Author Topic: The Alyn Foundry IF Allman engine.  (Read 6169 times)

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #120 on: December 20, 2018, 09:47:30 AM »
Graham is this the sort of thing the valve should look like? Gas coming in from the left to help push the valve down onto it's seat and a small light spring located on the two spigots. 1/4" x 40 for the pipe connections and 1/8" BSP for the plug and I have given the flanges a hex shape.

Offline Alyn Foundry

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Re: The Alyn Foundry IF Allman engine.
« Reply #121 on: December 20, 2018, 11:06:55 AM »
Good morning Jason.

Yes, pretty much.

As I mentioned previously I recessed the plug to house the spring to reduce sideways shift. I also had the valve a little higher up in the casting too.

Cheers Graham.

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #122 on: December 20, 2018, 11:36:55 AM »
I may drill the inlet hole up at an angle to raise the seat which will also give more length to guide the valve stem as there is not a lot of room under the valve body.

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #123 on: December 22, 2018, 07:35:58 PM »
Got about 8 bits done yesterday and 7 today, just the actual valve of the gas control valve to do and that will be all the bits done from spool down to the inlet. Which should just leave me the hot tube, burner and governor arms/weights left to do. Couple of pics from yesterday.



Revised pivot with a temporary pin



And those that are in the know will know what this is for ;)




Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #124 on: December 26, 2018, 08:05:37 AM »
Gas Plumbing.

Put it at the back of the engine as Graham did where it all gets a bit tight and hard to get to or put it on the right hand side of the engine where runs to a banjo on the governor valve and the ring burner will be quite straightforward and easy to access. Side mounting would also make it easier for anyone wanting to put a front burner on as per patent drawing.

Discuss.


PS Has the elephant man been a naughty boy  as I have not heard of him getting any castings this Christmas :thinking: Arthur was good and got something from ARC's new line of pet products

Offline Alyn Foundry

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Re: The Alyn Foundry IF Allman engine.
« Reply #125 on: December 26, 2018, 11:47:16 AM »
Merry Christmas Jason.

And of course, to all our readership.

I chose to put the gas supply lines at the rear to give the " front " an " uncluttered " feel, however....

In the " olden times" the " front " was considered to be where the power came from and all that lovely looking moving " gubbins " was called the back!!

Ultimately, the choice is yours, yes the area is rather tight but once fitted it should never need to be
" attended " to again.

Cheers Graham.

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #126 on: January 01, 2019, 04:16:15 PM »
Not so much progress on this one over the last few days, but have got the gas valve lever and roller done



Also the governor arms and pivot pins



I have been a bit distracted doing some nice bright and shiny helical machining, can you tell what it is yet ;)




Offline Dave Otto

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Re: The Alyn Foundry IF Allman engine.
« Reply #127 on: January 01, 2019, 04:31:25 PM »
Forest?

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #128 on: January 01, 2019, 04:56:22 PM »
 :)

Offline b.lindsey

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Re: The Alyn Foundry IF Allman engine.
« Reply #129 on: January 01, 2019, 05:01:04 PM »
Arthur is a cutie!!  Would probably prefer a bone though :)

Bill

Offline crueby

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Re: The Alyn Foundry IF Allman engine.
« Reply #130 on: January 01, 2019, 11:40:28 PM »
That helical bit is a large-scale model of a watch screw....   :Lol:

Offline Jasonb

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Re: The Alyn Foundry IF Allman engine.
« Reply #131 on: January 16, 2019, 09:50:39 AM »
Would the two potential other builders of this engine care to comment on the drawings in this thread as you will be working from them, I have already PM'd Graham for his thoughts.

http://www.modelenginemaker.com/index.php/topic,8775.msg192474/topicseen.html#new