Sector Table
The Fiddle Yard comprises a Sector Table, mounted in a rhomboid board. The table is 15″ overall (7.5″ radius). There are three tracks, which are energised via brass bolts, which also locate the tracks with the entrance track.
Fiddle Yard exit
Some details of the pivot, which also provides the electrical common return to the tracks.
Underside of Sector Table
Fixed aluminium socket
Pivot pin
Top of Sector table, showing locating bolts
My apologies to any who have previously used the calculations below – I found an error in my Formula 3, and so have corrected, as of 1 May 2017.
I have described how I calculated the radius of the curved tracks here:
A spreadsheet to assist with calculating the curves here:
Elmgatemodels Blog 
4 September 2016 at 8:26 am |
Very useful — sector tables are much easier to construct than traversers. Useful too if through running is required for continuous run.