Author Topic: Freelance mill engine from Stuart castings.  (Read 25637 times)

Online steam guy willy

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Re: Freelance mill engine from Stuart castings.
« Reply #315 on: September 11, 2018, 10:11:00 PM »
... also a quick question for you Why does heat rise ??


It doesn't, hot air/etc does since it expands, making it lighter per volume than it was.





Hi Chris, yes the term hot air rises is true  and i suppose this is only true for liquids and gasses but not solids !! thinking about what happens in phase changes though ??
thanks

Willy

Offline MJM460

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Re: Freelance mill engine from Stuart castings.
« Reply #316 on: September 12, 2018, 02:47:32 AM »
Hi Willy, I think we have discussed the issue of heat rising before, so clearly we need some more words to convey the particular aspect you are puzzling over.  As Chris says, hot air rises, but it is not accurate to say heat rises.  The fundamental principal is that heat travels from high temperature to low temperature.  Up or down, that is, the effect of gravity is not relevant to heat flow.

You mentioned phase change, so do you mean boiling of a fluid, like water changing to steam?  Rather than hijack your engine thread with one of my normal long winded answers, I will go back and continue the thermodynamics thread, to keep all the similar topics together.

I am glad that you are continuing to get the governor working.  The part that always intrigues me about miniature governors is the friction at the gland of the throttle valve.  It is hard to know how to achieve sufficiently low friction for the tiny forces from the flyweights to operate.  But I am sure you will get there, so following with interest.

MJM460
The more I learn, the more I find that I still have to learn!

Online steam guy willy

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Re: Freelance mill engine from Stuart castings.
« Reply #317 on: September 14, 2018, 02:11:55 AM »
Engine slowly coming together.....ready for Beeleigh...The dynamo is connected up and the governor linkage. the name plate is affixed and the base plate in place so just some oil pots to make and the reversing lever to do !! I will get a really good video made as well with proper lighting and  a diffuser lens as the gloss paint is a bit bright.......

Offline crueby

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Re: Freelance mill engine from Stuart castings.
« Reply #318 on: September 14, 2018, 02:18:23 AM »
Very well done Willy!    :ThumbsUp: :ThumbsUp: :ThumbsUp: :ThumbsUp: :ThumbsUp:

Offline zeeprogrammer

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Re: Freelance mill engine from Stuart castings.
« Reply #319 on: September 14, 2018, 02:27:34 AM »
I will get a really good video made

I'm looking forward to that!!  :ThumbsUp: Worth the wait too.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Online steam guy willy

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Re: Freelance mill engine from Stuart castings.
« Reply #320 on: September 17, 2018, 11:00:57 PM »
  This is the engine running on air at Beeleigh Mill..

Offline crueby

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Re: Freelance mill engine from Stuart castings.
« Reply #321 on: September 17, 2018, 11:06:54 PM »
I love how smooth and stately it runs and sounds, very well done!


 :praise2:

Offline MJM460

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Re: Freelance mill engine from Stuart castings.
« Reply #322 on: September 17, 2018, 11:26:16 PM »
Beautiful, Willy.  Very elegant engine and great to see it running so well.

MJM460
The more I learn, the more I find that I still have to learn!

Offline zeeprogrammer

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Re: Freelance mill engine from Stuart castings.
« Reply #323 on: September 17, 2018, 11:43:14 PM »
 :ThumbsUp:

Beautiful. I really like seeing them run slow.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.