Author Topic: Series 24 High Speed vertical  (Read 671 times)

Offline Jasonb

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Series 24 High Speed vertical
« on: April 21, 2018, 08:44:45 PM »
I have been working on this engine on and off for about 8 weeks and got it completed today. My usual 24mm bore and also 24mm stroke that stands about 6.5" tall. I took various features from several other models and also some full size ones to come up with something that was pleasing to the eye and not too difficult to fabricate or cut from solid.

It's got a bit of a knock from a slightly loose crosshead pin that needs attending to which is amplified by the bench but apart from that runs quite nicely. My compressor has a small 12 lts tank and it will run for just over 9mins with the regulator set at 10psi before the tank is empty, less if I rev the life out of it ;)







And a bit of video, you can hear how the knock gets quieter as I lift the engine to move it about, flywheel looks to be on fairly straight too :LittleDevil:


Online Gas_mantle

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Re: Series 24 High Speed vertical
« Reply #1 on: April 21, 2018, 08:52:25 PM »
Looks great  :)

Like a small barstock Stuart no1.

Online b.lindsey

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Re: Series 24 High Speed vertical
« Reply #2 on: April 21, 2018, 09:12:39 PM »
A nice addition to the collection Jason. I like the cantilevered cylinder and one sided support for the crosshead too.

Bill

Offline vcutajar

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Re: Series 24 High Speed vertical
« Reply #3 on: April 21, 2018, 09:23:03 PM »
Nice one Jason.  Why is it called series 24?  Is it because of the bore and stroke?

Vince

Offline Dave Otto

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Re: Series 24 High Speed vertical
« Reply #4 on: April 21, 2018, 09:54:00 PM »
Nice engine Jason :ThumbsUp:

Dave

Offline tangler

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Re: Series 24 High Speed vertical
« Reply #5 on: April 21, 2018, 10:14:06 PM »
Very smart.

Rod

Offline zeeprogrammer

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Re: Series 24 High Speed vertical
« Reply #6 on: April 21, 2018, 10:16:21 PM »
That's a beauty.
Several pretty cool features.  :ThumbsUp:
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Offline steamer

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Re: Series 24 High Speed vertical
« Reply #7 on: April 21, 2018, 10:30:05 PM »
Nice looking engine Jason!   

Dave
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Online Kim

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Re: Series 24 High Speed vertical
« Reply #8 on: April 21, 2018, 11:40:22 PM »
That's really nice Jason!  Is this one of your own design?  Part of your "Series 24" engines?  In any case, I really like it and it seems to run quite well.
Kim

Offline Jasonb

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Re: Series 24 High Speed vertical
« Reply #9 on: April 22, 2018, 07:12:25 AM »
Thanks for the comments chaps

Vince, I have done several with 24mm bores and this is the latest one, stroke does vary.

Kim, yes it is one I drew up to go with the other 24mm bore engines. I took features from quite a few sources rather than just redrawing a particular engine. The sole plate with it's square oil cups comes from an etching of a German engine(attached), This is made from aluminium screwed & JBWelded together. The straighter design of the standard is more like a Bolton and the 1924 compound engine and is of silver soldered steel construction, cylinder support Stuart/Bolton cut from aluminium and the cylinder could be from just about anything which was silver soldered from bronze & brass.

This test run will give a better idea of how it's been put together.





Offline warrenmaker

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Re: Series 24 High Speed vertical
« Reply #10 on: May 15, 2018, 10:44:40 AM »
Hi Jason,
that's a magnificent engine.
May I ask how you made the cylinder? After I finish my Stuart #7A I woould likt to attempt building one from scratch like yours.
 Any help would be appreciated. Thanks   :help: :D

Offline Jasonb

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Re: Series 24 High Speed vertical
« Reply #11 on: May 15, 2018, 01:37:36 PM »
Off back out to work now but will reply later.

Online Gas_mantle

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Re: Series 24 High Speed vertical
« Reply #12 on: May 15, 2018, 05:23:41 PM »
Having had a further look at this engine I now wish I'd made a combined box bed / sole plate from multiple parts as you have done.

I'm part way through cutting a Stuart no4 soleplate from a piece of solid cast iron and I'm finding there is a lot of material to remove and more to the job than I expected. I'll have to look at fabricating the box bed from component parts.

Offline Jasonb

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Re: Series 24 High Speed vertical
« Reply #13 on: May 15, 2018, 06:53:35 PM »
On this engine I went for a silver soldered bronze/brass fabrication for the cylinder though it could also be done fairly easily from a solid piece of cast iron or even bonded together with JBWeld if you did not feel upto soldering.

The cylinder consists of a "cylinder" cut from hollow bronze bar bored under size and with a spigot each end.



Two discs of brass fit onto these spigots, these can be cut from round bar or as I had quite a bit of brass flat I used that. Again made slightly over thickness.



The last part is a block of bronze flycut to overall size but left a bit thick, curves added with a boring head and the passages milled in.





After waving the magic torch at the parts you have a basic cylinder "casting" that can then be bored to finish size, have the flanges machined to thickness and the port face cut followed by milling the ports and drilling & tapping some holes.





The two other parts that need fabricating are the bed plate which as Peter ha smentioned is screwed and JBWelded together from 4 bits of aluminium as it's easy to machine.



And the column which is a bit of 10mm flat bar with 3 thinner bits of flat stock silver soldered on though these could probably be done with CSK screws and JBWeld. Once soldered all the critical faces can be machined at one setting which makes sure the top and bottom are at 90deg to the cross head guide.



This is the basic "naked" engine.


Online crueby

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Re: Series 24 High Speed vertical
« Reply #14 on: May 15, 2018, 07:00:20 PM »
Neat way to piece up the cylinder!    :popcorn: