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DESIGN OF MINIATURE TURBOJET ENGINE 51 We chose to manufacture the outer housing from a six-inch outer diameter length of 304 stainless steel tubing. The primary challenge during manufacturing was properly holding the tube on a lathe in order to machine the outer and inner diameters. Due to the size and length of the tube, we decided to use a four-jaw chuck to hold it from the inside. We encountered a large amount of deflection and chatter while turning down the outer diameter. To solve this problem, we welded a piece of steel across the inside diameter of one end of the tubing. We then center drilled the piece of steel and utilized a tailstock and live center to reduce deflection and ensure a uniform surface finish. Following the turning operation on the outer diameter, we flipped the tube and bored the inside to the exact outer radius of the diffuser fins. Once the tube diameters were properly sized, we drilled eight holes around the circumference of the diffuser end and welded an annular endcap to the turbine side. The primary feature of the annular endcap is to allow for the attachment of the nozzle. The outer housing can be seen in Figure 17. Figure 17: Outer CasingPDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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