I recently purchased a CNC 6040 and am going to set up up soon with Mach3. When looking around for instructions and tutorials, I found that they are all different. The cd istructions that came with the 6040 is not the same as the instructions from the manufacturer's Youtube videos. And Arcsoft's tutorials are different also.
 So which tutorial have other's used for the 6040 to make it work?

Not quite a simple as it appears to be. 

There are many variants (or clones) of the basic CNC 6040 so you may just have to try all the set-up options until you find one that works for you.

Tweakie.

Thank you Tweakie.