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large vacuum engine

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Michael S.:
Hello,

I started building a vacuum engine. There is a construction plan and the motor has a bore of 50mm and a stroke of 90mm. I've never built an engine like this before.
I discovered on the Internet that there is a dealer in Luxembourg, rc -machines, that offers a few castings that fit the engine well. They aren't that expensive either.
I bought the flywheels at an exhibition. One of them is already painted red and the other is still rusty. But already edited. As a cylinder I use a pipe from the plumbing store. In 2 inches.

I'll start with the crankshaft bearings.
All castings have already been partially milled by the dealer. The cast iron is easy to work with.
The bearings are split and I would like to use these finished bronze bearing bushes.
Oilers with lids are placed on top of the bearings. I think that fits quite well.

The crankshaft has a diameter of 14 mm and is adapted to the bore of the flywheels (12 mm).

The beginning has been made

Michael

bent:
That is a nice looking set of castings.  And an interesting (to me) pipe nipple - it looks as if it has been continuously cast in a bronze alloy before having the threads machined?  My wife did some research and modelling of continuous castings for the Olin Corporation before upping her game and becoming a stay-home mom.  Looks like a fun project, Michael!  :popcorn:

Michael S.:
The crankshaft is made of 14 mm silver steel.
For the crank webs, I glued two pieces of steel together with Loctite and machined them together on the milling machine.
For safety, the shaft is also secured with small pins.
Since the crank has a large stroke, I thought it would be positive to install counterweights there for smooth running.
I'm quite happy with the result.

Greetings Michael

Michael S.:
Hello Bent,

yes, the pipe nipple is made of bronze/gunmetal.
Inside it's pretty well rounded. But has an inner diameter of about 50.50 mm.
After processing it will definitely be 51 to 52 mm.
The challenge is clamping on the lathe. I have similar problems to Chris with his cylinders.

Greetings Michael

Roger B:
Looks to be a fun project  :ThumbsUp: RC sometimes has some interesting castings  :)

I find my Keats angle plate good for holding slightly strange shapes.

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