Author Topic: Strictly.... “ Hot Air “  (Read 71663 times)

Offline Jasonb

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Re: Strictly.... “ Hot Air “
« Reply #105 on: March 01, 2018, 06:54:16 PM »
Thanks Graham, although aluminium or brass would be nice and easy to cut it out of I think it will be in steel as that has similar conductivity to iron and it will allow me to silver solder the round cylinder to a flat base that has been milled out for the passages and a sheet metal top.

Will probably also do a steel cylinder again for easy soldering and CI piston

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #106 on: March 04, 2018, 04:00:01 PM »
Hey there Jo.

Look what I found, one of my castings WITHOUT that " special " coating.   ;)

Things are coming along smoothly just the displacer piston to finish.

Cheers Graham.

Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #107 on: March 04, 2018, 04:25:54 PM »
Hey there Jo.

Look what I found, one of my castings WITHOUT that " special " coating.   ;)

:o

Are you sure it has been correctly aged  :thinking:

Jo
Enjoyment is more important than achievement.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #108 on: March 04, 2018, 04:51:01 PM »
Hey there Jo.

Look what I found, one of my castings WITHOUT that " special " coating.   ;)

:o

Are you sure it has been correctly aged  :thinking:

Jo

Hi Jo.

By " it " should have read " they " .... Yes a bag of four was found lurking in an original Buckley foundry Polypropylene sack in almost perfect condition.

Minimum age of 12 years normalisation.

Cheers Graham.
« Last Edit: March 04, 2018, 05:00:42 PM by Alyn Foundry »

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #109 on: March 07, 2018, 06:38:04 PM »
I've nearly finished it !!   :)

 <a href="https://www.youtube.com/watch?v=kJ30ubhD_Fg" target="_blank">http://www.youtube.com/watch?v=kJ30ubhD_Fg</a>

Cheers Graham.

Offline Jasonb

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Re: Strictly.... “ Hot Air “
« Reply #110 on: March 07, 2018, 08:01:14 PM »
Looks Good Graham, I suppose the simpler linkage produces far less friction then the parallel motion.

Shame you got all those linkages cast as they seem surplus to requirements now ;)

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #111 on: March 08, 2018, 11:41:53 AM »
Looks Good Graham, I suppose the simpler linkage produces far less friction then the parallel motion.

Shame you got all those linkages cast as they seem surplus to requirements now ;)

Thanks Jason.

Very probably, but the consensus is that the parallel motion looks far more pleasing.

Cheers Graham.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #112 on: March 08, 2018, 03:20:36 PM »
Hello All.

It seems to be a bit " one sided " on this thread, surely there are others building hot air engines? C'mon let's see em....

As a kitchen range is a little overkill for the average rally scene I will be showing my method of providing a neat little burner for the Robinson to run on. All you need is a proprietary made gas burner, Primus, Sievert etc and some bar stock. More to come....

Cheers Graham.


Offline Jo

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Re: Strictly.... “ Hot Air “
« Reply #113 on: March 08, 2018, 03:31:45 PM »
Hello All.

It seems to be a bit " one sided " on this thread, surely there are others building hot air engines? C'mon let's see em....

I am still waiting for my castings  :(

Jo
Enjoyment is more important than achievement.

Offline Bluechip

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Re: Strictly.... “ Hot Air “
« Reply #114 on: March 08, 2018, 03:48:34 PM »
Hello All.

It seems to be a bit " one sided " on this thread, surely there are others building hot air engines? C'mon let's see em....

I am still waiting for my castings  :(

Jo

I'm still waiting for it to warm up ...  :old:

Dave

Offline Jasonb

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Re: Strictly.... “ Hot Air “
« Reply #115 on: March 08, 2018, 03:50:14 PM »
I won't be needing castings but will be a bit later in the year before I get round to starting mine.

Plan to have the base that was used for coal firing with a chimney and hope a tea light or mamod fuel tablet will provide the heat.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #116 on: March 08, 2018, 06:04:59 PM »
I won't be needing castings but will be a bit later in the year before I get round to starting mine.

Plan to have the base that was used for coal firing with a chimney and hope a tea light or mamod fuel tablet will provide the heat.


Hi Jason.

Yes that'll look really nice.

An old friend who departed nigh on 20 years now built his engine upon an actual Coal fired arrangement. He fabricated the firebox from some Steel tube and it really looked " the business " ! With a little cast Iron door, firebrick lined and a grate. His collection was dispersed, I wonder who has it now?

Jo.

There's a trip planned for the Midlands within the next few weeks.... Patterns for hot air engine, Sphinx and anything anyone might be interested in?? Just PM me.   :)

Cheers Graham.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #117 on: March 10, 2018, 11:33:26 AM »
Good morning Richard.

I moved your post here.

“ Speaking of oiling, what if any were the arrangements for the hot air engine? Did it have a cylinder oiler and a lubricator on the crankshaft bearing? Oil holes in the various links and rods?

Richard “

You see many models “ adorned “ with fancy Brass bits n bobs but having had the privilege of working on many original engines, they were pretty basic.

The cylinder has no provision for a lubricator, link motion has simple “ centre drill “ cups on each pivot point. The crankshaft bearing was done in the same manner as the link motion.

Over the last couple of days I’ve been running the Anson Robinson for hours at a time using ordinary engine oil. I discovered that by adding a little Paraffin/ Kerosene to the cylinder lubricant the engine speeded up quite dramatically, even oil viscosity makes a big difference!

Cheers Graham.

Offline Alyn Foundry

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Re: Strictly.... “ Hot Air “
« Reply #118 on: March 10, 2018, 06:41:49 PM »
Update.

After several hours of running the Anson Robinson I noticed that the displacer piston rod was rotating, annoyingly.

Closeup of the improved con rod roller attached, no more side to side!

Cheers Graham.

Offline Jasonb

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Re: Strictly.... “ Hot Air “
« Reply #119 on: March 10, 2018, 08:00:07 PM »
Another (more elegant  ;)) solution might be to have a fork shape to the rod end with the slot sized to just clear the conrod.

 

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