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Martin_H
01-24-2012, 07:38 PM
This is pretty neat.

http://www.backyard-workshop.com/blog-posts/all-blog-posts/163-3d-printed-wobbler-engine.html

W9GFO
01-24-2012, 07:48 PM
It is.

Too bad he put the crank pin on the wrong side...

erco
01-24-2012, 08:59 PM
Too bad he put the crank pin on the wrong side...

+1 :)

Martin_H
01-24-2012, 09:08 PM
Too bad he put the crank pin on the wrong side...

I'm hoping that there's no such thing as a stupid question. But the engine is working and looks like other wobblers I've seen. How should it change?

W9GFO
01-24-2012, 09:30 PM
Ideally the crank pin would be opposite the side with the extra mass. It is for balancing.

Like this;

88929

Martin_H
01-24-2012, 09:32 PM
Thanks, that makes perfect sense.

Phil Pilgrim (PhiPi)
01-24-2012, 09:56 PM
That image brings up another question: How does a stopped steam locomotive get started going the right direction? Do the wheels operate valves in similar fashion to the crankshaft of an internal combustion engine?

-Phil

W9GFO
01-24-2012, 10:20 PM
I don't know, could be a live axle so that the other side is offset 90 degrees.

Dave Hein
01-24-2012, 10:32 PM
This video shows how it works - http://www.backyard-workshop.com/blog-posts/all-blog-posts/163-3d-printed-wobbler-engine.html . That's pretty cool. I gotta get one of those!

SRLM
01-24-2012, 10:40 PM
That image brings up another question: How does a stopped steam locomotive get started going the right direction? Do the wheels operate valves in similar fashion to the crankshaft of an internal combustion engine?

-Phil

The cranks on each side of a steam locomotive are offset so that at least one piston can always move the axle.

As far as reversing each piston, there is a reversing bar ("quadrant") that controls the timing of the piston valve. This piston valve is the smaller cylinder on top of the main steam cylinder, and it controls the admittance of steam onto each side of the main piston. The quadrant can be seen in the image below as the stretched "0" shape on the left hand side. Neutral is right in the middle, and forward would be at one end and reverse at the other.

http://farm3.staticflickr.com/2712/4318514332_c73a2effce_z.jpg?zz=1

A very nice model oscillating steam engine is sold by PM Research, another great made in America company: http://www.pmresearchinc.com/store/product.php?productid=3085&cat=4&page=1

Phil Pilgrim (PhiPi)
01-24-2012, 10:47 PM
I don't know, could be a live axle so that the other side is offset 90 degrees.


The cranks on each side of a steam locomotive are offset so that at least one piston can always move the axle.

You're right, according to this article, too: http://en.wikipedia.org/wiki/Steam_locomotive#Steam_circuit

Thanks, guys, for the additional info!

-Phil

Franklin
01-25-2012, 05:43 AM
http://www.youtube.com/watch?v=CEkK50pbgMw http://www.youtube.com/watch?v=gvJfPOAsw68&feature=endscreen&NR=1

GeeksGoneBad
06-30-2012, 01:01 AM
Hey guys! I was just hunting down bad links to my site and saw this one :)

yes I put the pin on the wrong side LOL DOH! - still works though - probably because there's really not a lot of "mass" involved in this - it's just lightweight plastic really :)

anyway here's a good link - the old site went bye bye :) http://www.backyardworkshop.com/blog-posts/all-blog-posts/163-3d-printed-wobbler-engine.html

and if you like that one check out this one ;) http://www.youtube.com/watch?v=3MSdwa_U0XM&feature=youtu.be

Jamie