Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: Jim on February 06, 2025, 06:58:30 pm

Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Raphael on February 15, 2025, 03:46:05 am
Bonjour

M30 and M31 :
https://youtu.be/GonRRZah_OM
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Jim on February 07, 2025, 07:23:31 pm
Thanks one and all.....appreciate the replies as always.
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Timvrip on February 07, 2025, 02:42:51 pm
That little thing really screams! Very nice.

Tim
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Raphael on February 07, 2025, 01:09:18 pm
Bonjour,

The M30, also very nice machine to my opinion, has a great advantage compared to the M31, it has no dead points:
https://youtu.be/NDDoZdUhszY
Operates at a few PSI.
My lonely small concern would be the size of the flywheel, quite large to be installed in a hull.

And if you know French steam designers, André LECOMTE created his famous AL5 a few decades ago:
https://youtu.be/uvQkwkPFGTs
A little family resemblance?
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Stoker on February 07, 2025, 11:12:43 am
Yes Jim, those M31 verticals are truly fine engines, while the M30 twins may be even better. Can occasionally be gotten at almost embarrassingly cheap prices, though I don't see the low listing prices much anymore like I used to see.

I think mine would definitely benefit from a softer governor spring, and most certainly would run better with a load, which I think one of your beautiful Baker Fans would be perfect for that task!
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: RedRyder on February 07, 2025, 08:51:11 am
Hi Jim, That looks like a marvelous little engine!

It runs great, looks great, and you have a very robust boiler!

and....

It's nice to see your face on the embed image!  

Looking good, my friend!

Gil
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Steamloco on February 07, 2025, 08:21:26 am
Very nice engine plant! Should have no problem running a Baker fan.
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Jim on February 06, 2025, 08:46:27 pm
A marvelous plant Jim, I loved the column of steam coming up from your chuff pot. Stunning job of it mate 😊

Thanks Bruce, its a really nice engine.
After its run in I'm looking forward to seeing how slow it will run and what its like running a Baker Fan.
Title: Re: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: St Paul Steam on February 06, 2025, 07:07:18 pm
A marvelous plant Jim, I loved the column of steam coming up from your chuff pot. Stunning job of it mate 😊
Title: OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder with DIY Modifications
Post by: Jim on February 06, 2025, 06:58:30 pm
OKMO Microcosm Model M31 Vertical Steam Engine Single Cylinder

First run on live steam of this beautiful brass casted vertical steam engine. Really happy with DIY Modifications that I did and the two timber plinths. Made lots of items using my metal lathe and milling machine. The condenser pot was made using three copper plumbing items cut down on the bandsaw, turned on the lathe and drilling and tapping on the milling machine. The inline lubricator needed a complete rebuild and needed to be silver brazed back together. Not sure if the lubricator was made by Stuarts in the U.K or not, I made a new screw top for it and knurled it and put an Australian Miniature Steam Models MSM turn wheel on.

https://youtu.be/lH-C38v6_1s