Prototyping Services Information

Prototyping services provide low-volume conceptual or working models of a design. These designers create prototypes or models to engineers to explore design alternatives and test product performance prior to production.
Selecting prototyping services requires the developer to match their prototyping needs, including purpose and type, with the provisions of the service provider. Often, suppliers of high-volume part services will also provide prototype services for those products.
Purpose of Prototypes
Prototypes are designed for a number of purposes based on the needs of the engineer or developer.
Proof-of-principle, also known as proof-of-concept, prototypes are used solely to test certain aspects of an intended design without attempting to match all the conditions and properties of its use. These models are used to prove the feasibility of a potential design approach or process.
Form studyprototypes are used to represent the physical form, shape, and size of a design. These models do not attempt to match a design's functionality or the specific details of its appearance.
Visual prototypes are used to capture a design's aesthetic qualities and appearance, including color and texture. These models do not attempt to match a design's functionality.
Functional prototypes are used to simulate the final form of a design, encompassing to the extent possible its full functionality, form, and appearance. They are used as the final test of concept and as a final check for design flaws before being produced on a larger scale. These models may be reduced in size to reduce the costs.
Types of Prototyping Services
Prototyping services may create prototypes for a variety of different types of products.
Software prototypes are prototypes used to test various stages of computer software. Stages of prototypes for software development are described in the table below:
|
Type of Prototype |
Typical Purpose |
General Characteristics |
When to Use |
|
Concept Prototype |
Analyze system approaches |
High-level, overall vision |
Concept Definition Stage |
|
Feasibility Prototype |
Determine feasibility of various solutions |
Proof of concept for specific issues |
Concept Definition Stage |
|
Horizontal Prototype |
Clarify scope and requirements |
Demonstrates outer layer of human interface only, such as windows, menus, and screens |
Function Definition Stage |
|
Vertical Prototype |
Refine database design, test key components early |
Demonstrates a working, though incomplete, system for key functions |
Later portion of Function Definition Stage |
|
Functional Storyboarding |
Determine useable sequences for presenting information |
Demonstrates the typical order in which information is presented |
Function Definition Stage |
Table Credit: Craig Borysowich - Toolbox.com
Hardware prototype are prototypes used in the development of computer hardware.
Part prototypes include models for any type of individual product or for components of a larger system or piece of equipment.
Equipment prototypes include design models for machinery and industrial equipment.
Rapid Prototyping
Rapid prototyping is the fabrication of prototype models using CAD or other design software programs to provide the part data. These services can produce prototypes for designs with complex geometries in a relatively short amount of time. The table below describes the properties of some different rapid prototyping technologies:
| Technology | Acronym | Representative Vendor | Maximum Part Size (inches) | Speed | Accuracy | Surface Finish | Strengths | Weaknesses | System Price | Plastic cost ($/lb) | Metal cost ($/lb) | Other material cost ($/lb) |
| Stereo-lithorgaphy | SLA | Sony | 39 x 31 x 20 | very good | very good | very good |
large part size, accuracy, speed |
post processing, messy liquids |
$219-800K | $75-110 | ||
| Stereo-lithography | SLA | 3D Systems | 20 x 20 x 24 | average | very good | very good | large part size, accuracy |
post processing, messy liquids |
$75-800K | $75-110 | ||
| Wide Area Thermal Inkjet | MJM | 10 x 8 x 8 | good | good | fair | office OK |
size and weight, fragile parts, limited materials, part size |
$50K | $100 | |||
| Selective Laser Sintering | SLS | 15 x 13 x 18 | average-fair | good | fair | accuracy, materials |
size and weight, system price, surface finish |
$300K | $30-60 | $25-30 | 5 (foundry sand) | |
| Fused Deposition Modeling | FDM | Stratasys | 24 x 20 x 24 | poor | fair | fair | office OK, price, materials | speed | $25-300K | $115-185 | ||
| Single Jet Inkjet | MM | Solidscape | 12 x 6 x 9 | poor | excellent | excellent |
accuracy, finish, office OK |
speed limited materials, part size |
$70-80K | $100 | ||
| Three Dimensional Printing | 3DP | Z Corp. | 20 x 24 x 16 | excellent | fair | fair |
speed, office OK, price, color |
limited materials, fragiel parts, finish |
$30-70K |
$0.35/in2 (starch); $0.60/in2 (plaster) + infiltrant |
||
| Laminated Object Manufacturing | LOM | Cubic Technologies | 32 x 22 x 20 | good | fair | fair to poor |
large part size, good for large castings |
part stability, smoke, finish and accuracy |
$120-240K | $9 | $5-8 (paper) |
Table Credit: Castle Island Co., Ferris State University
References
Ferris University - Rapid Prototyping
Image credit:
Aztalan Engineering, Inc.
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