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machining the power turbine output shaft As it was noted on a previous page, dealing with the shaft is probably going to be one of the most difficult tasks in this project, but I think I can say that a solutions has been found.
Note the end of this shaft. Its not really a gear, and not really a spline. The side that plugs into the power turbine gear box will not be modified, however, something needs to be done with this other end. After speaking with several local machine shops, I thought it might be more cost effective to have them do it. I quickly found out that, its not.....by a long shot. So it was back to the drawing board to come up with an idea. I spoke with friend who gave some really good ideas. I applied those ideas to this shaft. The shaft was placed in a lathe, and all the teeth were turned down. From there a 1/2" recess was turned down to create a "male" end. A 1" OD solid bar stock was chosen to "extend" the shaft. A "female" end was created to match the male end. The two were pressed together and here is what the shaft looks like so far
Click for larger image
Click for larger image Some good progress. Currently the shaft has been "trued" to 3/1000 of an inch, which should be fine. A second check will be made and three strong welds will be made to complete the shaft. The bearing carrier has started the machining process. As soon as I get that done I will post up some more pictures.
Well if you are to this point, this is the start of the new update posted on the front page for 8-13-2007. Some new things have happened since your last visit. I am very happy that progress on the power turbine is coming right along. A few bits of delay, but nothing major.
Ah...the NGV, or nozzle guide vanes. Here is a shot of them. These little puppies are what "direct" the fast moving air coming from the gas producer in the power turbine section. Without these, the air would be unstable, and very turbulent making the power turbine very inefficient if not functional. This NVG is made from Inconel. This tolerates the heat very well, however, makes it very difficult to machine.
Finally got around to picking up the 5" adapter and V band clamp. This will make a connection point between the gas turbine and the power turbine section.
The above four pictures are "layered" to show how this will go together. The first two pictures show the NGV setting into the containment ring, the next two show how the adapter ring will eventually connect to the NGV. I am still thinking about how to get this all together, but that's for another day. On to the power turbine!
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News: Work has now started on project Jet Kart! Click HERE to go check it out!
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