A screw coupling option...

A screw coupling option...

Postby iak » Thu Apr 07, 2011 10:10 am

Screw couplings are a minefield for the modeller, or they can be if your of the finescale mentality...
My take on the subject is to use a mix of Exactoscale coupling hooks and a Masokits etch for screw couplings.
The below images show the finished article on a BR Dia. 1/208 van.

Image

Image

Image

I hope to do some images showing how to assemble these wee blighter's so stay tuned grapple fans ;)
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Davef » Thu Apr 07, 2011 10:34 am

Now they're ma buffers... OK! ;)

Dave.
http://www.lanarkshiremodels.com
Last edited by Davef on Thu Apr 07, 2011 11:34 am, edited 1 time in total.
Davef
 
Posts: 139
Joined: Mon Dec 06, 2010 10:45 am

Re: A screw coupling option...

Postby iak » Thu Apr 07, 2011 10:40 am

:lol: :lol: :lol:
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby trebor » Fri Apr 08, 2011 3:53 pm

Davef wrote:Now they're ma buffers... OK! ;)

Dave.
http://www.lanarkshiremodels.com


And really nice looking castings they are too, do they come as a sprung version, or is it out with the drills.

regards
trebor
trebor
 
Posts: 7
Joined: Fri Jan 28, 2011 1:36 pm

Re: A screw coupling option...

Postby Richard Oldfield » Tue Apr 12, 2011 11:24 am

trebor wrote:
Davef wrote:Now they're ma buffers... OK! ;)

Dave.
http://www.lanarkshiremodels.com


And really nice looking castings they are too, do they come as a sprung version, or is it out with the drills.

regards
trebor


Hi trebor,

So far the LMS range of buffers are all cast solid - which suits me fine - but I'm sure Dave could be persuaded to do sprung versions if there was enough interest. Speaking to Dave at the weekend he seems to have a long list of future projects including some Oleo hydraulic buffers which we eagerly await.

Cheers,

Richard
Richard Oldfield
 
Posts: 1202
Joined: Mon Mar 01, 2010 8:08 pm
Location: Bidston near Birkenhead

Re: A screw coupling option...

Postby iak » Mon Apr 18, 2011 12:53 pm

So, as promised, here is a wee illustrated protocol for how I sort screw couplings.

Image

Here is the Masokits etch - it looks worse than it is to work worth once one is used to it.
You also get some etched hooks and instanters. I prefer to use Exactoscale coupling hooks however.

Image

Here you see the couplings central assembly.
Drill out to holes, if needed, whilst still on the main etch.
The black rod is 0.7mm pencil lead, you use this to keep the holes aligned once you fold the etch over.
You want a snug fit to keep it all square once its soldered up.

Image

Once you have the soldering done, remove the pencil lead and take a jewellers broach to the holes - carefully!

Image

Adding the links involves some careful bending up, using 3/64 rod as a former.
It also pays to clean up things with a file atr this point.
The links are attached using 0.65mm craft pins - Mike Clark {Mr Masokits] uses 0.7mm but hey...
The extra 0.05mm will help things to be free but naer to loose and floppy.
Carefully shallow/thin of the head of the pin by the way - it looks better.

Image

This is the tricky bit.
The paper/tape allows one to solder the pin in place, without it gumming up the blasted thing; well that it the theory :lol:

Image

Hark, it looks like a coupling.
Now to clean it up....

Image

Ahem.... NEXT!

Image

The solution is 0.5% - 1.0% Neutracon as mentioned elsewhere by myself.
It cleans up all the flux and gunk, leaving a very nice clean piece of work.

Image

Attaching the coupling to the coupling hook will mean the jewellers broaches come out again.
Care here as you want to fit the coupling in and then close enough metal behind it to hold it in place - don't make the hole too big!
The plates on the stem of the coupling hook are Ambis etches by the way.

Image

Image

Image

The finished articles in place.
Some use araldite but I use Rocket Max super-glue.
The plastic gets "keyed" using Ambroid Pro Weld before hand by the way which seems to help.

I hope this all makes sense and any questions? Ask away.



This wae braawt tae ye by biccie power
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Cock Sparra » Tue Apr 19, 2011 10:00 am

Looks like the dogs proverbials to me. :D
Cheers Phil

I used to be normal but I'm better now
Cock Sparra
 
Posts: 327
Joined: Fri Oct 16, 2009 2:36 pm
Location: SUNNY DEVON?

Re: A screw coupling option...

Postby John B » Tue Apr 19, 2011 3:08 pm

Great stuff, Iain - this sort of "how I did it" piece is just what Fred needs and is all about.

Many thanks for sharing!
John Bardwell
Modelling whatever takes my fancy, whenever I get the chance..
User avatar
John B
 
Posts: 275
Joined: Sun Aug 09, 2009 3:52 pm
Location: Oceanside, CA & Boston area, MA

Re: A screw coupling option...

Postby iak » Wed Apr 20, 2011 8:08 am

Cheers Gents..
And more will no doubt appear frae Stalag Barrowmore soon :lol:
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Davidb » Tue Nov 29, 2011 9:53 am

Just got round to screw couplings and this was very useful. Thanks, Iak. Having made up a Masokit hook, like you, I think I'll use Exactoscale hooks. However, can someone tell me when one uses two short or one short & one long shackle?

I reamed out the holes whilst everything was still on the fret to make 0.5mm lace pins a snug fit (file the heads down to almost nothing). I also found it easier to thread the bits on to the pin and just solder them without the paper, using a pointed iron bit, small drop of flux (I apply it with a syringe where I have squared off the end of the needle) & even smaller amount of solder. The links are quite free if you use minimal solder and remove the iron almost before you apply it.

These are, as Michael Clarke says, very fiddly, but the result is worthwhile. However, if you can make the screw couplings, try Southwark Bridge bikes & barrows - hone your soldering skills!

David

barrow & bike_4056.jpg
You do not have the required permissions to view the files attached to this post.
Davidb
 
Posts: 46
Joined: Mon Dec 27, 2010 8:30 pm

Re: A screw coupling option...

Postby iak » Tue Nov 29, 2011 10:15 am

The short shackle I think is the scale one and the long one is for those with dodgy eyes and wobbly hands...
Maybe not strictly correct but hey...
Glad this helps mon - Mr Clark stuff does need thought but one cracked its easy.
Do like those Southwark bits, especially that barrow. 8-)
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Davidb » Wed Nov 30, 2011 5:02 pm

Thanks, Iak, but I noticed some prototypes (Google image search) have the long shackle attached to the hook. I wondered if this was a later BR thing, different between the Big Four or even a difference between pre-group companies. I couldn't tell from the images as few included enough of the loco or vehicle to know what it was. Indeed, has the long shackle always been used or was it introduced in 19xx?

I am curious as the Masokits etch includes two short and one long shackle for each coupling. Does anyone know the answer?

David
Davidb
 
Posts: 46
Joined: Mon Dec 27, 2010 8:30 pm

Re: A screw coupling option...

Postby steve1 » Wed Nov 30, 2011 8:07 pm

It's also solved my search for coupler plates too! I've been searching all over and hadn't got to Ambis yet. (It wasn't an alphabetical search...)

Thanks!

steve
Steve Grantham
East Riding Finescale Group
General Assistance Dept.
DEMU, EMGS
steve1
 
Posts: 221
Joined: Sun Aug 23, 2009 7:55 pm

Re: A screw coupling option...

Postby Richard Oldfield » Thu Dec 01, 2011 12:51 am

Hi Davidb,

I checked one of the BR official manuals dated mid 1970s. For BR standard screw couplings there is one longer shackle and one shorter shackle. The longer shackle has a 'gedge flat' which allows it to be attached to the drawhook via the 'gedge slot' - in other words the longer shackle is nearest the drawhook of the wagon it belongs to.

The following standard measurements are from the centre of the trunnion to the inside of the 'D' of the shackle:-

Freight stock - 13.125"(long) and 9.125"(short)

Coaching stock - 14.125"(long) and 10.125"(short)

I suspect that the choice of shackles for modelling purposes is more determined by minimum radius, the choice of sprung or unsprung buffers and buffer length. I choose the shortest combination which avoids buffer locking on our tightest radius curve (= 1200mm).

Hope this helps.

Cheers,

Richard
Richard Oldfield
 
Posts: 1202
Joined: Mon Mar 01, 2010 8:08 pm
Location: Bidston near Birkenhead

Re: A screw coupling option...

Postby mike41a » Sun Apr 22, 2012 9:31 pm

Having being castigated by the boss this afternoon at Wakefield for not posting I thought I'd break this years duck, although it involves nitpicking/fault finding, so maybe you'll show me the red card :oops:

Whilst IAK's build of the Masokits couplings is in line broadly with my modus operandi, he's actually missed a step out the end of the sequence, viz, the weight on the end of the tommy bar is one of (at least) 3 different styles, none of which is the same thickness as the bar, to replicate this I drop a blob of solder on the end and file to shape.

Sorry chaps. (It's the pressure of only being a mere EM modeller in the hallowed surroundings of Scaleforum!)

Mike.
mike41a
 
Posts: 6
Joined: Sun Jan 09, 2011 9:57 am

Re: A screw coupling option...

Postby iak » Mon Apr 23, 2012 8:56 am

:lol: :lol: :lol:
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Waveydavey » Mon Aug 19, 2013 2:51 pm

iak wrote:Attaching the coupling to the coupling hook will mean the jewellers broaches come out again.
Care here as you want to fit the coupling in and then close enough metal behind it to hold it in place - don't make the hole too big!


Can you give a bit more detail on how you do this Iain. I'm not sure I follow.

Cheers

David
Modelling Clackmannanshire Railways in 1975
http://waveydaveysmodelmuddle.wordpress.com/
Waveydavey
 
Posts: 62
Joined: Mon Aug 17, 2009 9:36 am
Location: Under The Ochils Back In '75

Re: A screw coupling option...

Postby iak » Mon Aug 19, 2013 10:08 pm

Hallo David
Essentially one needs to open the hole in the top of the Exactoscale hook enough to let it hang free, with enough metal left to close over and hold the coupling in place...
Does that help any? :scratch
Perfection is impossible.
But I may choose to serve perfection....
Robert Fripp


The only person who doesn't make mistakes is God and since he does not exist....


https://www.facebook.com/groups/PadgateWorks/
iak
 
Posts: 753
Joined: Thu Aug 27, 2009 11:34 am
Location: PADGATE WORKS IN DARKEST NORTH CHESHIRE...

Re: A screw coupling option...

Postby Davidb » Sun Aug 25, 2013 9:07 pm

I make the same screw couplings but don't open out the slot on the hook. I pinch the top link half way down one side with a pair of round-nosed pliers to make it a little bit thinner. I can then slip the link into the slot in the coupling hook. This is the same as a kedge on a full sized 3-link coupling.

David
Davidb
 
Posts: 46
Joined: Mon Dec 27, 2010 8:30 pm


Return to FRMW Clinics

Who is online

Users browsing this forum: No registered users and 1 guest

cron