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Steam Engine (Build Log)

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Unread postAuthor: VH_man » Thu Jan 08, 2009 8:33 pm

Ha ha Yes I could... Problem is I think i would run into the problem of it cycles TOO fast.

If I stop the piston from going out too far, I can get this system to cycle fast enough to make the "brrrappp" a high-pitched whine :twisted:

And your English is Fine. If i can read it, Its great.
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Unread postAuthor: inonickname » Thu Jan 08, 2009 8:36 pm

Cool, good luck. For my year 9 metalwork project I machined an air/CO2 engine. I'll post some pics in a min..
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Unread postAuthor: VH_man » Thu Jan 08, 2009 8:36 pm

SpudBlaster15 wrote:I built a steam engine 3 years ago. The valve system is somewhat similar to that of a cross scavenged 2 stroke engine, but it uses lateral movement of the cylinder itself to time the intake and exhaust ports. Every part was made by me using a lathe, a milling machine, a bandsaw, a belt sander, a drill press, and a oxy/acetylene brazing/soldering setup.

Image


This is What I call an "oscillating" engine.

If i had access to a Mill I would, but I have a drill press..... And possibly a wood lathe. Hell, If I had access to a Mill, Id be done already....

Not to mention, there's not enough moving parts to entertain the kiddies for hours on end.....

Got any videos of your engine running? I just love watching them run, Specially really fast.....
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Unread postAuthor: SpudBlaster15 » Thu Jan 08, 2009 8:48 pm

Oscillating only describes one component of the engine's motion. Otherwise, it is just a standard reciprocating engine. I would have used a complete reciprocating setup, but adding a wrist pin and upper connecting rod bushing proved to be more effort than it was worth. It would have also required the use of a different valve system.

I have ran it at 120psi, at which point the crankshaft is surprisingly well balanced, and causes little vibration. It runs quite fast, but I don't have a tachometer to measure the rotational rate.

A mill isn't required to build something like this. All of the work I used it for could have been done with manual saws and files. A lathe is a must though.
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Unread postAuthor: VH_man » Thu Jan 08, 2009 8:53 pm

SpudBlaster15 wrote:A mill isn't required to build something like this. All of the work I used it for could have been done with manual saws and files. A lathe is a must though.


May I ask why a lathe is a must? I can make my parts out of precision brass tubing and epoxy, Its worked for me in the past.
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Unread postAuthor: inonickname » Thu Jan 08, 2009 9:04 pm

Image

Complete engine.

Image

Rear of engine with cylinder removed.

Image

Piston and crankshaft.

Image

Cylinder and block.

Works awesome except for a few problems. Cylinder was polished until I had to put it back in the lathe to take 3mm off the top -.-. The pin (which actuates the valve) was broken after running it on 140 psi. Easy fix and I also need to bore a new exhaust.
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Unread postAuthor: VH_man » Thu Jan 08, 2009 9:11 pm

I envy all you with Machining abilites...

Nice engines BTW. I hope mine looks somewhat as good.....
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Unread postAuthor: SpudBlaster15 » Thu Jan 08, 2009 9:12 pm

If you're scratch building all of the parts, a lathe is a must. Otherwise, you might be able to get away with adapting other parts to work. For the design I used, half assed, low precision epoxy construction would lead to massive imbalance and slop, which would vibrate the engine apart in a very short period of time. All of the parts must fit together with reasonably high accuracy in order for everything to work properly. Especially the flywheel, crankshaft and crankshaft bushing, the crank journal, and the piston. A lathe also ensures that the threads are cut straight, which is virtually impossible to achieve with a die and manual handle.

Keep in mind that this is based entirely on my experience. I strive for high precision and accuracy in any project that involves complex or continuously repeated motions. For the most part, spudding does not require high precision and accuracy until you reach semi and fully automatic setups. An engine does. So while I have only built a few spudding parts using a lathe, for some projects I will use one almost exclusively.
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Unread postAuthor: VH_man » Thu Jan 08, 2009 9:15 pm

Well, My friends Dad is a Machinist by trade, So i MIGHT be able to get in and Mill/lathe some parts... It would make my life very easy actually....

We will see. I think I can do this without a Lathe, And just a Drill press. We will see.
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Unread postAuthor: VH_man » Tue Jan 13, 2009 7:02 pm

WOHOOO!

Finished my Engine this afternoon, And it runs Beautifully! Check here for Video/Pics....

Im sooo exited right now.... its not even healthy.
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Unread postAuthor: jrrdw » Tue Jan 13, 2009 7:09 pm

Click where? Click what? Your missing a link or two. :P
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Unread postAuthor: SEAKING9006 » Tue Jan 13, 2009 11:00 pm

He's got CA3-itis. He's so happy he got it done he posted about it before anything is done uploading.
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Unread postAuthor: VH_man » Wed Jan 14, 2009 6:16 am

jrrdw wrote:Click where? Click what? Your missing a link or two. :P


I couldn't help myself but to post something before my video was finished uploading.......

Anywho, Heres my Videoooo! Pics will come eventually.

[youtube]http://www.youtube.com/watch?v=JqpoHiUJbOk[/youtube]

I shall post specs if anyone wants them.
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Unread postAuthor: Zippster » Thu Jan 15, 2009 6:34 pm

I've been thinkin of building something like this for a while now, with the ultimate end goal being making one run off of internal propane combustion - and maybe even use it to motorize something if I can get enough horsepower out of it.

But the first step is to make one run off of air, so on that note,

post them specs! :twisted:
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Unread postAuthor: VH_man » Thu Jan 15, 2009 7:50 pm

Image

Tadaa! (interestingly, This was taken with the engine RUNNING at about 10-15 PSI... Its a blur ususally, But the camera flash makes it "freeze". Its kinda cool.

Anyway, Heres more pics:

Valve (bits and Parts, Self Explanitory)
Image

Piston/Cylinder (3/8in Rod, .40 cal Blowgun Barrel Peice)
Image

Crankarm. Left bend is Valve, Right Bend is Cylinder. Note that they are 90 Degrees out-of-phase. VERY IMPORTANT
Image

And of Course, The engine Running:
Image

Specs:

Piston Throw: .3in
Valve Throw: .25in
Piston Diameter: 3/8in
Minimum Pressure: 4 Psi
Flywheel Mass: 250g
RPM: Unkown
Tourque: What do you expect from such a small piston throw and diameter? lol.

Any more questions and I shall Answer
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