Oliver Evans The Columbian Steam Engine

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marksavoca

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My build of 'The Columbian Steam Engine' designed by Oliver Evans in the early 1800's.

From Wikipedia:
Oliver Evans (September 13, 1755 – April 15, 1819) was an American inventor, engineer and businessman born in rural Delaware and later rooted commercially in Philadelphia. He was one of the first Americans building steam engines and an advocate of high pressure steam (vs. low pressure steam).


IMG_7367
by Mark Savoca, on Flickr


I based much of my research on this image:

Oliver_Evans_steam_engine
by Mark Savoca, on Flickr

From the above image and other research I built a 3D model in Fusion360:

The Columbian Steam Engine v606.1
by Mark Savoca, on Flickr

I started by building the wooden components:

IMG_E8411
by Mark Savoca, on Flickr

Then the cylinder. Because it is dual acting, I attached a tube to feed the top of the cylinder.

IMG_8513
by Mark Savoca, on Flickr


IMG_1471
by Mark Savoca, on Flickr

The valving was simply described as 'a rotary valve'. It took a couple of prototypes to get to what I imagine was inside the valve.

IMG_5235
by Mark Savoca, on Flickr

The valve body was one of the more complicated items I've machined
IMG_4927-2 by Mark Savoca, on Flickr


IMG_4930-2
by Mark Savoca, on Flickr


IMG_4934-2
by Mark Savoca, on Flickr


IMG_4939-2
by Mark Savoca, on Flickr


IMG_4944-2
by Mark Savoca, on Flickr


IMG_5234
by Mark Savoca, on Flickr


IMG_5237
by Mark Savoca, on Flickr

more to follow...
 

marksavoca

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I built the flywheel from 3/8 x 3/8 steel bar.

IMG_5492
by Mark Savoca, on Flickr


IMG_5552
by Mark Savoca, on Flickr


IMG_5598
by Mark Savoca, on Flickr

For the gears, I started with commercial gears and machined to the design.

IMG_6331
by Mark Savoca, on Flickr


IMG_6856
by Mark Savoca, on Flickr

More components

IMG_6838
by Mark Savoca, on Flickr


IMG_6952
by Mark Savoca, on Flickr


IMG_5738
by Mark Savoca, on Flickr


IMG_6948
by Mark Savoca, on Flickr

All metal components were Blued.

IMG_7228
by Mark Savoca, on Flickr


IMG_7230
by Mark Savoca, on Flickr

Finally, I assembled all of the parts to complete the engine.

IMG_7355
by Mark Savoca, on Flickr


IMG_7357
by Mark Savoca, on Flickr
 

bigal2749

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Interesting engine with an interesting design

I am lost as to how the rotary
gear works
 

marksavoca

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Interesting engine with an interesting design

I am lost as to how the rotary
gear works
The valve body has 4 ports, an input, output, bottom of the cylinder and top of the cylinder. The rotating brass valve has an inner chamber and an outer chamber. The input port is always in the inner chamber, the output port is always in the outer chamber. As the valve rotates, the top and bottom cylinder ports switch from the inner to outer chambers.

A picture:

Screen Shot 2020-03-10 at 3.30.23 PM.png


I hope that helps.

Thanks for the feedback!
Mark
 
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