Steam engine

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Dang911
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Steam engine

Post by Dang911 » Tue Oct 31, 2006 12:06 am

As a project to keep myself busy, I would like to build a small steam engine, one maybe cylinders with a boiler. Something for a nice desk model, it will mostly likely not power anything.

Does anyone have some good clear plans on the parts/ assembly. I will CNC almost everything (I know it takes the fun out of it). Please feel free to post blueprints in any format (CAD's) etc.....

Thanks In advance!
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marksteamnz
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re: Steam engine

Post by marksteamnz » Tue Oct 31, 2006 5:53 am

Check out plans and blueprints group on Yahoo. They have a bunch of steam engine files from memory.
http://groups.yahoo.com/group/plansandblueprints
Cheers
Mark Stacey
www.cncprototyping.co.nz

Dang911
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re: Steam engine

Post by Dang911 » Sun Nov 05, 2006 9:08 pm

Oh hell, what started out as one cylinder, turned into 4, and at that point I just figured I would make the whole thing original, so I completely designed it myself. Feel free to build it, but you might want to wait till I do first. Its an inline 4, single stroke, with a total displacement of 22 cc. Its going to have aluminum pistons, brass sleeves, aluminum rods, stainless shafts, and brass cams. I will start with using UHMW-PE bushings, but may buy bearings after the engine has proven itself. It has a 0.75" stroke AND bore. Rough estimates prove a conservative 2++HP.
Attachments
Steam Engine.pdf
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engine6.PNG
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engine3.PNG
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engine1.PNG
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re: Steam engine

Post by Johansson » Sun Nov 05, 2006 10:09 pm

Fun project!

//Anders

Dang911
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re: Steam engine

Post by Dang911 » Wed Nov 15, 2006 1:13 am

Well, after a bit of CNC programming, I made my first piston. I CNC milled the inside, and then I manually added the oil grooves and then turned down the outside with a tolerance of 0.0005". I might consider CNC programming the lathe, but I think it will take longer to program and set up for each run, than it will take to just do it manually.

Piston made from 6061 which I then polished.
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P3.JPG
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P2.JPG
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P1.JPG
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Jim Berquist
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re: Steam engine

Post by Jim Berquist » Sat Nov 18, 2006 3:14 am

Dang911:

Looks cool! I could not find how you was going to inject the steam?


Do you have any Idea's on a Stirling Engine ?? I have a 8 ft satellite dish that I would like to repaint crome and run a Stirling!!! Think the bakeing link!!!

I was thinking a fly wheel and piston set up!

Do you have something better for me???

Jim
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Dang911
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re: Steam engine

Post by Dang911 » Sat Nov 18, 2006 7:45 pm

The PDF blueprint was thrown together quickly, and did not represent any pipe runs. The 4 cylinders all have a hole at the end. Cylinders 1,3 will be connected together with a pipe, and the same for 2,4. On either side of the 4 cylinder grouping, I have built valves, each with a pressure inlet, and an exhaust outlet, and then an outlet/inlet to each cylinder group. Its a double acting valve. The one on the left will control 1,3 the valve on the right will control 2,4. While one set of cylinders is being pressurized and pushed down, the other are releasing their air. Both pressurizing and depressurizing all comes from that single hole at the top of the cylinders, that's what made the double acting valve necessary. The valves will also time the engine, and I have done the most calculation in achieving the longest port open time, with the quickest close possible, for the most power.

A stirling is basically a large piston, with a heat source on one side, and a cool source on the other, using your make shift parabolic mirror, it should produce more than enough heat to run a medium sized stirling.
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re: Steam engine

Post by Dang911 » Tue Nov 21, 2006 12:27 am

RODS.... Also polished 6061
Attachments
P1010019.JPG
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P1010021.JPG
P1010021.JPG (24.74 KiB) Viewed 13873 times
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Dang911
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re: Steam engine

Post by Dang911 » Wed Nov 22, 2006 1:51 am

The cams on the crank, 12 in total. 360 brass

Machined or Polished?
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re: Steam engine

Post by Johansson » Wed Nov 22, 2006 11:17 am

Beautiful work!

//Anders

Nick
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Re: re: Steam engine

Post by Nick » Sun Dec 03, 2006 9:27 am

Dang911 wrote:Oh hell, what started out as one cylinder, turned into 4, and at that point I just figured I would make the whole thing original, so I completely designed it myself. Feel free to build it, but you might want to wait till I do first. Its an inline 4, single stroke, with a total displacement of 22 cc. Its going to have aluminum pistons, brass sleeves, aluminum rods, stainless shafts, and brass cams. I will start with using UHMW-PE bushings, but may buy bearings after the engine has proven itself. It has a 0.75" stroke AND bore. Rough estimates prove a conservative 2++HP.
Really nice project mate, a small suggestion if its not too late, or perhaps on another later version?.
if you are going down the multicyclinder route you could quite easily do a triple expansion engine, for steam of course with air there's little point but it occurs to me you could do this with out further complication.
I dont know if you are familiar with triple expansion theory but basically it means 3 cylinders each larger than the other with the smallest (HP) being injected with steam first, this then vents into the 2 larger cyl where the steam continues to expand and finally the LP (largest cyl) which takes care of the final expansion. It would be really nice to see a CNC'ed version of that going!.
I have a small CNC mill that would easily cope with this sort of thing, i think you may have inspired me to use it for this sort of thing, cheers.
Nick

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re: Steam engine

Post by Dang911 » Sun Dec 03, 2006 2:36 pm

I am really trying to stay away from more complication, and I do not really care too much about efficiency on my first engine. I am almost done, just finishing up boring the cylinders. Maybe on a second engine that would be a cool feature to add.
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Steam Engine

Post by Dang911 » Sun Jan 07, 2007 2:41 am

Time for an update....

I am now at the stage of final assembly, everything has been machined. The valves and cylinders are supported by two machined pieces of white derlin. I machined my pillow blocks from aluminum and then tapped them to simplify mounting. Each one will hold two ball bearings. I am in the process of building my crank, the last major thing needed to be assembled. The finished engine should be done with in the next week or so!
Attachments
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4.JPG
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2.JPG
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1.JPG
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Post by Nick » Sun Jan 07, 2007 6:15 pm

Reaaaaaly nice mate!, i like the idea of holding all the cylinders with the delrin i look forward to seeing more!

cheers

Nick

Jim Berquist
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xxx

Post by Jim Berquist » Sun Jan 07, 2007 7:19 pm

Dang911:

We us Derlin at work to build fixture blocks. We don't subject it to any heat. How will it hold up???? Will it get soft? Just a thought! Your not using it were it would be subject to any really high heat exept the injection or head end. I don't know the thermal properties of it!

Jim
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