Author Topic: Strictly.... “ Hot Air “  (Read 71671 times)

Offline Roger B

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Re: Strictly.... “ Hot Air “
« Reply #390 on: December 05, 2018, 07:26:23 PM »
Splendid  :praise2:  :praise2: As the others have said just a tea light is pretty impressive  :wine1: (that's your glass for Thursday  :stir: )
Best regards

Roger

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #391 on: December 05, 2018, 08:52:25 PM »
Thanks Guys  :)

Another engine to put away into the collection. Hopefully I might be able to swop it for another set of castings  :naughty:

Jo
Enjoyment is more important than achievement.

Offline Dave Otto

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Re: Strictly.... “ Hot Air “
« Reply #392 on: December 05, 2018, 09:45:29 PM »
Nicely done Jo, I like the color too!

Dave

Offline Steamer5

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Re: Strictly.... “ Hot Air “
« Reply #393 on: December 06, 2018, 06:17:33 AM »
Very nice Jo. You just need to scale the candle down to see how little it needs

Cheers Kerrin
Get excited and make something!

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #394 on: December 07, 2018, 11:28:53 AM »
Thanks Guys  :)

Continuing on with the Polly Robbie...

The Displacer Cylinder  :facepalm2: I ended up having to turn shoulders on the two ends, wire the outer and keep the whole lot together using a piece of threaded rod. Easy flow wouldn't run so I ended up using some even higher percentage silver solder (=lower temperature melting) to do the joining. Its together  :paranoia:

Do I want to do it again  :hellno:

Jo
Enjoyment is more important than achievement.

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #395 on: December 07, 2018, 04:31:36 PM »
The main part of the engine that still has to be finished is the platform this requires a hole drilled along the length of the casting for the passing of the heated air. Then the parts have been joined together with JB Weld. And finally the hole taken through the other part.

Now I just have to wait for it all to go off :drinking-41:

Jo
Enjoyment is more important than achievement.

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #396 on: December 09, 2018, 04:10:44 PM »
The Links: are soft and they do not match the drawings, they are however about the right length. I decided on redesigning to use the supplied links and not to use smooth pivots or attempt pinning with 10BA screws but to make screwed pivots.

Before drilling, reaming and tapping the holes it was necessary to pack between the arms.  I couldn't find any easy way to stop the arms bending all over the place to let me mill out the centre slot so I used a needle file and did it by hand  ;)

Another Weekend is over  :-\ so its another week in the Workshop to look forward to  :ThumbsUp:

Jo

Enjoyment is more important than achievement.

Online 10KPete

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Re: Strictly.... “ Hot Air “
« Reply #397 on: December 09, 2018, 04:47:09 PM »
 :ThumbsUp: :ThumbsUp:

 :popcorn:

Pete
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SB 10K lathe, Benchmaster mill. And stuff.

Offline b.lindsey

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Re: Strictly.... “ Hot Air “
« Reply #398 on: December 09, 2018, 04:54:07 PM »
Got to love retirement eh Jo? Like an endless weekend  ;)

Bill

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #399 on: December 09, 2018, 06:22:38 PM »
Retirement is hard Bill  I have to keep looking up the Dilbert cartons to remind me what I am missing so I don't  forget  :noidea:

I reckon I am over the worst bits of this engine so I have been asking Surus to see if he has started thinking about the next set of castings I can have out of his collection ;D

Jo
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Offline ettingtonliam

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Re: Strictly.... “ Hot Air “
« Reply #400 on: February 06, 2019, 02:13:19 PM »
Just to wake up this thread, cos its been ignored since early December.
I know there was a lot of discussion about a year or so ago about making the diffuser? piston for the Alyn Foundry version from tin cans.
To be honest I wasn't ever too keen on that, and although I have made one that way, it isn't something I'm proud of, even though its hidden away inside the engine.
I'm thinking of a brass one, 2 flanged end plates and a barrel, probably 26G brass, soft soldered together, though it could be silver soldered if necessary. Yes, I've got the stainless steel pot scourers ready to stuff it with. It will be a bit heavier than the tin can version, but not that much.

Any thoughts?

Offline Jasonb

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Re: Strictly.... “ Hot Air “
« Reply #401 on: February 06, 2019, 03:13:42 PM »
I recall Graham saying that brass was not a good material as it conducts heat too easily. On the small one I made the piston was machined from stainless bar and I know somebody who had a job to get a Polly one going until he ditched their brass pistion and did the same as me. At your size starting with stainless tube may be a better bet.


Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #402 on: May 31, 2020, 12:00:39 PM »
A recent find from the Gardner archives, courtesy Geoff Challinor Anson Engine museum.

The number 6 is indeed a " formidable " hot air engine.

Cheers Graham.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #403 on: June 22, 2020, 04:12:24 PM »
Hello All.

I've discovered that the " construction notes " for the half scale Robinson hot air engine have been misplaced.

Can anyone help find a former customer that might still have a set please?

Cheers Graham.

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #404 on: June 22, 2020, 04:25:50 PM »
I've discovered that the " construction notes " for the half scale Robinson hot air engine have been misplaced.

There should have been construction notes   :thinking:  I didn't get any   :disappointed:

Jo
Enjoyment is more important than achievement.

 

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