Thanks everyone, I think it’s time to close this one out. The next part made was the flywheel. Yet again I had a cast iron part that belongs on an artillery shell instead of an engine. This time I was at least able to get a usable part out of it. I started by trying to file off the flashing to get the casting semi presentable. The flashing was so hard I had to use a rasp to do the filing. My regular machine files were skating right over it. The good news is that other then some flashing on the spokes, the rest of the casting was in very good shape. The next thing I did was to clean up one side of the hub using a bump center to get it running as true as possible.
Then the part was flipped and the other center cleaned up and drilled.
Next I loctited the flywheel onto a mandrill for turning between centers. After the Loctite cured, I tried to face the front of the rim with no luck. I ended up breaking an insert trying. The same thing happened with the other face. Thankfully they weren’t to bad so I just touched them up with my rasp. With those done I was able to break through the hardened outer layer on the outer circumference and get that to dimension. When you look at the picture you can see how thick the shiny (hard) areas are on the faces.
With that done, I heated up the mandrill and removed it from the flywheel. The last thing to do on the flywheel was to drill and tap the hub for a setscrew.
Needless to say I’ll be painting this flywheel. With that done I made the valve and piston nuts. They were both made the same way so I’ll only show one. First the outer diameter was turned for threading.
Then the thread was cut and the center drilled.
The nuts were parted off and cleaned up. The last part to make was the crank pin. The instructions call for you to make a slotted steel screw but since I’m not a fan of slotted screws and I have already fabricated a bunch of other things in this engine I decided to change it up. I had a scrap of the 5 BA hex stock that the piston nut was made from. I turned it to shape, threaded the end and parted it off.
With that done I grabbed a scrap of Corian and made a base. With the exception of the connecting rod (which still needs rounding over) that completes the metal work on this project. It’s time to pull it all apart and paint it. Here is a final family shot.
Till next time
Tony
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