CMS Flight Injector

The injector is one of the most important parts on the entire rocket. Our injector was 3D printed out of 718 Inconel by an outside supplier, but the post-machining of the injector to bring it to proper dimensions was all done in-house in BIDC. I first drilled out the flange holes on a manual mill. I then created a fixture plate to align the injector in a vice. I post-machined the top, creating a smooth circular contour that could then be placed into custom-made soft jaws. The injector face needs to be very flat and smooth for proper sealing to the chamber, so a face mill with wiper inserts was used to get a perfect finish. Then, to ensure alignment, each injector element was individually probed and post-machined. A copper faceplate was then machined and press-fit over the injector elements. Each injector element was then flared to fasten the faceplate in place.