I am an Electronics Engineer, with several decades of PCB design experience, however I am currently working on a project that requires 6 Sliprings on a PCB.The carbon brush shape is 5mmx5mm.
The default track tool shape is round (which is fine for PTH and SMD boards), however a quick look through the top dropdown boxes does not seem to allow any alteration of the tool shape to something that has a square edge, I need a square leading edge that is always perpendicular to the axis point when using the Arc tool, so the end shape is always squared off.
I thought of using a square pad that was superimposed over the end of the rounded track end, however I cannot see how to rotate the square pad to get the desired result.
Any help would be most appreciated.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Thanks Andyfierman for your assistance, I am just getting back into PCB design work, and I never thought to look under Pad Properties, I was thinhing only of tracks.
I'll try this to see if it gives me what I want.
@ProblemSolver,
You're welcome.
There is no way change the shape of the ends of tracks. Using a pad is probably the tidiest work around. Other include using Solid Regions or laying multiple narrow tracks side by side to produce an approximation to a squared off end.
Be sure to set the net name of the Pad or Solid Region to be the same as the net to which it applies.
You may also find this topic useful:
https://easyeda.com/forum/topic/How-to-avoid-DRC-errors-when-connecting-to-PCB-Footprints-a-k-a-PCB-Libs-90bf944fe3644b21a7d27a9e9d8df8d6