Jump to content
 

CR Grampian corridor stock , part 5, running trial

Dave John

Entry posted by Dave John in General

1,229 views

 Share

A bit of progress. Four bodies are now on frames and I have been playing on the layout to iron out any running issues.

 

I wanted to try and get it to look as if the coaches are properly coupled. Even with springs I found that screw couplings didn’t really keep the buffers together on curves, and I wanted the buffers to compress to take up and rattle.

 

I came up with this. Essentially half an aj on a diamond spring it is stiffer then the buffer springs but can be extended to couple the coaches. Making it bogie pivot to bogie pivot also gets round the tendency for a screw coupling to be very tight at an angle when the coaches enter a curve or on reverse curves. It is also reversible, coaches can be turned round. 

 

 

 

956375712_gcs54.JPG.d38ea5a1a0c1749fac8603c623c0b147.JPG

 

 

A lot of time has been spent messing about with corridor connections. Tried all sorts including magnets but none got round the problem of getting the faces of the corridor connections to actually line up particularly on a reverse curve or the side forces on the ends of the coach caused running issues.

 

 

Well, I was watching a bit of real train video and it dawned on me. What the eye notices is the faces of corridor connections, not the part where they meet the coach. Conveniently the end of the coach has a slot in it, actually the window of the corridor connection internal door.

 

A bit more lateral thinking. Three bits of foam, medium stiffness but fairly flexible. This is just a proof of concept, needs some rework to tidy it all up.

 

617165857_gcs53.JPG.61c3e40fbaf31c21842a08b050a12837.JPG

 

 

 

So thats how they sit between coaches, and how they sit on a curve.

 

 

1069140902_gcs52.JPG.eb6f8f815d40271d60e89c0b8abffcd1.JPG

 

 

 

 

 

1862013454_GCS51.JPG.b0c238009e481b3bbc2beaa2de1d1a4a.JPG

 

 

 

 

A bit of a heath robinson solution perhaps, but does it work when a train is running on the layout ?

 

A bit of rough video, comments welcome. The big pug stretching its legs.

 

 

 

 

 

I think that gives me the confidence to move on to the next stage, paintwork and interior details.

 

Er , how many antimacassars ?

 

 

 

 

Edited by Dave John
pics replaced

  • Like 18
  • Craftsmanship/clever 14
 Share

13 Comments

Recommended Comments

  • RMweb Premium
Compound2632
  • RMweb Premium

That moves beautifully - as a single unit, as it should. 

 

There should be more antimacassars than macassars, allowing for pair annihilation.

  • Agree 1
  • Thanks 1
Link to comment
  • RMweb Gold
Regularity
  • RMweb Gold

What about uncle macassars? Didn’t everyone grow up with an uncle Macassar, who hid behind the sofa, waiting to jump out?

 

  • Thanks 1
Link to comment
kitpw

The "double diamond" works wonders (now where have I heard that before?) - a clever piece of engineering for sure and it clearly works:  an impressive rake of corridor (properly) connected coaches!

 

Kit PW

  • Thanks 1
Link to comment
  • RMweb Gold
Regularity
  • RMweb Gold
7 hours ago, kitpw said:

"double diamond" works wonders (now where have I heard that before?)

Burton-on-Trent, I guess, but shome yearsh ago, shurely?

  • Funny 1
Link to comment
kitpw
38 minutes ago, Regularity said:

Burton-on-Trent, I guess, but shome yearsh ago, shurely?

Yes, "A Double Diamond works wonders" was on posters by the 1950s and an (apparently unforgetable) jingle promoted the beer on tv in the 60s and early 70s. I hope Dave has awared himself a beer, Ind Coope or otherwise, for the couplng idea - it's certainly worth it.

 

Kit PW

  • Like 1
Link to comment
  • RMweb Gold
Mikkel
  • RMweb Gold

Clever stuff Dave.

 

Just to enlighten my slow wits: The foam is inserted before coupling up? And why three bits - is that one each side and one in the middle?

  • Thanks 1
Link to comment
  • RMweb Premium
Dave John
  • RMweb Premium

Hi Mikkel, 

 

Yep, the foam is three bits. The longer bar bit sits in the window of the corridor connection internal door. The other two bits are packers, which sit slightly proud of the brass corridor connection.  Nothing is glued, the assembly is tight enough to just sit there. I have to put that in place and then use tweezers to hook the couplings together, needs a straight track and good light. However these will only ever run as a fixed rake so I'm willing to live with that. 

 

I used that foam since I have quite a lot of it, it was I think packing from something, though it is a bit greyish.  Somewhere I have some that is really black so having proved the concept I will use that and make a neater job of it.

  • Like 1
  • Informative/Useful 1
Link to comment
  • RMweb Gold
Mikkel
  • RMweb Gold

Thanks Dave, the effect is convincing.

 

Indeed the smooth gliding run of your trains is a joy to watch. Not always the case on large layouts. 

  • Thanks 1
Link to comment

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...