Machining and Printing Parts
Some customized parts need to be fabricated in order to make a pump. The design requires three techniques of lab-level fabrication, CNC machining, 3D printing and wire Electrical Discharge Machining (EDM).
CNC Machining
The team used CNC milling for engineering plastic and aluminum parts. For aluminum parts, the team used an online fabrication service (ProtoLabs FirstCut).POM
POM is an engineering plastic used in a wide range of industries. Machining this material is very easy and the material has enough strength. The team used a CNC milling machine to make some parts.
POM plates | 
CNC milling machine we used (Mimaki NC-5) |
In the design of the pump, CNC machining was used to make following two parts .(Download CAD data)
| Oil Seal CasingPOM plate (Thickness: 7mm) |
| Motor MountingPOM plate (Thickness: 15mm) Install five M2.5 insert screws (Ensat 302 000 025) on the side and two M3 insert screws (Ensat 302 000 030) on the bottom 
|
Aluminum
The team used the fabrication service because machining power is required compared to POM parts. (Download CAD data)
| Rotor CasingAluminum A5052 Finish: sand blast |
3D printing
We used an online fabrication service (DMM.com). Since 3D printed nylon parts are very strong and durable, we choose this material. 3D printing enables to make complex shape parts perfectly. Designs can be changed to fit the purpose. (Download CAD data)
| Outlet CasingNylon 3D print The surface is colored with black dye. |
Wire EDM
We used wire EDM for high precision machining of stainless steel and slide plates because wire EDM can cut the metal even if it is really hard. (Download CAD data) | 
Wire EDM we used (Makino SP43) |
Stainless steel
Stainless steel is suitable as a material of rotors. However, stainless steel is a difficult material for CNC machining. Precise machining is also required for rotors. Wire EDM is one of the best choices for rotor machining.
| Out rotor and inner rotorStainless steel SUS303 plate (Thickness: 9.5mm) |
| Shim ringStainless steel plate (Thickness: 1mm) |
Oil-less Slide Plate (DAIDYNE DDK05)
To reduce the friction between rotors and casing, we set oil-less slide plates both sides of the rotors.
| Cover slide plateDAIDYNE DDK05 slide plate (Thickness: 2.5mm) |
| Bottom slide plateDAIDYNE DDK05 slide plate (Thickness: 2.5mm) |