When launching a custom eyewear brand or introducing a new signature frame collection, the journey from an initial design concept to the final, retail-ready product can feel like a black box. For designers, prototype customizers, and brand owners, the two most critical success factors are precision (making sure the glasses fit and look exactly as intended) and efficiency (getting to market before trends shift).
At Hermitin, we believe in complete transparency. To help you plan your next launch, we are breaking down our step-by-step custom OEM/ODM eyewear manufacturing workflow and explaining the exact timeline involved: 7 days for design, 15 days for prototyping, 25 days for mold-making, and 45 days for mass production.
Phase 1: CAD & Technical Drafting (Timeline: ~7 Days)
The process begins with your design assets. Whether you provide a hand-drawn sketch, a 2D vector graphic (such as an Adobe Illustrator file), or a 3D rendering, our engineering team must translate it into a high-precision 3D CAD (Computer-Aided Design) technical drawing.
What Happens in This Stage:
- Fit & Geometry Calibration: We adjust the frame’s ergonomics, including the bridge width, temple length, pantoscopic tilt (lens angle), and temple bend to ensure comfortable daily wear. We also calibrate the frame for specific market fits (such as Asian Fit vs. Western Fit).
- Component Engineering: We design the hinge recesses, screw placements, and lens bevel groove dimensions.
- Material Mapping: Defining the exact thicknesses of the acetate, metal wire diameters, or TR90 injection points.
Within one week, we deliver a detailed technical blueprint for your review and digital signature.
Phase 2: CNC Hand-Made Prototyping (Timeline: ~15 Days)
Before investing thousands of dollars in tooling and raw materials, we build a physical pre-production prototype (also known as a hand-made sample or hand-stencil).
What Happens in This Stage:
- Acetate / Metal Carving: For acetate frames, we use CNC milling machines to cut the front shape and temples directly from a raw acetate block, followed by manual filing and hand-polishing. For metal frames, we wire-cut and hand-weld the components.
- Hardware Insertion: We heat-insert the metal cores and hinge joints to check their alignment and durability.
- Fit Testing: The sample is worn and inspected for balance, weight distribution, and aesthetic appeal.
This process takes about 15 days. Once the physical prototype is ready, we ship it to your team. Having a physical sample allows you to test the actual wear comfort, verify the colors in real-world lighting, and make any structural modifications.
Phase 3: Tooling & Mold Development (Timeline: ~25 Days)
Once you inspect and sign off on the physical prototype, we proceed to tooling and mold development. This stage is mandatory for injection-molded frames (TR90, PC) and metal stampings, and it is also used for proprietary custom parts (like custom temple-tip logos or unique hinge mounts).
What Happens in This Stage:
- Steel Mold Machining: We construct heavy-duty steel molds using high-precision EDM (Electrical Discharge Machining) and CNC steel-milling.
- Trial Injection Runs (T1 Samples): We run test pressings of the molds to verify that the melted plastics or metals fill the cavities perfectly, ensuring no air bubbles or structural weak points.
- Finishing Tooling: We polish the interior of the mold cavities to guarantee a flawless, smooth surface finish on the molded frames.
Building high-quality, durable steel molds that can withstand tens of thousands of presses requires precision heat treatment and metalwork, which takes 25 days.
Phase 4: Bulk Mass Production & Quality Control (Timeline: ~45 Days)
With the molds tested and raw materials sourced, we enter the mass production phase. Whether you are running a batch of custom acetate sunglasses or high-volume TR90 prescription frames, this is where the factory floor comes alive.
What Happens in This Stage:
- Raw Material Prep & Milling: Curing acetate sheets, mixing TR90 granules, or prepping titanium wires.
- Tumbling & Polishing (For Acetate): Acetate frames undergo a 72-hour drum tumbling process using wood chips and polishing pastes to achieve a mirror-like shine.
- Surface Plating (For Metal): Metal components receive vacuum IP (Ion Plating) or electroplating for corrosion resistance.
- Assembly & Lens Insertion: Custom hinges are riveted or heat-fused, and lenses (CR-39, Nylon, or Polycarbonate) are cut and fitted into the frame grooves.
- Rigorous Quality Assurance (QA): Every single pair of glasses undergoes alignment checks, drop-ball tests, and optical quality inspections before packaging.
Mass production and packaging take 45 days to complete, ensuring every piece matches the quality of the approved sample.
Summary of Custom Eyewear Development Timelines
| Stage | Duration | Key Focus / Deliverable | Why It Matters |
|---|---|---|---|
| 1. CAD Drafting | 7 Days | Precision 3D CAD Blueprint | Ensures correct ergonomics and hinge placement. |
| 2. Prototyping | 15 Days | Physical Hand-made Sample | Allows real-world fit testing and aesthetic sign-off. |
| 3. Mold-Making | 25 Days | Steel Injection & Bending Molds | Prepares tooling for high-speed, uniform bulk production. |
| 4. Mass Production | 45 Days | Finished, Packaged Eyewear | Milling, polishing, assembly, and final QC checking. |
Note: Timelines can vary slightly depending on design complexity, material availability (e.g., custom Mazzucchelli acetate sheets require extra curing time), and seasonal factory capacity.
Partner with Hermitin for Efficient Custom Eyewear OEM
Navigating the prototyping and manufacturing phases requires a factory partner that balances speed with strict craftsmanship. At Hermitin, we combine advanced CAD engineering, modern CNC machining, and decades of hand-polishing expertise to deliver samples and mass production runs on schedule.
Are you ready to bring your eyewear sketch to life?
👉 Contact our OEM Customization Team on WhatsApp to discuss your concept drawings or request a prototyping quote!