I have nothing to say for my protection. I've gone totally off the deep end. I've always wanted a jet
engine (from the moment I found out that these things exist) but building one?!?!? Yup, send for the
people with the white coats...
Seriously, I've always been interested in mechanical things and this promises
to be a lot if fun.
The engine is a Wren MW54 turbojet engine. It's based on a stock Garrett
compressor and a custome made turbine.
Just finishing the shaft tunnel here...
One side is in the chuck and the other is being supported by one of the backup bearings.
I bought these back-up (read: cheap) 688 bearings so that I wouldn't have to risk damaging my GRW ceramic
bearings while trying to fit them to the engine.
What I didn't show is the boring of the center and cutting the o-ring groves (we made a special HSS tool for that).
Drilling the first of the 6 holes in the Shaft Tunnel with a 2.6mm drill. The tunnel is held in a vise that's padded with aluminum
to protect it (the tunnel that is).
Nope, I'm not drilling the diffuser here. All I'm doing is marking the shaft tunnel for the other 5 holes with a 3.5mm bit.
Notice that the first screw is already in place (just to hold the diffuser in place).
Here I'm drilling the other 5 holes in the Shaft Tunnel. I thought I took pictures of the tapping
process but somehow the camera insists that it doesn't have them. Not that they were interesting since all tapping
operations are the same: drill, lubricate, turn the tap, pray that it doesn't break and ruin the part.
Murphy's law of tapping: The chance of breaking the tap is inversely proportional to the price of the part and
the amount of work you have already put into it. Mercifully I haven't broken one yet. I shouldn't talk,
I've got a lot more taps to go.
Start of the Shaft Seal. Yes, I know it's a round part. Here I'm turning down a sheet of aluminum
In order to create a round part.
Here Jeff is milling the lubrication tunnel. This tunnel carries air and the fuel-oil mix to the front bearing.