Luib Bridge

Discussion in 'Members Personal Layouts' started by Toto, Jul 16, 2016.

  1. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    :avatar: bad man .....

    And onwards ....... to the next three work faces that I will be on .......

    first up single track rural road .....


    next up will be the tunnel frontage which will be done in DAS clay ......


    and then ...... after I've sanded down the rear of the back board ...... the path way ......


    working my way down to ground level ..... ballasting and ground cover.

    there we have it.

    cheers

    toto
     
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  2. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Yikes !!!!!! ......Clearances ........


    Fine .....


    double take .........;


    close ......


    fine ........


    Yep ......

    I was going to add a thin layer of clay to the inside of the tunnel walls ..... it may need to be very thin ......

    :avatar:

    cheers

    toto
     
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  3. paul_l

    paul_l Staff Member Administrator

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    You just need a longer run at it, with that weight it'll get through - eventually :avatar:

    No wonder you've got a rock fall, with that going through the whole foundation will shake
     
  4. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    I might just get away with a very thin layer of DAS with a stone pattern rolled on it. That's the plan.

    Toto
     
  5. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    I feel the DAS Clay getting an airing tomorrow. :scratchchin: I could get away with a very thin coat of DAS on my road / track surface as well.:scratchchin: as thin as I can get it. Just a thought. I could actually tie that in with the tunnel frontage as it would bond well rather than trying to bond clay with plywood. ........ Jesus....... that's at least twice I have had thoughts today ...... my heads getting sore now. :avatar:

    Toto:avatar:
     
  6. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    This thinking business is nae good. ..... I've been at it again. Now ...... here is my thoughts .....

    The front of the tunnel portal is rough as a ragmans trumpet right . Well, I had intended to take a layer of very thin ply along it to flush it off a bit. ..... wait for it ........ why don't I flush it off by manipulating a layer of DAS Clay over the plaster bandage that is currently there. I could press a few track pins into the bandage here and there so to aid holding the " wall of clay " in place and give me a flush surface to attach the finished clay wall to.

    Now, if I create the finished clay frontage first, then as soon as I have the level frontage in place, I could bond the finished,d front to the clay behind it with PVA.

    What's your thoughts. A clay or ply sub surface ? ....... answers on a postcard please. :avatar:

    Cheers

    Toto
     
  7. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Still thinking ....... I am considering straightening of the portal front with plaster of Paris prior to using the clay ...... I used to be indecisive ...... but now I'm just not sure.

    Cheers

    Toto
     
  8. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Plaster it is and using bits of foam board as formers .....


    I had already taken the foam board off before I took the photo on this part. :facepalm:

    not on this one though .........


    and the foam board removed seconds after the plaster was applied and started to take adhesion to the foam board .....


    nice straight edge ....


    and the shunting siding to the traverser ......


    and the foam board removed .......

    Now ........ its all about clay .....Mmmmmm ..... could be nice and messy . lovely ......

    cheers for now

    toto
     
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  9. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    One last overall view ....


    thats it for now.

    cheers

    toto
     
  10. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    One last overall view ....


    thats it for now.

    cheers

    toto
     
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  11. York Paul

    York Paul Staff Member Moderator

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    I didn't want to say anything Toto because you are on a role and who am I to say how a man should build his layout. Scenics are all looking very charming and full of character. as for clearances the rule of thumb in the big railway world is the minimum safe spacing regarding the loading gauge kinetic clearance of fixed structures is 6' 2 1/2" , this is denoted by a red and white checkered plate worded Limited Clearance. So in O Gauge that distance would work out at 43mm between the rail (called the outside rail on double lines or it refers to both rails on a single line) (the inside rail is the rail nearest the six foot way) nearest the fixed structure. In this case the tunnel walls.
     
  12. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Well I've probably missed these clearances but at least it fits. the guys who blasted the tunnel were on a bit of a budget. :avatar: However, the track building guys aren't. :avatar: and they have been out on a Sunday earning double time and ..... a day in liue. The cheek of it.


    love this DAS clay stuff .....


    great to work with ......


    just keep a demister bottle of water by your side to keep it nice and pliable.

    having a bit of a stall as I think about tackling the stone walls now. I'm thinking about making a former to get the clay to a uniform thickness.

    More later.

    cheers

    toto
     
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  13. York Paul

    York Paul Staff Member Moderator

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    The main thing is everything looks good and is working well with engines getting through. :thumbs: It's going to look spectacular... I'm absolutely convinced of it.
     
  14. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    i think I may have to revert to my original plan. Cut a former out of foam board or daler board and stick the clay to it. Once dry, fix it in place. It will be easier to get the whole thing up in one piece that way and I can work on sculpting the stonework when the clay is fixed and trimmed to the card.

    not sure yet ...... working on it.

    cheers

    toto
     
  15. York Paul

    York Paul Staff Member Moderator

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    Well working as an independant assembly has the advantage of easy of access for you to do your scribing onto and also allows you to adjust position to suit before final fixing in place. the other element is in making a former from a set of measurements means all other tunnel apertures will be the same dimension. :thumbup: Just my two penneth's worth.
     
  16. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Well, I've come stuck. ........ So there. :p

    I've retired from the shed tonight to do a bit more thinking. I may have to build this bridge in a number of assemblies. I think I need to sketch it out on paper first to get all the parts identified and work out the right order to bring it together.

    Ill get it together yet. :avatar:
     
  17. paul_l

    paul_l Staff Member Administrator

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    1. Make a card / foam board template (upto the height of the upper pedestrian wall) pin in place and check for clearance

    2. Flat piece of board, cover with Baking Paper / Grease Proof Paper / Tracing Paper, roll out the Das to the thickness you require, then apply your texture.

    3. Overlay your template and cut out the Tunnel entrances

    4. Smooth the clay around the entrances and scribe in the edge stones including the keystone

    5. Cover in cling film and place a piece of 6mm ply on the top - this is to slow down the drying process and reduce curling of the clay.

    If it breaks repeat steps 2 to 5 :avatar:
     
  18. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    I'm working on it. Just needs a little thought and a fresh attempt. I kept the DAS hydrated as I was scribing it in order to stop the blade from dragging on it.

    I did not have the clay perfectly even all the way across the piece as I did not want to much uniformity but maybe I just need to slow it down, do a section at a time and walk away rather than try to do too much in the one go. I suppose the Beauty of the clay is it remains workable for hours unlike the plaster of Dublin.

    I'll have another go tomorrow with a fresh approach. I shall succeed. :avatar:
     
  19. paul_l

    paul_l Staff Member Administrator

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    Hi Toto

    Found this tutorial on the tube regarding Air Drying Clay (DAS)



    and thought it may be of interest for your tunnel mouths.

    Paul
     
  20. Toto

    Toto I'm best ignored Staff Member Founder Administrator

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    Good timing ....... you persuaded me to get my finger out ........


    A layer of foam board plaster bandaged on to the front fascia to take the clay. I figured the clay would stick better to the plaster bandage than the foam board.


    The parapet wall ........


    a bit more front on ......

    Clay next. I'll be making a start soon.

    cheers

    toto
     
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