Author Topic: Stirling Engine  (Read 2899 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

Online 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.

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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.

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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.

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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

Online 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