My First Walking Beam Stirling engine build with pictures

Discussion on Stirling or "hot air" engines (all types)
Ian S C
Posts: 2221
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: My First Walking Beam Stirling engine build with pictures

Post by Ian S C » Tue Sep 15, 2015 6:36 pm

Gold medals for the twin engine, and the Watts Beam engine.
Ian S C

manvstaco
Posts: 15
Joined: Wed Sep 02, 2015 9:17 pm

Re: My First Walking Beam Stirling engine build with pictures

Post by manvstaco » Thu Sep 17, 2015 4:32 pm

***New photos added to original post***

@triangle.Stirling My furnace is already starting to crack here and there :( I have seen your electric furnace on some of your you-tube videos, I'm jealous :D How much did you end up buying it for? Thank you for the flywheel compliments! I did work really hard on it, it was my first casing in my entire life :) I made the Styrofoam mold bigger than I needed it to be with the intention of spinning it down to a nice and even finish.

@Ian S C Thank you for the bearing tip! as of now they are holding very nicely, I made it a point to not cut the holes too big so they almost require a press to install. I got lucky and my next door neighbor had a bunch of brass tubing(not rolled!) he inherited from his dad years ago! It fits inside my copper piston wall perfectly! They will make great piston sleeves I feel. The inside diameter of my Copper tubing is around 26mm and the inside of the brass tubing is 22.5 mm without any boring/honing. I'm thinking I might be able to get away with the same stroke on the power piston with the smaller diameter but we'll see!! I know I could always reduce the stroke of the displacer cylinder to compensate for this but feel that would be a loss in efficiency.

Enjoying the input and ideas from you guys thank you :)
Last edited by manvstaco on Thu Sep 17, 2015 4:51 pm, edited 1 time in total.

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: My First Walking Beam Stirling engine build with pictures

Post by Triangle.Stirling » Thu Sep 17, 2015 4:43 pm

Lol, my furnace is not 'starting to crack, its literally falling apart. Haven't made a video with my electric furnace yet, that will come later but am very busy with school ATM. I bought it for 50 dollars though, in really good shape. They had to get rid of it fast because they were moving and didn't want to take it with them.

About your mould: was that normal 'packing' Styrofoam, and did you cut it with a knife or a hot wire cutter?

I'll take a look at the photos and check for updates:) I would keep the displacement ratio about 1:1.5 , that should be the best. So 1.5 for displacer displacement and 1 for power piston. But a very long stroke isnt very good I think as you mentioned.

What is your power piston made of? Looks like graphite, or is it JB weld mixed with graphite?

Good luck with Building!

Verstuurd vanaf mijn XT1068 met Tapatalk

manvstaco
Posts: 15
Joined: Wed Sep 02, 2015 9:17 pm

Re: My First Walking Beam Stirling engine build with pictures

Post by manvstaco » Thu Sep 17, 2015 5:00 pm

Triangle, it was the Styrofoam from the dollar store that comes in sheets 1/4inch thick with paper glued to each side. I just peeled the paper off and cut them out with a box knife, stuck them together with spray adhesive and cleaned it up a bit on a sanding wheel.
power piston is 2 part epoxy mixed with an excessive amount of graphite powder and spun on my lathe

Score on the furnace price :D

manvstaco
Posts: 15
Joined: Wed Sep 02, 2015 9:17 pm

Re: My First Walking Beam Stirling engine build with pictures

Post by manvstaco » Sun Nov 15, 2015 7:53 pm

To be continued this winter :)
Will post more once I complete the second cylinder.

Triangle.Stirling
Posts: 133
Joined: Mon Sep 09, 2013 8:29 am

Re: My First Walking Beam Stirling engine build with pictures

Post by Triangle.Stirling » Wed Dec 30, 2015 4:11 pm

as it's already winter, any news on the engine?

manvstaco
Posts: 15
Joined: Wed Sep 02, 2015 9:17 pm

Re: My First Walking Beam Stirling engine build with pictures

Post by manvstaco » Mon Apr 25, 2016 9:09 pm

Hello all! Hello Triangle! Sorry it's been soo long, I haven't played with this engine since my last post, I bought a YJ jeep wrangler and those projects took most of my winter to complete.
Here is my most recent work on the Stirling.
Designed this and made it on my newest CNC machine. It will be a way to hold the two pressure cylinders, the little rectangular holes will be for a washers and nuts, as holes will be drilled through it to tighten around the cans with a long bolts
Image

Here is a mock up! I can't wait to get the two cylinders working together. I will be taking my time tweaking this design, I would like to get this working really well.
Image

Here is a sign I made the other day, I think once I get my design down I'll try to make it look a little more pleasing to the eye by carving a bit of designs into it and putting on a nice finish like this sign I made for a friend. I would like to start trying to sell them at the farmers market and etsy. I think with my CNC machines I can duplicate them and make about one a day, not really sure what to charge for them quite yet, but we shall see :)
Image

Wellington
Posts: 143
Joined: Mon Apr 18, 2016 4:02 am

Re: My First Walking Beam Stirling engine build with pictures

Post by Wellington » Tue Apr 26, 2016 7:47 am

Looks good. One easy and cheap way to cast small parts is to use the delft clay casting system:

Wellington

manvstaco
Posts: 15
Joined: Wed Sep 02, 2015 9:17 pm

Re: My First Walking Beam Stirling engine build with pictures

Post by manvstaco » Tue Apr 26, 2016 9:50 pm

Wellington wrote:Looks good. One easy and cheap way to cast small parts is to use the delft clay casting system:

Wellington
Oooo I like this! I'll have to try it!

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