Pennsylvania A3 Switcher (Kozo)

[Krypto]

My only concern with this is it's not an 'engine' per se, so I'm depating on whether to post a build on the site here.  Well, it IS a spring-wound engine though, so maybe that will count?    Maybe I'd be allowed to post it to the Oddball sub-forum?

I would really like to see that build!  Model Engineer magazine has printed clock builds in the past so it sounds in-topic to me.

[paul gough]

A clock qualifies as an engine on a number of counts if the Oxford dictionary is taken as a guide. To paraphrase, it is an instance of ingenuity, a mechanical contrivance, a machine, implement or tool. A clock therefore meets all these descriptors and as such should pass any inquisition into its inclusion on this forum. I for one would be very happy to follow a build especially of a brass skeleton type.
Regards and congratulations in getting over the finishing line with the 0-4-0. Paul Gough.

[Kim]

Thanks, Chris, Krypto, and Paul, on the vote of confidence in the clock is a motor idea! 

I've still got a lot of planning to do before I get started.  Not to mention the backlog of home chores (which I just mentioned anyway!  )

Kim

[cnr6400]

  Congratulations Kim on finishing the 0-4-0. It's been fun to watch the build progress on your fine engine. Great job! 

If you do make a time measurement device as your next project maybe you could call it a 60-60-364 ? 

[crueby]

Years ago I  posted a clock build, labeled as a  'Hravitic Powered Temporal Engine'. A spring one would be a Torsion rather than Gravitic!   

Grrr, that post would have probably made more sense if I had spelled the first Gravitic correctly!   

[Kim]

Congratulations Kim on finishing the 0-4-0. It's been fun to watch the build progress on your fine engine. Great job! 

If you do make a time measurement device as your next project maybe you could call it a 60-60-364 ? 

Years ago I  posted a clock build, labeled as a  'Hravitic Powered Temporal Engine'. A spring one would be a Torsion rather than Gravitic!   

Grrr, that post would have probably made more sense if I had spelled the first Gravitic correctly!   

You guys are just too funny!
Kim

[cnr6400]

Cheers Kim! 

Re the Hravitic clock Chris- I wondered about that - it was the first I'd heard about a bakery in Serbia building a clock...

[crueby]

Cheers Kim! 

Re the Hravitic clock Chris- I wondered about that - it was the first I'd heard about a bakery in Serbia building a clock...

[Minh Thanh]

Thank you Achim, Roger, and Ian! 

I might be wrong but if the bourdon tube expands, ie opens out, under pressure, won't that move the pointer to the left? Or have I missed something?

Interesting question, Ian!

The end of the bourdon tube moves upward and to the right, under pressure.  And as it moves up and to the right, it pulls the link which is connected above the pivot point of the needle.  And the needle moves to the right.

Here you can see that the link connection on the needle is above the pivot point:


And here's a close-up of the link connecting the end of the bourdon tube to the needle.


When pressure is added inside the bourdon tube, it increases the diameter of its curve.  Since the left end is solidly attached to the stem, it doesn't move. But that increase in diameter makes the other end (the end on the right of the stem) move outward and upward just a little bit.  The entire movement isn't much over 1/8".  But it's enough to move the needle quite a bit.  I don't know what the full scale is yet as I haven't tried it with the gauge fully assembled. That may come later today.  We'll see 

Here's a video of the bourdon tube expanding under pressure. Hopefully, you can see what I mean about moving up and to the right a little?
<a href="https://www.youtube.com/watch?v=4zMHMeTXg2M" target="_blank">http://www.youtube.com/watch?v=4zMHMeTXg2M</a>

This has been a very rewarding little project, that's for sure!
Kim

  Make a pressure gauge yourself   

[gerritv]

Stunning build with lots of persistence thrown in. I think the pressure gauge was a fitting final touch.

Gerrit

[Kim]

Thanks Minh and Gerrit!   
Yes, it was a long build and a lot of work fun!  And as much as I enjoyed the journey, I'm pretty excited to be moving on to something new now 

Kim

[Baltic]

Congratulations Kim on a wonderful build, I have been absent for a while, and have caught up with your build log,  Avid hobby machinists will have a great build thread to review.

[Kim]

Congratulations Kim on a wonderful build, I have been absent for a while, and have caught up with your build log,  Avid hobby machinists will have a great build thread to review.

Thank you, Baltic! 
Kim