With all the parts prepared and the radius arm fixed onto the central axle, I was ready to start pinning the chairs to the well base.

First I used a pencil to draw a circle using the radius arm notch. Then some trigonometry to work out the chair spacing. 80 chairs means an arc of 4.5º which relates to a chord slightly less than 15mm at the 60ft scale radius. But the four chairs at the joins of the two halves of the race rail need to be closer, so a slight adjustment was made to accommodate this. I needed two attempts to get the spacing right, despite all the planning.

I am going to run the turntable with DCC wired with a reversing module, so the race rail will have one polarity, the other feed coming through the central axle But I decided not to use rail joiners; instead I will wire each half, allowing a small gap for expansion during the summer months. The wires will be directly soldered to the bullhead rails. The design can always revert by insulating the gaps, but I doubt if I will ever do this.

The following photos show the progress:

Half way!

Completed:

This task, including the significant preparation of the nails and chairs, took me quite a few hours, with frequent breaks to rest sore fingers, etc. I am hoping this is the most arduous part of the installation module because I really want to crack on with with the turntable bridge so that track laying can begin.

The next post will be all about attaching the upper board which may involve some trial and error as I am using C&L track whereas the design is for Peco track. Does anyone know if there is a height difference between the two? Also, I may decide to use cork sheeting as a track underlay, and this will also have to be taken into account. It looks like I may have to make a whole lot of packing washers!