So whilst getting along with the electronics circuits I am going to start to fashion some machine guards to protect both me from the machine screws (I have a tendancy to get too close to the machinery - through no fault of my own) and also to stop flying chips and debris getting into the screws.

Whilst at that I want to run some ally channel so I can have the E chain run along side the guards, what size chain do people generally use for the various bits of the machine?

I can see at the moment I am likely to have:

z axis - spindle main cable, z axis limit and home switch and water pipes for spindle, z axis motor cable

y axis - All the above plus the y axis motor, y axis limit and home switch

x axis - all the above plus the x axis motor wire, x axis limit and home switch

Any suggestions on size?

I can get hold of up to about 50 x 20 from a local supplier but its pretty pricey p/m