Ok let's finish this build out. Time to build the crank. I started by milling one side flat.
Then it was flipped around and placed against my chuck stop and the other face cleaned up.
Then it was flipped again and and held by the boss. The face was trued up and the center drilled and reamed.
Next up was some mill work. The spindle was centered on the boss and the hole for the crank pin was drilled and tapped.
The part was finished by drilling and tapping a hole for the set screw.
Next up is the flywheel. I mounted it in the three jaw and cleaned up one face.
Then I flipped it and cleaned up the other side. I also drilled and reamed the center hole.
Next I did an initial cleanup on the outer rim.
Over to the mill while I drilled and tapped the set screw hole.
Then I mounted the flywheel onto the shaft and did a final true up.
Next up is the connecting rod. I spot faced both sides of the bosses.
Then the required holes were drilled.
The eccentric sheath was next. It was placed in the collet chuck and bored out.
Then the mounting hole was spot faced, drilled and tapped.
Now for the last part, the eccentric it self. I setup the four jaw and turned the offset.
Then the center was drilled and reamed.
The four jaw was recentered and the groove was cut.
Then the eccentric was parted off and the set screw hole drilled and tapped.
That completes the machining on the the engine (or so I thought). I tried to assemble it and I couldn't get the crosshead in. It turns out that I had misread the plans and hadn't widened out the crosshead area enough on the base casting. I took care of that it want together ok. After getting everything adjusted I applied the air and it took right off. It was running on 15 psi with no gaskets or rings. Here is a picture after the first run.
Now I have to tear it down and paint it. The next posting will be in the showcase.
Tony
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