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Summary Project Overview: I am developing a new commercial-grade rotational resistance fitness machine (COREX concept) designed for athletic performance, core training, and rehabilitation. This is not a simple CAD drawing project—I am looking for a mechanical engineer who can help bring this concept to life from early-stage design through manufacturing-ready outputs. Scope of Work: Develop a 3D CAD model of the product (Fusion 360, SolidWorks, or similar) Engineer the rotational resistance system (smooth, controlled, adjustable resistance) Design for durability, safety, and commercial use Create adjustable components for different user heights Optimize for cost-efficient manufacturing (COGS awareness) Provide: 3D assembly files Exploded views 2D engineering drawings Bill of Materials (BOM) STEP files for manufacturing About the Product Concept: The system is a standing rotational training device that allows users to generate controlled torque through the torso while maintaining lower-body stability. Key features include: Circular or ring-based rotational path Adjustable resistance (magnetic or mechanical preferred) Smooth, consistent motion (no jerky movement) Commercial-grade durability Compact footprint Sleek, modern design (inspired by high-end fitness equipment) Ideal Candidate: Mechanical engineer (not just CAD designer) Experience with: Fitness equipment OR Rotational/mechanical systems OR Resistance mechanisms Strong understanding of real-world manufacturing Ability to recommend materials and improve design Experience designing for prototype → production Project Phases: This project will be completed in phases: Phase 1: Concept CAD + movement validation Phase 2: Refined design + adjustments Phase 3: Manufacturing-ready drawings + BOM Important Notes: NDA required before sharing full concept details I will provide reference images, sketches, and a detailed spec sheet Looking for someone who can collaborate and improve the design—not just execute To Apply: Please include: Examples of similar mechanical or product design work What CAD software you use Any experience with resistance systems or fitness equipment Brief thoughts on how you would approach this project
Project ID: 40400100
11 proposals
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Active 15 days ago
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11 freelancers are bidding on average $38 USD for this job

I will develop a comprehensive mechanical design for the COREX fitness machine, focusing on structural integrity and smooth ergonomic resistance mechanisms. I am ready to provide detailed CAD assemblies and stress analysis reports to ensure the equipment is safe, durable, and ready for mass production.
$110 USD in 1 day
5.4
5.4

Hi, there I hope you’re doing well. I’m a Mechanical Engineer with strong experience in SolidWorks, Fusion360, Inventor, product design, 3D modeling, Printing, and manufacturing drawings. I’ve completed many projects as following: • 3D modeling and mechanical design with functions • Detailed engineering drawings and GD&T • Product development from sketches or new concept idea • 3D printing(STL) and Design for manufacturing (STEP) • High qualitied Rendering I can deliver accurate results and fast revisions, and I always maintain clear communication and reliability. I’d be happy to discuss your project details and start immediately. Looking forward to working with you. Best regards
$30 USD in 3 days
5.1
5.1

Hi, I'm Juli, a 3D design specialist. I've read your job description and I’m confident I can help. I have solid experience with SolidWorks, Fusion 360, and rendering tools like KeyShot. I focus on precision, fast delivery, and clear communication. I understand the requirements of COREX Fitness Machine and how to approach it effectively. You can also see similar work on my portofolio. Looking forward to hearing from you. Best regards, Juli
$85 USD in 1 day
4.6
4.6

Hello, I hope this message finds you well. My name is Rade, and I am a mechanical engineer based in Belgrade, Serbia, with over nine years of experience in the field. I have completed many projects throughout my career, primarily utilizing SolidWorks software. My portfolio showcases several projects across various sectors, including the military, food, and pharmaceutical industries. Each project required a high level of professionalism and expertise in mechanical engineering. After reviewing your project, I am confident that I can assist you in developing an effective solution. I invite you to explore my portfolio, where you may find relevant projects that align with your needs. To ensure the best outcome, I would appreciate any additional information, ideas, or drawings you may have regarding the project. This will help me gain a deeper understanding of your specific goals. I look forward to collaborating on this project and future endeavors. Best regards, Rade
$20 USD in 7 days
4.1
4.1

Hi, Could you provide more details on the specific resistance mechanism you envision for the COREX concept? I believe the key to achieving smooth, controlled motion lies in the right engineering choices. With over 7 years of experience as a mechanical engineer, I specialize in designing fitness equipment and rotational systems. I’m well-versed in SolidWorks and Fusion 360, and I can create a comprehensive 3D CAD model along with engineering drawings, assembly files, and a Bill of Materials. I focus on durability and safety, ensuring that the design is optimized for both performance and cost-effective manufacturing. I’m excited to collaborate on refining the concept and leveraging my expertise to enhance its design further. Let me know if you’d like to discuss this project in more detail! Best, Engr. Sahad
$30 USD in 2 days
4.1
4.1

Having studied your project requirements for a mechanical engineer to help with making the COREX Fitness Machine, I am confident that my skills and expertise make me the best fit for it. With more than five years of experience in 3D modeling, detailed engineering drawings, and much more, I demonstrate a strong understanding of the mechanical workings that your fitness machine requires. What sets me apart from other candidates is my ability to think beyond just executing on drawing tasks. combining creativity and practicality to provide clients with the most effective and cost-efficient designs for manufacturing. On top of this, I have some experience working on Health and Fitness related products which gives me further ammunition to contribute effectively to the project. I understand that my role will begin from Conceptual CAD development to Manufacture ready drawings through various phases and I assure you that my keen eye for detail in 3D assembly files or 2D engineering drawings coupled with my commitment to schedules would make sure each phase of the project is done effectively and successfully. Lastly, I truly value open communication, thus rest assured you will enjoy constant updates on all phases of the project from me. Thank you for considering my bid.
$20 USD in 1 day
1.1
1.1

Hello, This project aligns well with my background as a mechanical engineer working on complex, load-bearing products—not just CAD models. I’ve worked on rotational and resistance-based systems before, and a recurring problem I’ve seen is concepts that feel smooth in theory but develop backlash, uneven resistance, or premature wear once built. I address this early by validating motion paths, torque curves, and bearing/resistance selection during concept CAD, not after prototyping. I work primarily in SolidWorks and focus on designs that are safe, durable, and realistic to manufacture. I’m comfortable collaborating through phased development, refining the mechanism, and delivering production-ready drawings, BOMs, and STEP files with COGS in mind.
$10 USD in 1 day
0.0
0.0

Proposal: Mechanical Engineering for COREX Fitness Overview I am a Mechanical Engineer specializing in complex moving assemblies and resistance mechanisms. I don't just draw in CAD; I engineer for performance, safety, and manufacturing efficiency. My Approach Mechanism Design: I will evaluate magnetic vs. mechanical friction systems to ensure the "no-jerk" rotational path required for the COREX concept. DFM Focus: Every part will be designed for cost-efficient production (COGS aware) using materials rated for commercial-grade durability. Validation: Using [SolidWorks/Fusion 360], I will provide full motion study validation before moving to 2D production drawings and BOMs. Why Me? Expertise in rotational mechanical systems and human-centric product design. Proven track record of taking prototypes to manufacturing-ready STEP/BOM outputs. Ready to sign an NDA immediately to review your sketches and start Phase 1. Let’s connect to discuss the specific torque requirements for the rotational path.
$40 USD in 7 days
0.0
0.0

I’m a strong candidate because I have 12+ years of hands-on experience in product design and development, delivering projects from concept to production. I focus on practical, cost-effective solutions, use proven tools like FMEA and value engineering, and ensure clear communication and on-time delivery.
$20 USD in 7 days
0.0
0.0

As a seasoned Mechanical Engineer with expertise in SolidWorks and ANSYS, I believe I have the comprehensive skill set needed to bring your COREX Fitness Machine project to fruition. Moreover, my years of experience entail working with resistance systems and fitness equipment design; a unique background that could be instrumental in delivering on the specific requirements of your project. From ATV and Agriculture Machines Design to Fluid Dynamics and Manufacturing processes, my range of expertise has constantly equipped me with the ability सोह to innovate and improve both design and materials choices—focusing on reducing COGS while maintaining durability. My proposed approach would be an iterative process focused on delivering paramount fitness functionality with a sleek, contemporary aesthetic in line with your reference images. Each design iteration would be validated with movement modeling for consistent motion optimization. My extensive knowledge in real-world manufacturing also assures you cost-efficient designs that can be rolled out smoothly en masse. With me at the helm of this project, guarantee us an efficient, collaborative journey that would exceed your expectations
$25 USD in 4 days
0.0
0.0

Vestavia Hills, United States
Member since Apr 26, 2026
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