supply Chain Challenges for OEMs
Engineering & Manufacturing Solutions Designed for OEMs
Guided by Franklin Covey’s Big Rocks philosophy, we focus on what drives success in manufacturing and engineering. With 50+ years of experience and state-of-the-art facilities in Missouri, we deliver high-precision manufacturing and engineering solutions tailored for OEMs.
Our expertise ensures that OEMs can scale production, enhance quality, and streamline processes—all with a trusted partner who understands their challenges. Our core capabilties include
- Engineering Services: CAD Design, New Product Development, and Reverse Engineering.
- Manufacturing Capabilities: Precision Machining, Metal Fabrication, Stamping, Powder Coating, Tool & Die.
Curious to learn more about how Big Rocks Engineering can help your business thrive?
Download our linecard to explore our full range of services, expertise, and solutions designed to drive your success and innovation.
The Problem...
Engineering teams and manufacturers are stretched thin. Whether it’s limited in-house resources, supply chain disruptions, or production bottlenecks, companies struggle to keep up with demand while maintaining quality. Delays, rising costs, and overseas supplier issues make it harder than ever to deliver on time and at scale.
When critical projects stall due to capacity constraints or unreliable suppliers, it puts your reputation, deadlines, and bottom line at risk. Long lead times, inconsistent quality, and dependence on offshore manufacturing leave you vulnerable to unexpected setbacks.
The Solution...
At Big Rocks Engineering, we eliminate production bottlenecks with high-quality U.S. manufacturing by leveraging the strength of our five sister companies. Together, we’ve built an integrated manufacturing network that ensures seamless collaboration from design to production, reducing lead times and eliminating supply chain risks.
Our advanced capabilities—including CNC machining, metal fabrication, progressive stamping, and automated powder coating—provide on-time delivery, scalable solutions, and consistent quality so OEMs can stay ahead without the challenges of offshore production.
Our Services
Manufacturing Capabilities
We specialize in high-precision manufacturing, including 4-axis & 3+2 axis milling, 5-axis water jet cutting, progressive stamping, and automated powder coating. Our advanced in-house capabilities ensure OEMs receive consistent quality, scalability, and reduced lead times.
Engineering Services
We specialize in reverse engineering, CAD design, and new product development, delivering innovative, efficient solutions tailored to your product needs. With advanced technology and 20+ years of industry expertise, we ensure precision and reliability at every stage.
Top Industries We Specialize In
Big Rocks Engineering delivers high-precision manufacturing and design tailored to the demands of aerospace, heavy trucking, industrial equipment, and flow control devices.
Our CNC machining, metal fabrication, and automated powder coating ensure compliance, durability, and efficiency for mission-critical applications.
Aerospace
Industrial Equipment
Heavy Trucking
Flow Control Devices
Our Family of Manufacturers
Located in the heart of Missouri, we're here to effortlessly transform your next project into reality.
A high-quality precision machine shop situated in the St. Louis Metropolitan area that has been in business for over 25 years and focused on customer service.
Founded in 1973, Mack Hils Metal Fabrication is a full-service metal fabrication and precision machining firm serving a diversified and large domestic marketplace.
Looking for high-quality powder coating in Missouri? Our state-of-the-art facility has got you covered with our heavy-duty powder coating track system. Trust us to deliver a durable and flawless finish every time.
As an ISO 9001:2008 certified supplier, we aim to be your single source for Tool & Die, CNC Precision Machining, Wire EDM, Metal Stampings, and more, ensuring quality and timely delivery at competitive prices for any volume
Mack Products has provided the finest quality reproduction parts for antique pickups. All pieces are authentic reproductions, with Mack Products carefully matching all parts to the original material, gauge, form, and finish.
Frequently Asked Questions
About Big Rocks Engineering
What does Big Rocks Engineering do?
Big Rocks Engineering provides engineering and manufacturing services for original equipment manufacturers, including reverse engineering, new product development, CAD design, and complete technical documentation packages. Through the Big Rocks Manufacturing family of companies, we also deliver CNC machining, metal fabrication, stamping, tool and die, and powder coating — engineering and production under one relationship.
What industries do you serve?
We serve OEMs and their Tier 1 and Tier 2 suppliers across industries including heavy trucking, food processing equipment, industrial and capital equipment, agriculture, refrigeration, material handling, off-road equipment, aerospace and defense-related manufacturing. Our customers are typically purchasing, sourcing, supply chain, and engineering leaders who buy fabricated, machined, stamped, or coated components.
Engineering Services
Can you make a part if I don't have drawings or complete specifications?
Yes. Reverse engineering parts that have incomplete, outdated, or lost documentation is one of Big Rocks Engineering's core specialties. We measure and analyze the physical part, then create dimensioned CAD models, tolerance specifications, material requirements, and a complete manufacturing-ready technical package — so the part can be quoted, produced, and second-sourced with confidence.
What is reverse engineering in manufacturing?
Reverse engineering is the process of creating complete technical documentation — CAD models, drawings, tolerances, and material specs — from an existing physical part when the original engineering data is missing or incomplete. Manufacturers use it to recover lost prints, document legacy parts, prepare for supplier transitions, and turn tribal knowledge into transferable documentation.
What is fractional engineering?
Fractional engineering gives your company on-call access to an experienced engineering team without hiring full-time engineering staff. Big Rocks Engineering supports manufacturers with product development, CAD design, technical packages, and manufacturability reviews on an as-needed basis — a practical option for companies whose engineering needs are real but don't justify a full-time hire.
Can you create CAD models and technical drawings for existing parts?
Yes. We produce dimensioned CAD models, technical drawings, tolerance specifications and full technical data packages for both new designs and existing parts. Complete documentation lets you multi-source parts, satisfy customer and quality-system audit requirements, and protect production knowledge as experienced employees retire.
Manufacturing Capabilities
What metal fabrication services do you offer?
Our fabrication capabilities include laser cutting, turret punching, press brake forming and MIG and TIG welding. Facilities are ISO 9001:2015 certified, and we handle work ranging from prototypes to ongoing production for OEM customers.
What welding capabilities do you have?
We offer MIG, TIG, stick, resistance and spot welding for carbon steel, stainless steel, and aluminum, including robotic and cobot welding cells for consistent production work. Orbital welding is also available for applications requiring precise, repeatable welds.
Do you offer CNC machining?
Yes. Our CNC machining capabilities include 5-axis milling centers, multi-spindle CNC turning with sub-spindle and live tooling, wire EDM and waterjet cutting, supported by CMM inspection equipment. We machine metals and plastics, from prototype development through high-volume production.
Do you offer metal stamping?
Yes. We provide production metal stamping with presses up to 350 tons, progressive , deep draw capability and bed sizes up to 48" x 96". Our tool and die team designs, builds, and maintains progressive, transfer, draw, pierce, blank, form, and trim dies in-house.
Do you offer powder coating?
Yes. Total Powder Coat & Finish, part of the Big Rocks Manufacturing family, runs both a 20-foot batch booth for smaller runs and an automated chain-driven line with a quick color change booth for production volumes. The automated line accommodates parts up to 54 inches long within a 71 by 15 inch window, with a three-stage pre-wash for adhesion and finish quality.
Do you offer assembly, kitting, or warehousing?
Yes. We provide light assembly, kitting, inventory management and logistics support, with over 40,000 square feet of secure warehouse space. Many customers use blanket orders with stocked inventory and scheduled releases to protect their lead times.
Materials
Do you work with stainless steel?
Yes. We regularly fabricate, machine and weld 304 and 316 stainless steel, including food-grade applications for food processing and equipment manufacturers. Stainless work spans laser cutting, forming, TIG and MIG welding, and precision machining.
What materials can you work with?
We work with carbon and mild steel, stainless steel (304, 316), aluminum, abrasion-resistant plate and engineered plastics. If you have a specialty material requirement, send the print — our team will confirm capability during quoting.
Working With Us
How do I submit an RFQ or become an approved vendor?
Send your prints or RFQ package directly to Mike Hill at mhill@bigrocksengineering.com or call (314) 649-0610, and we'll return a competitive quote with pricing and lead time. We're happy to complete supplier onboarding paperwork, sign NDAs before reviewing proprietary designs, and provide our line card and capability information for your vendor files.
Do you sign NDAs?
Yes. We routinely sign non-disclosure agreements before reviewing prints, proprietary designs, or project details. Protecting our customers' intellectual property is standard practice across the Big Rocks Manufacturing family of companies.
Do you have minimum order quantities?
We quote everything from prototypes and low-volume runs to high-volume production and volume requirements vary by process and part. If you're unsure whether your quantities are a fit, send the print — we'd rather look at the job than turn away a good long-term customer over a first order.
Can you take on overflow work when our shop is at capacity?
Yes. Many of our customers outsource to us when their in-house capacity is maxed out, a machine is down, or a project deadline outpaces their schedule. Because fabrication, machining, stamping, and powder coating live under one roof relationship, we can absorb overflow without you managing multiple vendors.
Do you support blanket orders and stocking programs?
Yes. We support blanket purchase orders with scheduled releases and can stock finished parts in our secure warehouse space so product ships when you need it. This is a common arrangement for customers protecting themselves against lead time risk.
Quality, Certifications & Logistics
Are you ISO certified?
Yes. Big Rocks Manufacturing facilities are ISO 9001:2015 certified. Quality inspection equipment includes CMM precision measuring systems and optical comparators, and our tool and die, machining, and fabrication operations run documented quality processes.
Where are you located?
Big Rocks Engineering is headquartered in St. Louis, Missouri, with manufacturing facilities across the state: Mack Hils Metal Fabrication and Total Powder Coat & Finish in Moberly, CED Precision Machining in Bloomsdale, and Roberts Tool & Die in Chillicothe. Our central location puts us within a day's drive of most of the Midwest manufacturing corridor.
Do you deliver? We prefer to work with local suppliers.
Yes — we operate our own trucks and have established freight capabilities, so delivery to your dock is part of the service, not your problem to solve. Customers throughout the Midwest and beyond treat us as a reliable second source or backup supplier precisely because logistics are handled on our end.