That's a very useful analogy Tweakie -- I agree that Power Steering is utterly indispensable
If you look at my profile you'll see that I also 'Looked at' Mach2 in 2007 but I didn't have a machine at that time and I'd even forgotten about it until I tried to register on the forum last week so naturally was not aware of the history.
Essentially the 'arithmetic' - not even 'Maths' - involved in calculating the tool-paths for shapes that can be easily determined by hand-coding is quite trivial. It would be a different matter if I was trying to plot NURBS curves by hand!
I might get as far as plotting a Reuleaux Pentagon (as in my Avatar) but that could be a bit challenging.
My real concern was that the errors I am finding might be down to a fault in my S/H Denford MicroRouter and the reason for it being sold on. I've already found that the vertical alignment of the motor was compromised (now corrected) but it's good to know that my fears are mis-placed.