Author Topic: Stirling Engine  (Read 2903 times)

Offline Doc

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Stirling Engine
« on: February 23, 2018, 10:02:51 PM »
 I started modeling and putting together a Stirling engine design back a long time ago. I used it as training for learning CAD when I became a CAD tooling design engineer. I thought well maybe some day I would build it. Well today is the day I start. It has been a long time in the works. I put a few finishing touches on the model and will start it soon.
George

Offline philf

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Re: Stirling Engine
« Reply #1 on: February 24, 2018, 04:03:58 AM »
Hi Doc,

Looking forward to seeing this build. It's something I've always wanted to make.

Cheers.

Phil.
Phil Fern
Location: Marple, Cheshire

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Re: Stirling Engine
« Reply #2 on: February 24, 2018, 09:36:17 AM »
Got a small start. Cut material and turned up a spud on each end these will be used for aligning the hot cap with it left them oversized until the inside dia is bored. I will locate on the inside bore to turn the fins and at that time I'll finish the end alignment spuds.

PS also the length was cut to finish and I'll post a video here after I get a little further along.



George

Offline Stilldrillin

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Re: Stirling Engine
« Reply #3 on: February 24, 2018, 02:09:44 PM »
I'm watching George.

Hoping to learn something new.....  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Doc

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Re: Stirling Engine
« Reply #4 on: February 24, 2018, 02:41:52 PM »
  The bore finished and mounting hole done (the spuds on the ends will be finished to a finish dia later)

Next step is to cut cooling fins.

A video is uploading and I will post later.
Here is a pic for now.
George

Offline tom osselton

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Re: Stirling Engine
« Reply #5 on: February 24, 2018, 04:00:07 PM »
I'm watching too.

Offline Doc

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Re: Stirling Engine
« Reply #6 on: February 24, 2018, 07:19:38 PM »
The start of build.

George

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Re: Stirling Engine
« Reply #7 on: February 24, 2018, 08:24:41 PM »
Cooling fins done.
Here is a pic video is uploading should be posted tomorrow sometime.
George

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Re: Stirling Engine
« Reply #8 on: February 26, 2018, 05:41:19 PM »
Took awhile my internet provider had issues.


George

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Re: Stirling Engine
« Reply #9 on: February 27, 2018, 05:12:10 PM »
Ok got started on the hot cap started by drilling the ID out. She was a little tough but didn't go to bad.


George

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Re: Stirling Engine
« Reply #10 on: February 28, 2018, 05:21:02 PM »
Got it bored out to size and bottom flattened out. Flattening the bottom was a real pain but I got it without wrecking anything.
Next I will finish up the od and flang.



George

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Re: Stirling Engine
« Reply #11 on: March 01, 2018, 05:47:51 PM »
Ok finished up the hot cap for now unless II decide to change it and add material to the end of it.



And here is a video of finishing it and no laughing at the struggle I had with it. :lol:

George

Offline tom osselton

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Re: Stirling Engine
« Reply #12 on: March 02, 2018, 12:08:58 AM »
Well that was humourous! Scribing or scoring the shaft is a good idea I'll have to remember that! It's coming along nice though.

Offline AdeV

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Re: Stirling Engine
« Reply #13 on: March 02, 2018, 05:19:34 AM »
Hi Doc,

Air pressure's a bitch, ain't it?  :lol:

To avoid this next time.... centre drill a small hole deep into your mandrel (somewhat deeper than the part, ideally); then cross-drill into it. Your part will then push on/pull off much more easily...

The only thing that might happen, is it might not hold on the mandrel quite so well when you're turning it, as it won't have air pressure to help it hold on.
Cheers!
Ade.
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Location: Wallasey, Merseyside. A long way from anywhere.
Or: Zhengzhou, China. An even longer way from anywhere...
Skype: adev73

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Re: Stirling Engine
« Reply #14 on: March 02, 2018, 04:42:57 PM »
Ok got a start on the displacer I chose to bore the ID first.





George

Offline tom osselton

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Re: Stirling Engine
« Reply #15 on: March 02, 2018, 07:47:17 PM »
Hi Doc,

Air pressure's a bitch, ain't it?  :lol:

To avoid this next time.... centre drill a small hole deep into your mandrel (somewhat deeper than the part, ideally); then cross-drill into it. Your part will then push on/pull off much more easily...

The only thing that might happen, is it might not hold on the mandrel quite so well when you're turning it, as it won't have air pressure to help it hold on.

After some thought I'd probably score a channel down the side leaving some untouched at the end to retain vacum until you want to release it by raising it to the channel.

Offline Doc

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Re: Stirling Engine
« Reply #16 on: March 02, 2018, 08:55:44 PM »
 Yes it would have been a good idea.
     I wasn't thinking about a vacuum problem I was only thinking of it scoring and not being able to get it off ( as that actually happened to me ) so adding pressure lube only made things worse. I've done smaller hot cap the same way but the size was a lot smaller for my stirling fans and it wasn't an issue. Leason learned hope I can remember it  :thumbup:
George

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Re: Stirling Engine
« Reply #17 on: March 02, 2018, 11:17:57 PM »
Ok finished the displacer tube by turning the OD and ended up about .03 wall thickness.



George

Offline philf

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Re: Stirling Engine
« Reply #18 on: March 03, 2018, 05:23:36 AM »
Looking good Doc! :thumbup:
Phil Fern
Location: Marple, Cheshire

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Re: Stirling Engine
« Reply #19 on: March 03, 2018, 08:31:53 AM »
Thanks Phil !


Ok have the displacer ends turned up.




George

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Re: Stirling Engine
« Reply #20 on: March 04, 2018, 01:29:09 PM »
Played with my first engine built and tried to get it running.


George

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Re: Stirling Engine
« Reply #21 on: March 09, 2018, 06:52:17 PM »
Awww darn made a boo boo so I need to do a little repair. Machining the main mount plate.




George

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Re: Stirling Engine
« Reply #22 on: March 10, 2018, 02:57:25 PM »
Well I fixed the dumb a** boo boo I made and dam near made another.
Ever have one f those days you should just not go out to the shop?   :palm:


George

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Re: Stirling Engine
« Reply #23 on: March 10, 2018, 10:04:27 PM »
Power cylinder done.

George

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Re: Stirling Engine
« Reply #24 on: March 11, 2018, 05:25:33 PM »
Ok I started a short little update uploading to youtube and then took my pal for a walk. We walked about 1.5 miles it was cool but not to bad. Just got back and here is the piston update.



George

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Re: Stirling Engine
« Reply #25 on: March 14, 2018, 05:26:02 PM »
Ok haven't done a whole lot the last few days been feeling a little under the weather. But here are some pics I took of where I'm at on it.
George

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Re: Stirling Engine
« Reply #26 on: March 15, 2018, 08:50:05 PM »
   I did get out in the and worked on the legs. It's seems a little top heavy right now I'll see after I get the flywheel made and put in place along with power cylinder and see how it feels the. If it still feels a little tipy and top heavy I'll add a couple cross beam under it to widen its stance. So here is what I've got so far.
George

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Re: Stirling Engine
« Reply #27 on: March 17, 2018, 02:56:42 PM »
Ok did a little this morning made the power cylinder mounting flange.
Cut it n the nc machine mounted cylinder temp with a couple of the screws.
George

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Re: Stirling Engine
« Reply #28 on: March 17, 2018, 07:36:53 PM »
Was really nice outside this afternoon ended up taking Rowdy "my boxer" for a long walk so didn't get a whole lot done this afternoon king of like this morning. But I did get the bearing mount blocks "pillow blocks". So I am making headway on it just not to fast.
George

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Re: Stirling Engine
« Reply #29 on: March 18, 2018, 07:53:44 PM »
Did a little today  and started looking at a burner design one thing I neglected to do yet.


George

Offline tom osselton

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Re: Stirling Engine
« Reply #30 on: March 20, 2018, 03:32:07 AM »
It's coming along nicely!

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Re: Stirling Engine
« Reply #31 on: March 21, 2018, 05:10:36 PM »
Ok I think I have burner that will work we shall see if it will or not. It maybe needing to be shortened up to allow more wick and a larger flame.



George

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Re: Stirling Engine
« Reply #32 on: March 25, 2018, 08:11:27 PM »
Worked on getting the flywheel done.



George

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Re: Stirling Engine
« Reply #33 on: March 25, 2018, 09:27:37 PM »
Starting to look like an engine with that flywheel!  :beer:
I love it when a Plan B comes together!
Steve
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Re: Stirling Engine
« Reply #34 on: April 07, 2018, 05:38:24 PM »
Well I'm officially retired been sick since my last day of work. Been struggling with a horrible cold. Anyway here is a short update.

George

Offline tom osselton

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Re: Stirling Engine
« Reply #35 on: April 08, 2018, 07:28:32 PM »
Well have a happy retirement!  :beer:

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Re: Stirling Engine
« Reply #36 on: April 09, 2018, 12:10:53 AM »
Thanks Tom!
George

Offline Stilldrillin

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Re: Stirling Engine
« Reply #37 on: April 09, 2018, 05:45:00 AM »
George.
 You retired, same date as me.... Just, 12 years later.

Relax. Settle in. Enjoy!  :thumbup:
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline Joules

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Re: Stirling Engine
« Reply #38 on: April 09, 2018, 06:40:05 AM »
Sod relaxing, you now have more things to do than ever before...    Still, enjoy retirement Doc.
Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Offline philf

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Re: Stirling Engine
« Reply #39 on: April 09, 2018, 01:08:50 PM »
Have a long and happy retirement George.

I don't seem to be able to find anywhere near as much time for the workshop as you do even before you retired and I finished my escape tunnel in April 2009!

Phil.
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Re: Stirling Engine
« Reply #40 on: April 09, 2018, 01:21:10 PM »
Thanks guys!
Haha I like that "finished my escape tunnel"  :lol:

I'm hoping to get a little more time in the shop. I know in the summer it probably wont happen with all the other things I want to get done. It did feel really weird this morning not heading off to work. This is my 2nd Monday of freedom.
George

Offline tom osselton

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Re: Stirling Engine
« Reply #41 on: April 09, 2018, 03:48:21 PM »
That's the nice thing though you can always visit!

Offline Doc

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Re: Stirling Engine
« Reply #42 on: April 14, 2018, 09:58:13 PM »
No Tom believe it or not can't enter the building not without 2 forms of ID and birth certificate. Even though I worked there it doesn't matter no entry one of their stupid rules! One of the reasons I left that and the dud I worked with was a dumb ass but the boss's pet which I had to re-do or fix his work continually with on credit for covering for him.


Any who I did get out in the shop a little.

George

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Re: Stirling Engine
« Reply #43 on: April 15, 2018, 12:42:06 PM »
Ok this will probably be the last post in this build.


Final post engine completed



George

Offline raynerd

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Re: Stirling Engine
« Reply #44 on: April 25, 2018, 05:35:10 PM »
Great job Doc. I enjoy watching sterling engines. :-)
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