I have been in love with furniture upcycled from old plane parts for a while now. I found this turbine wheel from an old airplane online and decided to buy it in order to build my own coffee table out of it. The top side of the turbine fan has a thread in it that was impossible to measure directly since no equipment was small enough to fit inside. In order to measure the thread used a piece of styrodur that I formed on turning lathe. I screwed the styrodur into the thread and measured the negative. It's an M30x1.5.
The turbine wheel is beautiful. The center is made from stainless steel and the fans are made from brass.
On the bottom of the wheel you can see that the wheel has been factory balanced by removal of small amounts of metal along the inside of the outer enclosing.
The project is not done yet. Currently only this CAD model exists in Fusion 360.