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Tain North Signal Box - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Mon May 5th, 2008 08:16 am
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Perry
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Wayne Williams wrote:..........Just a thought, they make rubber material that can be used as moulds, could you like, make one super looking chair and then make a mould of it to make many more?

Wayne


Unfortunately, what you suggest is unlikely to be practical, Wayne - which is a great pity because there must be tens of thousands of small items that we could use such a process for.

The reason it would be impratical as that a nice little little chair like Darren built has too many undercuts in it's design to allow it to be removed from a mould in one piece. It would be incredible fragile too, and just flexing the mould to try to extract it would cause many breakages. The only solution would be to make it in several different pieces, then glue them all together. One is then getting into the realms of manufacturing kits though!

One could do it for things shaped like milk churns, for example, but complex shapes are not easy to mould. It would be cheaper and quicker to buy them ready made, or scratchbuild the few items you need as Darren has done so beautifully.

In a previous life I worked for a firm that produced injection moulded objects, and the work that went into designing and making the moulds has to be seen to be believed. :shock:

Sorry for hijacking your thread, Darren. I am following your work closely and am very impressed with your results. Keep up the good work.

Perry



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 Posted: Sat May 10th, 2008 12:40 pm
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Wayne Williams
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Perry,
Could you not add some glass fibers to what ever material you are moulding with to strengthen the component? I used to do that all the time (larger scale though) and you can barely even break the resin, it just flexes thanks to the fiber reinforcements. Just a thought, since it does take so much time to model those "Little Things", right Darren?

Granted you do have lots of undercuts (die locks), but with a rubber mould wouldn't that be forgiving enough to release the part?

I have never used flexible moulds before, alway split the mould to get around the die locks, but splitting the mould on such a little item is out of the question I believe.

Wayne



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 Posted: Sun May 11th, 2008 12:22 am
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darrenscots
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Fabricated the clock (as per the method for the railway station) and made a start on the signal lever frame (after much sanding) today.





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 Posted: Sun May 11th, 2008 12:26 am
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darrenscots
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I have completed putting in the twenty raised slots - the chopper came in handy here - casting that unit may be a viable given Perry & Wayne's comments above!? (However i will fabricate one again for the south box....)

I have shown a trial fit in the box below. I am going back now to fabricate the twenty levers.




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 Posted: Sun May 11th, 2008 07:57 am
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Sol
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Darren, while you are making those, I wil take 4 please:- 2 x 20 frames. 1 x ten & 1 x fifteen :lol:

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 Posted: Sun May 11th, 2008 10:50 am
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Robert
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Meticulous work Darren, excellent.



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 Posted: Sun May 11th, 2008 11:01 am
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georgejacksongenius
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Darren,
The skill you exhibit in this thread is beyond question,but what really blows me away is your patience,and the pains you take on the smallest details.
when this signalbox is finished,I have no doubts that it will look absolutely amazing.Top job,sir!!! :) :wink:

cheers,John.B.

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 Posted: Sun May 11th, 2008 08:00 pm
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Petermac
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Excellent work there Darren - it's going to be a stunning signal box when it's finished. :wink:

Petermac



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 Posted: Sun May 11th, 2008 09:22 pm
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darrenscots
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Thanks everyone for the positive encouragement. Today I cut a hole in the floor and set the frame inside it, added the timber kickplate at the front and completed the instrument shelf (see trial fit in pic below). I fabricated the levers last night and did the first paint of the top half of the levers for the the handles and release (in grey rather than silver) this morning - see the pic of my lever "farm" to hold them during assembly and paint.





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 Posted: Sun May 11th, 2008 09:25 pm
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Robert
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My word, they certainly look the part. Brilliant.



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 Posted: Sun May 11th, 2008 10:15 pm
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owen69
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that is going to need a good signal man to operate it.
you have more patience than i sir.
:roll: :o :lol: :lol: 8)

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 Posted: Mon May 12th, 2008 02:17 am
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Marty
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Brilliant, love the farm, do I order seed from you :shock: :lol: :lol: :lol:



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 Posted: Mon May 12th, 2008 03:35 am
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phill
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Stunning mate stunning. You have the patience of a Saint, unlike me.
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 Posted: Mon May 12th, 2008 11:09 am
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Les
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We've seen some great scratchbuilding on this forum and this is well up there with the very best. A pleasure to behold. :D

Les



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 Posted: Wed May 14th, 2008 12:24 pm
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Wayne Williams
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Darren, now that's what I call "Detail". I know how difficult it is to make parallel grooves like that. Sure is looking the part.
I always found that it is harder to do the second one than the first one. Maybe because my patience ran out! :shock: :roll: :lol:

Keep it up,
Wayne



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 Posted: Sat May 17th, 2008 08:27 pm
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darrenscots
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I have completed the painting of the levers, installed them into the frame and commenced painting the floor and lever frame.

I have also completed the indicator boxes (each is made up of 5 pieces - a bit tiring and fiddly to make up each of them but i think the effort will be worth it once i paint) and the bells (HO scale loco "gong" bells whitemetal castings plus a square of styrene below - if i could have found some suitable buttons or something similar lying round the house I would have used those instead!!) - they are all shown temporarily on the shelf as a trial fit (some final fettling/sanding to go before paint).



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 Posted: Sat May 17th, 2008 08:30 pm
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Robert
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I admire the attention to detail Darren and the patience that goes with it. Great.



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 Posted: Sun May 18th, 2008 12:38 am
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darrenscots
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I generated the Tain North signal box diagram on ms excel (see 1st pic) and printed it out to card and created a styrene frame for it (see 2nd pic). When it prints out at 15% scale it reduces some of the items such that they dont print (even at super resolution print) - eg text noting "signal box", "goods yard" etc





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 Posted: Sun May 18th, 2008 02:28 am
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Sol
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Darren, the problem with your signal box diagram is that you are looking at it with big eyes - if they were 4mm people, they will see it OK :!:

When it is installed in the box with all of the remaining details it will look very good.

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 Posted: Sun May 18th, 2008 05:05 am
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darrenscots
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Sol wrote:Darren, the problem with your signal box diagram is that you are looking at it with big eyes - if they were 4mm people, they will see it OK :!:

When it is installed in the box with all of the remaining details it will look very good.


Ron, your right of course - i just love the miniaturisation aspect. At least i have satisfaction that I have pushed it as far as possible.

This evening i bashed on with the interior walls - when i started out some months ago i had not intended to detail the box inside but as i have gone on I decided i would but couldnt just paint the unfinished reverse of the wills timber board sheet - i used HO scale rail car siding to complete (three pieces have been cut out and are shown loose at the bottom of the pic)



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