Written by Jonathan DeWolf, Mechanical Engineer II
Once the brainstorming in the early phase of a project concludes, the race begins to show a prototype of the next cutting-edge medical device. A variety of techniques can be used to quickly turn a brainstormed concept into a tangible 3D design. Through the capabilities at Sunrise Labs and a network of preferred vendors, the necessary parts are in the hands of engineers in a timely fashion; in some instances, overnight!
There are several benefits associated with prototyping early in the design process. Included in these benefits are experiencing the ergonomics of a device, ensuring the assembly process is accurate and confirming the fit of the necessary components. The aforementioned purposes reduce technical and schedule risks. Before agreement on the fabrication of parts, quick-turn prototype parts are invaluable in converging on the finer details.
Sunrise Labs is constantly investing in and expanding its in-house prototyping capabilities, including 3D printing, machining, laser cutting, finishing/ bonding and silicone molding. Internal to Sunrise, we have all the leading the 3D printing systems, including both fused deposition modeling (FDM) and stereolithography (SLA); each with its’ own benefit:
- Stereolithography is a laser curing, resin 3D printer, capable of fine resolution and tight tolerancing. This is especially useful for construction of molds to be used in small volume including prototype silicone molding.
- Fused deposition modeling uses a filament and a heated extruder to dispense the filament at a prescribed location. The FDM printing method carries a coarse resolution in comparison to the SLA printers, but reduces print time. This method is commonly used for shape models, bracketry, and adapter parts.
- HP Multi Jet Fusion (through an outside partnership) is a nylon printing method synthesizes parts that possess hybrid characteristics of both the SLA and FDM methods. The resulting product from this process is a strong and durable output with moderate resolution. This is commonly selected to mimic injection molded enclosures or machined parts with long lead times.
Machining capabilities at Sunrise include a computer numerically controlled (CNC) milling center with 4th axis attachment controlled directly from the CAD database and a lathe. For plastics, the laser cutting machine functions from any 2-dimensional file directly controlled from the part CAD file. Using the SLA printer at Sunrise, engineers quickly deliver molded silicone parts.
Through a network of ever-growing local vendors, Sunrise has expanded prototype capabilities even further. Sunrise has several local ISO certified vendors that will deliver accurate parts, on time and to specification. Close proximity to Sunrise allows face to face communication between the machinist and the engineers. This decreases any ambiguity and leads to feedback on the parts for future improvements linked to design for manufacturability.
Here are examples of an effective implementation of prototyping to enhance the design process:
- After the feasibility of a design was completed, a rigid shape model of the internal mechanisms of the device were printed. This was completed to aid in the Industrial Design of the enclosure and get an understanding of the scale of the mechanism.
- Prior to the procurement of the next phase of a project, all parts within the mechanism were individually 3D printed. This led to the opportunity to perform a “mock” build. The mechanism was able to mimic the machined version and confirmed the assembly process was completed in the correct sequence.
- Prior to the release of injection molded designs, the plastic enclosures were 3D printed (HP Multijet Fusion) using an outside vendor. Upon receiving the printed parts, the full devices were built, fully functional and were sent out to various conferences and trade shows throughout the country.
about our Engineering Capabilities.