This will probably be the shortest MEM build on record. There isn't much to the engine. I started with the sub base. I turned the outside of sub base to size and added some decorative grooves to the face.
Then I drilled a 4-40 clearance hole.
Next I used a round over mill as a form tool to round over the edges.
The stand off was made from a left over piece of brass. It was faced on both sides and drilled for a 4-40 clearance hole.
With that finished I started on the cylinder assembly.
First I drilled and reamed the bore using my four jaw chuck.
Then the part was flipped and turned round.
I then cut some decorative fins into the cylinder.
Next it was over to the mill where I drilled the hole for the bearing and the mounting hole.
The waste was then milled out.
Next it was fileing button time to round over the frame.
That leaves us with this.
The flywheel was next. I cleaned up a scrap of steel bar into a flywheel blank and center drilled it.
Then the blank was put on the rotary table and centered up under the spindle.
Next the decorative holes were drilled.
The following piece was the shaft. One end was turned to a press fit into the flywheel and the other end was turned to fit the bearing.
Then the bearing end was drilled and threaded.
Next the crank disk was turned to size and center drilled.
Then it was over to the mill where the hole for the crank pin was drilled.
After parting off, the crank pin was pressed in
Then it was time for the piston. The profile was turned.
Then it was taken over to the mill and the end was drilled. And parted off. Notice my improvised machinist's jack. I really need to get some real ones.
The last piece was the base. I started with an off cut of corian that I drilled a hole in.
Then it was turned round. In hindsight I should have clipped the corners because those interrupted cuts sucked.
Then I used a ball mill as a form tool to profile the edge.
That leaves us with this family shot.
This weekend's task is to solder the bearing tube to the frame and blue the steel parts. Then I need to find a 4-40 screw long enough to mount the base. Hopefully it will run.
Till next time
Tony
Sent from my iPad using Tapatalk