Sir Lamiel’s 777 Quest - A Scale7 Micro Layout Challenge

[magmouse]

This discussion of baseboards is interesting for me at the moment as I am currently drawing up a design for laser-cut construction:




This is the fiddle yard board for my 777 project, 400mm x 1000mm. Changes from the standard G&H design are a denser supporting structure, which is also full depth (100mm). I'm hoping this will bring the necessary stiffness. My lightening/access holes are larger, so weight shouldn't go up too much.

I will be changing the ends to a full double layer (6 + 6 = 12mm thick) to accommodate the pattern-maker's dowels. Joining bolt holes and handhold holes still to be drawn...

After that the more complicated main board:



The sky background will have rounded corners made with a thin ply insert, bringing the footprint nicely within the 7 sq ft rule!

Nick.

 

[adrian]

There are many ways of making it torsionally stiff. Bracing the lower edges of the sides (all round) and then somehow stoping one side moving relative to the other is key

and for another variation, instead of cross bracing I’m trying curved spars. These are short boards to test principles and joints for a test track. 2 boards at 2’ by 1’ each and in total weigh about 2.5kgs just over 5lbs for the pair joined together.

 

[daifly]

There has been a bit of a discussion here about bracing of baseboards. Whilst I want my boards to resist twisting, this is not a force/motion to which they will often be exposed. There will be a fully adjustable leg at each corner so, in use, there should be no twist anyway.

Sagging between cross-members is surely a greater consideration and needs to be minimised to avoid heavy locomotives riding a series of ridges and furrows as they cross a baseboard.

Or am I missing something?

Dave

 

[Dog Star]

Or am I missing something?

No.