Author Topic: CONWAY 0-4-0 3 1/2" GAUGE LOCO  (Read 60616 times)

Offline Jasonb

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #15 on: December 30, 2016, 04:05:45 PM »
Hopefully the proper drawings will have any revisions of items that were wrong in the articles such as the boiler drawing having the barrel 1/4" too short on the magazine drawing

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #16 on: December 30, 2016, 02:20:09 PM »
Hi

Thats right jason. Hopefully I have cut the boiler to right length of 14 3/16 if not I have just *+*$=>@ an expensive piece of copper tube :'( :rant: :Mad: :cussing: :wallbang:

Cheers

Rich

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #17 on: December 30, 2016, 04:47:28 PM »
Don't expect the drawings to have been corrected if they found any mistakes :ShakeHead: This is a Martin Error's design.

I tried to find Alan Stepney's old webpage as he had been collecting "features" on locomotive and model drawings but someone has brought out his URL and it is no longer available  :wallbang:

Jo
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Offline Jasonb

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #18 on: December 30, 2016, 06:55:20 PM »
That is why I said the drawings will hopefully have been corrected.

Alan Stepney's site has been down for over a year now which is a pitty as it was the first place to go looking. A google for "Conway drawing errors" brings up a few hits mostly on ME forum

I thought it was supposed to be 14 1/4"?

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #19 on: December 30, 2016, 07:02:37 PM »
So nothing to worry about the missing 1/16" can be lost in the overlap on the back of the smokebox if it proves to be a bit short :)

Jo
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Offline Jasonb

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #20 on: December 30, 2016, 07:08:57 PM »
Text said the error could not be taken out by playing with the smokebox as it created other issues but that was the full 1/4" error so may not hold true for 1/16"

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #21 on: December 30, 2016, 07:14:20 PM »
14 1/4" - 14 3/16" = 1/16"   :noidea:

Too short can be fixed by making the smokebox longer (it is not a scale loco) too long and you cut a bit more off  ::)

Edit: Taken from the Conway article page 1499: The length of the boiler barrel must be 14 1/4", not the 14" as on the drawing  :ShakeHead: page 1130/1. This means that the smokebox tube plate is set in 1 1/2" from the outer end of the barrel, not 1 1/4" so that the lengths of the tubes and flues are unaltered. This is important as if the barrel is made only 14 " long, the throat plate would foul the rear coupled wheels, unless the smokebox was pushed further to the rear or made 1/4" longer and that would require further changes.

Jo
« Last Edit: December 30, 2016, 07:22:17 PM by Jo »
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Offline mikemill

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #22 on: December 30, 2016, 07:56:27 PM »
Rich
Regarding your steam header bush design, most people these days use O rings to seal the pipe to the header, see here

http://modeleng.proboards.com/thread/9244/smokebox-regulator-steam-pipe-fixing

O rings were not around when these engines were designed!

Mike 

Offline Jasonb

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #23 on: December 30, 2016, 08:29:22 PM »
14 1/4" - 14 3/16" = 1/16"   :noidea:

Too short can be fixed by making the smokebox longer (it is not a scale loco) too long and you cut a bit more off  ::)

This is important as if the barrel is made only 14 " long, the throat plate would foul the rear coupled wheels, unless the smokebox was pushed further to the rear or made 1/4" longer and that would require further changes.

Jo

Thats what I said that having to stretch the smokebox will create other issues or as ME put it "require further changes"

Question is why did Rich make it 14 3/16" and not 14 1/4"

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #24 on: December 30, 2016, 08:43:58 PM »
I've found a quote in the article that mentions 14 3/16" a page over from the boiler drawing ::)

Rick nothing lost so far as you can extend it by modifying the smokebox to boiler adapter as shown  ;)

Jo
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Online Admiral_dk

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #25 on: December 30, 2016, 07:09:20 PM »
Quote
I tried to find Alan Stepney's old webpage as he had been collecting "features" on locomotive and model drawings but someone has brought out his URL and it is no longer available  :wallbang:

Jo Ty this one or it's similar siblings https://archive.org/web/

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #26 on: December 30, 2016, 09:16:13 PM »
Thanks Per, found it, looks like I need to copy those, I am sure Alan would want them to be available  :)

https://web.archive.org/web/20080821135852/http://www.alanstepney.info/page43.html

Looks like the length of the boiler tube is the only recognised "feature" and if it is 14 3/16" it is recoverable  8)

Jo
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Offline Jasonb

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #27 on: December 30, 2016, 10:30:56 PM »
Looks like the length of the boiler tube is the only recognised "feature"

And a few more

"I am using an earlyish set of drawings and the ME articles. I have found that, due to increase boiler length, the back of the ashpan hits the derailment angle at the back of the frames. I will move it back. The brake rods run INSIDE the frames. The ashpan side tubes are the inner width of the frames. Drop the aspan and it hits the brake rods! Martin Evans drawing shows two brake cross members, I found, after making them, they are not necessary, the brakes are not connected side to side. Two brake rod couplings are drawn by M.Evans., a further two are required ( but with only one rod connection) for the front brake."

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #28 on: December 31, 2016, 12:17:03 AM »
Hi

Oh boy oh boy oh boy

Am I glad I am a member of this forum :ThumbsUp: :whoohoo:

If I ever get this thing up and running you are all welcome to come and play choo choo's :lolb:

Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #29 on: January 01, 2017, 07:07:56 PM »
Hi

I have ordered a set of plans from Reeves. They stock most of the castings etc for this engine so I figure their parts will suit their plans, hmmmmm or not we'll see

Made a couple of bits that don't require a lot of explanation.

A round frame stretcher



A straight forward turning job. The plans specify bright mild steel and BA threads. I have used a bit of stainless steel because it was the only bit of 3/8" I had and tapped 4mm.

The other strethcher similarly I have used slightly differnt materials to those specified but I can't see a problem. Specified is 1/8" steel plate but I have used 3mm, only .008" thinner and I had to make a bit of angle by machining down a bit of brass angle. At the moment it is all held together with 2.5mm stainless steel cap heads instead of rivets. If they don't get in the way I'll leave them in.









Cheers

Rich
« Last Edit: January 01, 2017, 11:46:13 PM by Firebird »