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Elmer’s “Scotty” # 8

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Blacksheep

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New year new project.
I started to build the Elmer’s Verburg #8 scotty.
It’s very similar to the other two engines that I’ve built but this time I will approach the project in a different way due to some little issues I had in the other projects.
This time I started from the wooden display because it’s harder for me to carve a precise sized circle in wood than machine a metal round base that fit well in place.
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Once the wooden display was done I let my bandsaw cutting the base disk while I squared the frame.
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Then I machined the base on the lathe.
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It fits good in his place.
Even if that’s not critical it’s more beautiful without gap between the circle carved in the wood and the metal base.
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That’s all for today.
 

Blacksheep

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Today I worked on the frame to get the final shape and squared the cylinder.

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I machined the brass bolts to adapt them to the shape I need.
Here you can see the difference.

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I don’t have an edge finder and in the previous project I got the right spacing between the holes but they were displaced by a couple of tenths to the bottom so I decided to hold the frame and the cylinder coupled in the vise.
Doing that way I drilled the four holes exactly in the right position on all two parts.

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I’ve also drilled and reamed the cylinder bore, next I will lap it and will chamfer the edges.

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Blacksheep

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I went back to the workshop today and I made some steps forward: once finished the frame and the cylinder I made the flywheel and the crankshaft from a bar stock of Ss.
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Blacksheep

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The build continues slowly but costantly.
I made a couple of new little pieces.
Since I had little time to spend in the workshop I decided to machine the simplest parts like the piston rod, the bracket and the tiny slide block.
I prepared also the blank piece of brass for the piston and I’ ve already lapped the cylinder.
Just 4 parts to go.
 

Blacksheep

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Wow Joahn, it looks really good, thanks for sharing.
Nice polishing work!

Mine it’s almost finished, I have just to machine the yoke.

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Here some pics of the piston and bushing being machined.

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Blacksheep

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After a few days of stop today I went back to work on the scotty and I finished all the parts of the engine.

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I connected it to the compressed air line and it runs. 👍🏻
Now it’s time to make a little polishing work and prepare it for the camera.
 

Blacksheep

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Here it is!

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It runs, Here is the video but I’ m not entusiasthic.
It doesn’t runs smoothly, there’s a little vibration at some point.
I think it’s caused by the crankshaft wobbling, when I press fitted the two pieces something went wrong and I ruined it.

Anyway it runs and I won’t work on it anymore but even if it’s been a fail I learned something from this project: If there’s not enough time to make a good part it’s better not to do it.
 

Blacksheep

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Thank you for the support and for the replies, and again thanks to all the people who whatched this build.
 

Blacksheep

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Thank you Dave, believe it or not, I already downloaded that plan a couple of days ago after watching the you tube video.
It’s really interesting but for the next project I’m uncertain between this twin cylinder and a beam engine.
 

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