I was discussing the BRM Cakebox challenge at the Manchester show.
It was commented that there was not much space.
"I could fit a circle of track in that space " I replied.
T gauge, Z gauge or 009 a possibility? people mused, but that would be silly!!
So Gn15 Emett it had to be.
I have pre-tested some items so some pictures are post-assembly
The initial concern was bending the (code 100) track to the correct diameter never having tried this before.
I was advised to use bullhead rail rather than flatbottom, which is good advice, but having none in my bits box flatbottom rail it was.
Since the inside rail was only going to be 3-inch radius (76mm), care bending was clearly needed.
I used a metal (magnetic parts) tray to help bend the rail.
Rather than use a track joiner rail was soldered directly to 6mm PCB sleepers. The rail being cut to size in situ.
I also realised it was going to be easier to use the tray to form the track reducing the radius to 72mm in the process.
The PCB copper was then split by grinding the top surface off rather than cutting. I prefer this method both aesthetically and mechanically.
The prime mistake was to use a cake base, as the corners started to curl. So this was cut to leave a track base, a plywood base to be added later.