By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

The Post Man Cometh.

James Coombes Engine

All Topics | Latest Posts

Search for:  in Thread Title in  
Nick_G11/03/2015 13:01:29
avatar
1808 forum posts
744 photos
Posted by Nick Grant on 10/03/2015 15:03:58:

that shade of red really sets it off

It's Humbrol Crimson No.20 if you are interested.

I wanted something different from Brunswick green. It's a great colour but it seems 95% of Stuart engines get painted with it. laugh

Nick

Nick_G21/03/2015 20:43:44
avatar
1808 forum posts
744 photos

.

Last weekend I started the Y shaped conrod. Did not get as far as I would have liked. But what I did manage to get done I was happy with.

Managed to get a bit more done today and it's progressing. smiley

I first made the center / cross piece of the conrod. (with the center 'beefed' up a bit from the drawing) The ends have to be dropped to 1/4" to locate into the rods risers.

Next was the 2 risers. These are made from 1/2 x 5/16 bar. The center section of each is turned round and then a 'fish belly' taper to each end.

A short video of the interrupted cut can be seen here :- **LINK** (sounds like an old motorboat)

As recommended by the ever informative Jason the holes at each end of the bar was done before the turning.

Then the 'fish bellies' were done with the compound set at 1 degree and blended in with a file and emery paper.

Ends were trimmed to remove the center drill and live center pockets and milled on each side.

A bit of dressing with a file and they are starting to look the part.

I also decided to add a small brass bushing that has the 1/8th hole in to the top.

So just some polishing and the bottom center riser made and I will then be close to blast off. Unless we have a Houston type 'problem'.! sadwink

Nick

Michael Gilligan21/03/2015 20:52:56
avatar
16993 forum posts
754 photos

Looking Good, Nick

MichaelG.

JasonB21/03/2015 21:01:41
avatar
Moderator
19512 forum posts
2131 photos
1 articles

Have you deviated from the drawing re the bottom ends for a good reason or chickened out of making them roundsmile p

Look good all the same and the fish bellies turned out well

J

Nick_G21/03/2015 21:08:23
avatar
1808 forum posts
744 photos
Posted by JasonB on 21/03/2015 21:01:41:

or chickened out of making them roundsmile p

I think Moused out would be a better description. blush indecisionblush

Nick laugh

Michael Gilligan21/03/2015 21:14:52
avatar
16993 forum posts
754 photos

I hadn't even noticed blush

... presumably they should look like the ones pictured here.

MichaelG.

Nick_G21/03/2015 21:30:36
avatar
1808 forum posts
744 photos
Posted by Michael Gilligan on 21/03/2015 21:14:52:

... presumably they should look like the ones pictured here.

MichaelG.

It's an optical illusion.

Mine are right. - Even the drawing is wrong.!!!! devil - angelwinkwinkwink

Nick cheekylaugh

Jeff Dayman21/03/2015 23:37:56
1970 forum posts
45 photos

Great work Nick, well done. JD

JasonB22/03/2015 07:32:55
avatar
Moderator
19512 forum posts
2131 photos
1 articles

Actually thats a nice little feature on the one Michael linked to, the oil cup and through bolt to make it look a bit more like a split bearing with strap, wedge and cotter which would only have been on teh ends where there is rotation, the goint to the cross piece being static

Now if you would like me to tell you how to make ends like this just askdevil

Nick_G22/03/2015 10:19:42
avatar
1808 forum posts
744 photos
Posted by JasonB on 22/03/2015 07:32:55:

That's a very interesting part Jason and beautifully fabricated and constructed. What is it from.?

I would imagine very innovative for its day and you can see how this would have been produced in a Blacksmiths shop of the era.

Nick

JasonB22/03/2015 10:37:46
avatar
Moderator
19512 forum posts
2131 photos
1 articles

Scaled up and fabricated version of Anthony Mounts Benson Engine, few pics here does a similar job to your part but up the other way.

Neil Wyatt22/03/2015 12:02:21
avatar
Moderator
18404 forum posts
718 photos
78 articles

It's looking very good Nick,

> very innovative for its day

Pretty much standard practice, actually.

The challenge is making the narrow key-sots in the rod ends. One trick is to drill the ends hollow so you only have to slot two thin walls, not right through.

Neil

Not quite as pretty as Jason's:

http://www.model-engineer.co.uk/sites/7/images/member_albums/45510/391158.jpg

Here oneI made earlier:

Nick_G29/03/2015 17:22:19
avatar
1808 forum posts
744 photos

.

The conrod Was assembled with loctite and pinned through the joints with silver steel.

Getting serious now! Gaskets were made and the ones for the cylinder ends were assisted with the use of the PCD function of the mill DRO.

The crank pin was made out of EN24 - The last piece.! smiley

Final assembly began. devil yes

.

And here she is. ................. Finito.!!!!!!!! smileylaugh

So that's my first build done. smiley

Need to put it on a nice base and build or buy a boiler so that it is actually a steam engine and not a compressed air engine. wink

What to build next.???? Decisions, decisions, decisions eh.

I would also like to thank the members of this forum that have assisted me in getting this far. Both those that have contributed directly to this thread and other information that I have picked up elsewhere on this site made by others. I would not have been at this stage without you. .......... Cheers guy's.! smiley

Best regards, Nick

JasonB29/03/2015 17:46:02
avatar
Moderator
19512 forum posts
2131 photos
1 articles

Very nicely done Nick, look forward to the video of it running on air.

Nice touch adding the oiler and extended bearing to the big end

Nick_G29/03/2015 18:11:32
avatar
1808 forum posts
744 photos
Posted by JasonB on 29/03/2015 17:46:02:

look forward to the video of it running on air.

Oooops. Forgot to post that bit. blush

Here you go. :- **LINK**

Nick

Neil Wyatt29/03/2015 18:21:24
avatar
Moderator
18404 forum posts
718 photos
78 articles

Lovely job, Nick.

Neil

paul rayner29/03/2015 19:55:21
168 forum posts
46 photos

fantastic job

paul

ChrisH29/03/2015 23:21:02
923 forum posts
30 photos

Just watched the video - booootiful!

Well done Nick, lovely model, you've done yourself proud.

Chris

Michael Gilligan30/03/2015 07:55:32
avatar
16993 forum posts
754 photos

Nick,

Sweet slow-running, on a whiff of Air

= Evidence of a very nice job.

Well done, Sir !!

MichaelG.

GaryM30/03/2015 10:09:24
avatar
314 forum posts
44 photos

Great work Nick. Runs very well. Even though I've not posted much in the last few months, I've been following your build with interest.

Gary

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
emcomachinetools
Eccentric July 5 2018
EngineDIY
ChesterUK
Warco
cowells
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest