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DESIGN OF MINIATURE TURBOJET ENGINE 49 time, machining cost, and labor. However, after we completed the turbine and attached it to our shaft, we realized that the turbine was slightly asymmetrical. We determined the most likely cause of asymmetry in the turbine to be a failure in properly fixturing the component during CNC operations, resulting in the stock piece being not perfectly centered in the lathe chuck. As a result, the turbine blades on one side of the disk were machined approximately 20/1000 in shorter than those on the other side. Due to the difference in the length of the blades, we were forced to either re-machine the rotor or remove 20/1000 in from the overall diameter. We determined that we did not have enough time to machine a second turbine and decided to repair the original. The resulting turbine, prior to balancing, produced substantially less vibration when spun with compressed. However, the alterations to the blade length resulted in a gap between the turbine and the stator housing of 30/1000 in. The specified tolerance between these two parts was 10/1000 in in order to achieve minimal gap losses and maximize efficiency. Although the turbine will be adequate for operation it is not ideal and will suffer from unnecessary gap loss during operation. The completed turbine wheel attached to the shaft can be seen in Figure 16.PDF Image | Design and Manufacturing of a Miniature Turbojet Engine
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