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Hidden access door in mountain?

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  • Member since
    February 2007
  • 649 posts
Hidden access door in mountain?
Posted by AltoonaRailroader on Thursday, September 14, 2017 1:06 PM

Good afternoon,

I have a rather large mountain I'm building on my layout with card board strips, that will be covered with plaster cloth and sculptamolding. 
It also covers my initial transistion to my under layout staging. I know there will be times when I need to reach in there to get a derailed car/loco. 

My question is: How do I create a access door on my mountain that you can't tell is there. Should I give the mountain it's shell then cut it out? I'd like it hinged, but is it better to have a removable piece? I can add a pic later. 

 

Thanks, ARR

  • Member since
    January 2009
  • From: Bakersfield, CA 93308
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Posted by RR_Mel on Thursday, September 14, 2017 1:43 PM

I’ve attempted lift outs on my layout over the years and its very hard to make a seamless joint.  The best I did was using a rock formation to disguise the joint.  Where there were no rocks you could see the joints.  I tried all kinds of bushes and scenery to hide the joints but nothing worked very good.
 
I did better using Paper Mache mixed with Elmer’s Carpenter’s Glue then cutting it with a small wallboard saw.  The Paper Mache is much stronger than the plaster mesh (much lighter too) and doesn’t crack when moved around.
 
I made several modular type sections that would lift out for maintenance on the workbench.  I used 2” wide strips of paper towels as a tape over the joins then did a scenic finish over the joints, if I ever need to remove a section a #11 blade will easily cut the paper strips.
 
 
 
Mel
 
Modeling the early to mid 1950s SP in HO scale since 1951
 
My Model Railroad   
 
Bakersfield, California
 
I'm beginning to realize that aging is not for wimps.
 
 
  • Member since
    February 2007
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Posted by AltoonaRailroader on Thursday, September 14, 2017 2:10 PM
Thanks for the reply. It's in the back of the layout so visitors probably won't see that much detail from where they stand. :)
  • Member since
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  • From: Reading, PA
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Posted by rrinker on Thursday, September 14, 2017 3:34 PM

 I haven't built one but every example that I've ever seen, the opening was framed out and scenery built up to the edges of the frame. The removable piece was made, and set into place, with somethign non-stick like wax paper in the joint, and then matching scenery was built on top of the removable piece. I did see one where the scenery on the removeable hatch actually extend out past he edges, which would give a fairly well concealed joint, but also mean the edges of the hatch could be easily damaged. 

 So far in my plan, the only thing I see where there might be an access issue is the helix, but given that it is a greater than 30" radius, that means there will be about a 5 foot square space in the middle I can duck under and come up inside if needed. Just need to add some lights. I'm trying to design it so that a good protion of the first loop at the bottom is visible - as much as 3/4 of it - to reduce the hidden run.

                            --Randy


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

  • Member since
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  • From: 4610 Metre's North of the Fortyninth on the left coast of Canada
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Posted by BATMAN on Thursday, September 14, 2017 3:52 PM

The two best I have seen were done with brush and trees around the part that lifts out. The hill was good as the brush covered the seam, but it had a dirt road along part of the edge of the seam and it looked like the brush was growing out over the road.  The other was a pond for cattle to water at. The pond lifted out and it had brush stuck around the edge of the water. It was really well done.

Brent

"All of the world's problems are the result of the difference between how we think and how the world works."

  • Member since
    January 2009
  • From: Bakersfield, CA 93308
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Posted by RR_Mel on Thursday, September 14, 2017 4:18 PM

I went with the concept that Randy described using Saran Wrap to prevent sticking for several sections and that works very good but close up the joints are still visible.  The edges do become fragile.  
 
I have a bunch of removable sections on my layout mainly because I’m constantly modifying stuff, because of old age it’s much easier to work sitting at my workbench.
 
Unfortunately all of my removable modules are close enough that even the smallest joint is easily seen making it necessary to finish them with scenery.
 
 
The picture above is one of my removable sections on my work bench during construction.  The base is a 2’ x 4’ x 2” foam sheet.  The raised portion is also carved foam blocks.  The foam is very strong and it is covered with a ¼” thick layer of Paper Mache increasing the strength of the section.  The rock castings are made with Hydrocal.
 
 
In the picture above the line shows where the joint is with the section in place.
 
 
This shows the rock joint, it’s pretty well hidden.
 
 
The joint is finished with ground cover, about 45 to 50 tall pines will be installed on and around the section.
 
Like Randy I left a good portion of my helix exposed.  With all of my Arduino projects I'm glad I made everything accessable for modifications.
 
 
EDIT:
 
While I really like using Paper Mache for a base cover because of its light weight and high strength but I must warn anyone not familiar with it that it shrinks and will warp foam and thin plywood as it dries.  I use Saran Wrap to prevent any warping.  ¼” to ⅜” thick Paper Mache will work as a strong standalone base for mountains with very little or no support under it.
 
 
Mel
 
Modeling the early to mid 1950s SP in HO scale since 1951

 

My Model Railroad   
 
Bakersfield, California
 
I'm beginning to realize that aging is not for wimps.
 
 
  • Member since
    September 2003
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Posted by mlehman on Friday, September 15, 2017 2:10 AM

The way I do mine is to make the entire mountain a door. Eerything to the top and right of the upper track here is part of a liftout mountain that is about 6' long overall.

I start with a base of 2" pink foam, then layer up and shape it, covering it with a thin layer of Sculptamold -- it's not all that heavy, party because I tend to limit the amount of plaster rock casings I apply. Here it is in pink.

And before I finished the base popped open enough so that you can see how it comes out.

As you can see, it sits on the crossmembers. Watch your overhead clearance, as it has to have enough to you can lift it out with the highest point on it hitting the ceiling.

Mike Lehman

Urbana, IL

  • Member since
    February 2005
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Posted by davidmurray on Friday, September 15, 2017 9:55 AM

Our club had a portable layout with joints every four feet.  The gaps were hidden with lichen at every show, and it worked well.  If the scenery was planned so that the joints were in a gulley, this should work well.

Dave

 

David Murray from Oshawa, Ontario Canada
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  • From: Bedford, MA, USA
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Posted by MisterBeasley on Friday, September 15, 2017 8:24 PM

This is the access hatch at one end of my layout.  Most of the scenery on the top of the hatch is a tannery.

The hatch itself is a piece of 2-inch foam.  Here it is in place.

Note in particular the white building on the right.  Here is what the liftoff looks like as it's being slid down into place.

To create this, I lined the outside edge with Saran Wrap and then layed plaster cloth across the gap.  In the third picture, you can see the overhang attached to the liftoff section and the bare strip around the base.

I further disguise the edges with turf, ground foam and static grass.  There's an edge somewhere in this picture.

 

It takes an iron man to play with a toy iron horse. 

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