Author Topic: CONWAY 0-4-0 3 1/2" GAUGE LOCO  (Read 57465 times)

Offline Steamer5

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #255 on: October 14, 2017, 11:18:28 PM »
Nice save Rich!

Rest looks good too!

Cheers Kerrin
Get excited and make something!

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #256 on: October 15, 2017, 12:20:58 PM »
Hi

Thanks Kerrin  :ThumbsUp:

A quick bit of silver soldering this morning




Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #257 on: October 19, 2017, 06:11:25 PM »
Hi

While the lathe is set up to screw cut 32tpi I have made one of the gland nuts

A bit of 1/2" hex brass turned and screw cut




Part off and try






Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #258 on: October 19, 2017, 06:37:47 PM »
Hi

And again while the lathe is set up for 32tpi I have made some of the bungs I will need when it comes to the hydraulic test. Instead of turning each bung seperately from hex I screw cut a length of 1/4" round brass and cut off 5 short lengths. Drilled and tapped 1/4 x 32 a length of 7/16 brass hex and part off 5 nuts. Screw the short lengths into the nuts and silver solder in.








Cheers

Rich


Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #259 on: October 19, 2017, 06:51:47 PM »
Hi

Back to the boiler. I am going to use 5/32" copper rivets for the stays now that it has been approved by our club boiler inspector.

I had already (correctly) drilled 10 holes in the throat plate. I had already (incorrectly) drilled 10 holes in the firebox plate.
Unfortunately the holes don't line up  :facepalm:
What I should have done is drilled the holes in the throat plate then after assembly, using those holes as a guide drilled through the firebox plate.  :thinking:

First job is to make up a long drill. Drill 5/32" the end of a length of 1/4" steel rod. Insert the shank of the drill and silver solder in.



Then drill through throat plate and firebox plate




Cheers

Rich 

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #260 on: October 19, 2017, 07:05:44 PM »
Hi

Fortunately the holes I drilled previously were only 3/32".

The new holes are drilled 5/32" to take the copper rivets which leaves a 3/32" hole very close to them. I cut off 10 short lengths of 3/32" copper rivets



After a spell in the pickle plenty of flux was applied and a short 3/32" copper rivet placed in each small hole and 5/32" copper rivet pushed right through from the firebox side. I have left the bottom right hand rivets out while I took a photo.



The last 2 rivets were pushed in then silver soldered. After a spell in the pickle it looks ok.



Turn it over and flux the outer ends then silver solder



After another spell in the pickle



Cheers

Rich





Offline crueby

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #261 on: October 19, 2017, 10:19:32 PM »
Clever trick making the extended drill, have to remember that one! 

Offline b.lindsey

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #262 on: October 19, 2017, 11:55:27 PM »
That is so nice silver soldering Rich. Using the extra torches on parts this size must really help also!!  Still following along and enjoying the build.

Bill

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #263 on: November 04, 2017, 09:25:50 PM »
Hi

Thanks Crueby and Bill  :ThumbsUp:

There are 25 stays each side of the firebox. Print out an actual size drawing.



Stick it to the side with masking tape and centre punch the positions. Note that 2 of the stays are slightly lower to leave room for the mounting bracket



Drill the 25 5/32 holes



Lots of flux, push through 25 x 5/32 copper rivets



And silver solder



Turn over and silver solder the outside



Then repeat the process on the other side of the boiler not forgetting that a reverse view of the drawing is needed for the right hand side.

Cheers

Rich



Offline Kim

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #264 on: November 04, 2017, 11:25:10 PM »
Nice work on the firebox Rich.  There' a lot of work in that!
Kim

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #265 on: November 09, 2017, 08:06:57 PM »
Hi

Thanks Kim :ThumbsUp:

Chop off the excess from the stays




A trial fit in the frames



Remove the backhead that was temporarly fitted with screws




A spell in the pickle



At this stage it has to go to the club boiler inspector to be examined while he can see inside it so no more work until it has the ok

Cheers

Rich

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #266 on: November 10, 2017, 09:02:49 PM »
Hi

With work on the boiler on hold until I can get it passed by the inspector I decided to amuse myself with a bit of brass work, the manifold to be precise.

Start by turing a bit of brass 1 1/8" then to 1/2"



Drill through 5/16 then transfer to the rotary table and drill the 4 fixing holes



Back in the lathe to have a chamfer with a large countersink





A trial fit



A bit of 1/2" square brass is drilled but not quite all the way through and tapped 3/16 x 40 for a blanking plug



Cross drill and tap 1/4 x 40 at each end, one for the pressure gauge and on for the blower and on the side face for the whistle valve. In the centre a slight recess is machined with a 1/2" end mill





Set up in the brazing hearth and silver solder the 2 parts together



A bit of screw cutting some hex brass to make a couple of fittings





A trial fit on the boiler




Cheers

Rich


 
« Last Edit: November 10, 2017, 09:05:57 PM by Firebird »

Offline crueby

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #267 on: November 10, 2017, 10:30:05 PM »
Is it just the camera making it look this way, or are the two down-facing nipples on the manifold overlapping the base plate? In the drawings it looks like the threaded portions are farther out, to give room to get the unions in without hitting the base, but on the part it looks like they are too far in? Hope its just a camera illusion, since it is came out looking so good.

Online Jo

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #268 on: November 11, 2017, 08:26:03 AM »
Hi Rich I hate to be a party pooper but I keep reading "Brass" on your boiler fittings :hellno:

Brass has a nasty habit over time of suffering from dezincification and failing when used around steam on boilers :paranoia:

Jo
Usus est optimum magister

Offline Firebird

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Re: CONWAY 0-4-0 3 1/2" GAUGE LOCO
« Reply #269 on: November 11, 2017, 09:16:30 AM »
Hi

Crueby there is room for the connections.

Hi Jo. You are quite right, brass must not be used on any part of the boiler that is a part of the boiler, ie silver soldered to it because of the de zincification problem. All the fittings that are a part of this boiler are either gun metal or Phosphor Bronze.

Anything that screws or bolts in can be made of brass because they are easily replaceable.

Cheers

Rich