As part of an integrated design process Optima can provide physical prototypes to validate both function and form. These are often crucial in a full product development cycle. The benefits of CAD driven rapid prototyping and testing techniques are numerous. Some of which include reduced development time, safer, leaner and more visually sophisticated final products; functional prototypes for testing; convincing appearance prototypes; and prototypes that can be used for promotional activity and marketing.
Optima have established relationships with several key suppliers in the UK and Far-East, ensuring the lowest cost and the most appropriate prototyping methods.
We can offer a wide range of processes including:
SLA (Stereolithography) prototyping is a 3D printing process that uses a laser to cure liquid resin, layer by layer to create a solid object. The laser traces patterns based on a 3D CAD design, hardening the resin where it focuses. After each layer is completed, the platform moves slightly to allow the next layer to be formed. This this process repeats until the whole object is resolved.
The models can subsequently be refined to achieve a high-precision, smooth surface finish, making them ideal for detailed prototypes and presentation models. A variety of resins are available, each designed to replicate the characteristics of common engineering plastics. This enables the creation and testing of prototypes that accurately simulate fit and function. The advantages of this process are numerous, including the assessment of assembly conditions, a reduction in time to final tooling, ergonomic evaluations, and pre-tooling testing and certification.
CNC (Computer Numerical Control) machining is a process in which a computer-controlled machine carves a part from a solid block of material, such as metal, plastic, or wood. The design is uploaded into the CNC machine, which then precisely follows the provided data to shape the part by removing material layer by layer using tools such as drills, mills, or lathes. While similar to traditional machining, CNC machining distinguishes itself by being digitally controlled with multi-axis capabilities, allowing for the creation of highly complex parts that would be difficult to produce using traditional techniques.
This method is great for creating robust, accurate prototypes, especially when the final parts need to be made from durable materials. It’s often used for low-volume production or when high precision is required, such as in mechanical or functional parts for testing. It is also commonly used to make master moulds for soft tooling and PU moulding.
DLP (Digital Light Processing) prototyping is a 3D printing method where a screen shines light onto a liquid resin, curing it layer by layer to create a solid object. A base screen displays an image of each layer, and the emitted light hardens resin in the areas it exposes. After each layer is cured, the build plate moves slightly to make room for the next layer. This process repeats until the object is fully resolved.
DLP is known for its speed and high precision, making it ideal for creating detailed prototypes with smooth surfaces. It’s commonly used for making models in industries like jewellery, dental, and product design engineering.
SLS (Selective Laser Sintering) is a 3D printing process that uses a laser to heat and fuse fine particles of powdered material, like Nylon, Polypropylene and Aluminium, layer by layer. The laser selectively melts the powder based on a supplied 3D CAD design, bonding the particles together. After each layer is completed, the platform drops slightly, and new powder is spread over the surface. This process continues until the object is fully built.
SLS is highly effective for producing strong, functional prototypes due to its use of materials that closely replicate those used in final products. The process does not require support structures, as the powder itself supports the object during printing, resulting in a quicker and more accurate development of functional parts.
Vacuum casting is a prototyping process in which a master model (typically a 3D-printed resin or CNC-machined form) is used to create a mould cavity. Initially, a silicone mould is formed around the master model. The mould is then placed in a vacuum chamber, where a two-part liquid resin is injected into the cavity, setting to form the part. The vacuum chamber helps eliminate any remaining air pockets and bubbles, ensuring the production of consistent parts. Once the material has set, the mould is removed, yielding a high-quality replica of the original model. The mould can be reused multiple times to produce additional identical parts.
This process is commonly employed for producing small batches of parts or prototypes with a smooth finish and exceptional detail. It is particularly useful for creating parts that closely resemble the look and feel of injection-moulded products. The resins used are specifically formulated to mimic common engineering plastics, including Acrylic, Glass-filled Nylon, Polycarbonate, and ABS.
Thermojet wax model prototyping is a process where a 3D printer creates a model using a wax-like material that can be melted away. First a 3D printer builds the object layer by layer. Once the model is complete, it can be used as a sacrificial master part in the casting processes, like lost-wax casting. The part is used to form a cavity, this is then filled with a hot liquid material such as steel or aluminium, which melts and displaces the wax master, leaving behind a part formed in the intended material.
This method is commonly used in industries like jewellery, aerospace, and automotive to create highly detailed, accurate prototypes or final parts that are required to be made in limited volumes.
RIM (Reaction Injection Moulding) prototyping is a process where two liquid materials are mixed and injected into a mould. These materials react with each other and chemically cure to form a solid part. The mould is usually made of metal or a durable material, and after the liquid mix is injected, it hardens into the final shape.
RIM is often used for making large, lightweight parts with complex shapes, and it works well with materials like polyurethanes. It’s commonly used for prototype parts in industries like automotive or consumer goods, where a functional part is needed quickly and without the cost of traditional injection moulding.
By employing one or more prototyping methods, a physical representation of the final product can be created prior to mass production. This process can serve various purposes, such as generating marketing materials, testing the product, or proving the concept, depending on the specific requirements.
Once the parts are fabricated, they are smoothed and refined as needed. Additionally, details such as textures, paints, and decals can be applied to enhance the model’s resemblance to the final product.
Ultimately, the goal is to transform a concept into a tangible object that closely mirrors the final product, enabling necessary improvements before full-scale production.
Prototype tooling refers to the creation of moulds or tools used to produce small batches of products during the prototyping phase. These tools are typically made from softer, less expensive materials (like aluminium, resin, or silicone) instead of harder materials like steel. The purpose is to create prototypes more economically, allowing designers to test and refine the product before committing to expensive mass production tooling.
Since the materials used for prototype tooling are easier to work with, the process is quicker and more cost-effective, making it ideal for small runs or testing. This approach is often used when a company needs to produce a limited number of parts to assess design, fit, and function without the high costs associated with traditional steel tooling used for mass production.
In short, prototype tooling uses softer, more affordable materials to create small quantities of products quickly and cost-effectively for testing and refinement before full-scale production.
A “rig” is a custom made tool or system designed to assist in the construction, testing, or simulation of a product’s functionality. It is commonly employed to ensure the correct operation of a product before mass production begins.
For instance, when designing a new car, a rig might be developed to test how the suspension system responds to various stresses or to evaluate the functionality of the doors. The rig would simulate real-world conditions, allowing engineers to make necessary adjustments based on the results of these tests.
In a manufacturing environment, a rig may serve as a custom setup for assembling product components in a controlled, repeatable manner. This ensures proper alignment and fit of each part, thereby facilitating a smooth and efficient manufacturing process.
In summary, rig building in product design and manufacturing involves the creation of specialized systems or devices to test, assemble, or simulate product components, ensuring that the final product functions as intended prior to full-scale production.
Please contact us to discuss your prototyping requirements and how the most appropriate rapid prototyping technology can be integrated into your product design regime.
Unit 20, Maisies Way, The Village, South Normanton, Derbyshire, DE55 2DS
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