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Johns 7mm Coach Workbench - Kit Bashing - More Practical Help - Your Model Railway Club
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 Posted: Mon Apr 10th, 2017 07:10 pm
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Brossard
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Alan, based on the demographic poll from a bit ago, I'd say we're all old farts here.

John



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 Posted: Wed Apr 12th, 2017 06:31 pm
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Brossard
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For the last while I've been toiling away on the underframe.  I think it would be correct to say that the Kirk Parts Pack (can't really call it a kit) is an aid to scratchbuilding.  This is what I have been doing.





I had to cut out the floor from black plastic provided.  There spine parts that need to be cut to length.  The bogie bolsters are glued down.  I had previously installed a captive 4BA nut in these to secure the bogies.  The splayed members are cut and glued down.

The dynamo comes in two halves which are glued together.  The pulley is also two halves.  I used Kemilway instructions as a guide to make a dynamo support and adjustment screw.  This was done by scaling the drawing in the instructions and using scrap brass to cobble up a representation of the support.  Copper wire was added.

Vacuum cylinders were mounted on a trunnion made from some 4mm brake etch V hangers.  They were drilled out and 0.032" wire inserted.  The white thing on the cylinder is a connection for the vacuum reservoir which this coach doesn't have.  The cylinders are angled slightly.  I will fit the rod, lever and crank (all made) later.

Footsteps are 5mm wide plastic strip.  I had a lot of trouble getting them straight.  I think they are acceptable now.

Battery boxes are a lot of work.  You only get the front face and have to make up everything else.  Robs pictures of his coach build were very useful.  Note the strap made from brass strip.  I'm not sure whether there were threaded rod supports at the battery box ends, something else to think about.

Still a ways to go with steam pipe and vacuum pipe runs that I'm mulling.  There's the truss too and I'm trying to make turnbuckles for that.

I found some marvellous photos here:

http://www.lnersvrcoachfund.org.uk/general_items.html  under LNER Projects.

If anyone has drawings I'd love to hear from you.

John



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 Posted: Wed Apr 12th, 2017 09:33 pm
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Rob Pulham
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Hi John,
Did your pack not contain the battery boxes themselves - plain panelled front with an open back? all the four coaches that I have played with so far have had them. I just faced the open side with styrene sheet and then added the planked doors to that.

What sort of drawings are you after?



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 Posted: Wed Apr 12th, 2017 09:45 pm
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Brossard
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Hi Rob, glad you called in, I haven't heard from you for a while.  I don't recall seeing anything other than the battery box fronts in the pack of parts.  Not a big problem as you can see.  In the duplicate thread on RMWeb, Mike Trice has provided some very useful pictures that go a long way to answering my questions.

As for drawings, I like the works drawing copies that sometimes appear in books, so that's what I hope for.  I'll take what I can get though.  For clarity we are discussing the Dia 25, ex GER, 52' 6" 7 comp't 3rd.

Cheers

John



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 Posted: Thu Apr 13th, 2017 08:41 am
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Rob Pulham
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Hi John,

I have been away for a few days - By coincidence working on Kirk coaches

I will have a look through to see if I have anything that might help.



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 Posted: Thu Apr 13th, 2017 01:37 pm
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Brossard
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OK Rob, standing by.

John



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 Posted: Fri Apr 14th, 2017 02:44 pm
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Brossard
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Taking a chance on someone calling the men in white coats, I made turnbuckles.  These are a prominent feature of the undeframe truss and are not on the truss moulding.



Credit to Rob for taking an excellent closeup of a turnbuckle in his Kirkby Stephen album.

For those who might be interested:

Start with 2mm plastic rod (I don't know if there is tube), slice off 1mm and 2mm thick pieces - drill it for 0.032".  Start with 0.020" since you have a reasonable chance of getting the hole centered if you start small.  This may take some practice.

Thread some 0.032" wire through a 1mm and 2mm slice and space these at 5mm (I marked a ply offcut).  Attach 0.020" rod to each side of the tubes using liquid solvent.  Tease into position and LEAVE it.  After about two hours attach two more pieces of 0.020" rod and let harden overnight.

When dry, remove the assembly from the brass rod - it will have stuck so hold the brass with pliers and gently twist your turnbuckle until it loosens and slides off.

Trim the excess 0.020" rod and use a sanding stick to shape.

Viola!

John  :pathead



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 Posted: Fri Apr 14th, 2017 03:55 pm
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ZeldaTheSwordsman
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Brossard wrote: Alan, based on the demographic poll from a bit ago, I'd say we're all old farts here.

John
I'm not! I'm 25!
25 and loving how this project is going. Thanks for sharing the turnbuckle-making process, will have to keep that in mind



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 Posted: Fri Apr 14th, 2017 04:16 pm
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Brossard
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Good for you Brendan, see what you've got to look forward to.  :chicken

Great fun this quasi scratch building.

John



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 Posted: Fri Apr 14th, 2017 04:40 pm
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allan downes
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What's a turnbuckle ?

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 Posted: Fri Apr 14th, 2017 04:56 pm
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Brossard
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It's threaded at both ends and used to apply tension to coach trusses.  I'm in the process of installing them and will post a picture.

If you scroll down you'll see the turnbuckle truss:

http://www.lnersvrcoachfund.org.uk/gnr_2701_restoration_2008.html

John




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 Posted: Fri Apr 14th, 2017 06:49 pm
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Rob Pulham
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Superb John,
Much better than my efforts - I tried to use tube and then drill out the cross section to leave the side frames. I wasn't happy with the results.



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 Posted: Fri Apr 14th, 2017 07:41 pm
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Brossard
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There's more than one way to do it Rob.  Paint and weathering covers all sorts of sins.  The best way is for someone else to make them.  Nevertheless it is good to exercise ze leetle grey cells.

John




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 Posted: Fri Apr 14th, 2017 08:28 pm
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Rob Pulham
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Brossard wrote: There's more than one way to do it Rob.  Paint and weathering covers all sorts of sins.  The best way is for someone else to make them.  Nevertheless it is good to exercise ze leetle grey cells.

John



I couldn't agree more,  I am sure that if more people had hobbies there would be less suffering from dementia.



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 Posted: Fri Apr 14th, 2017 08:56 pm
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Proper modelling, John.  :thumbs



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 Posted: Fri Apr 14th, 2017 09:38 pm
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Brossard
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Rob Pulham wrote: Brossard wrote: There's more than one way to do it Rob.  Paint and weathering covers all sorts of sins.  The best way is for someone else to make them.  Nevertheless it is good to exercise ze leetle grey cells.

John



I couldn't agree more,  I am sure that if more people had hobbies there would be less suffering from dementia.

I think you're on to something there Rob.  Keeping the mind active keeps old age at bay.

John



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 Posted: Tue Apr 18th, 2017 06:17 pm
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Brossard
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I'm not really happy with the underframe as it currently stands.  I did some checking and found:

1) the battery boxes are too long (my fault for not checking more carefully) and
2) the distance between queen posts is too short (kits fault)

I've already cut up the battery boxes and made a fresh start on those.

Rob put me onto a range of Gresley castings available from JLTRT so I'm going to try to get some better queen posts.  I also hope to get some better examples of dynamo and brakes.  Waiting for a reply to my email now.

In the meantime I made a start on the bogies for the 3rd brake.

Some time ago (Robs advice here too) I ordered some packs of 3' 7" wheel dia. brake gear details from Parkside.  I shall use those instead of laboriously making them as I did on the first pair of bogies.

I've assembled the basic bogies and had a review of the parts:



I need the clasp brakes from the grey frets and yokes and hangers from the black one.  The rest will go in the spares box.



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 Posted: Tue Apr 18th, 2017 06:31 pm
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Rob Pulham
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Nice Idea John, 
One I will probably make use of myself at some point in the future. I find the Parkside Sprues to be really good value.



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 Posted: Tue Apr 18th, 2017 06:54 pm
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Brossard
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Yes indeed.  I should add that the black sprues are usually ABS for strength while the others are styrene.

John



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 Posted: Wed Apr 19th, 2017 08:34 am
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allan downes
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All magic stuff John but I'll stick to what 's on offer in the red boxes !

Allan

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