No need for such space technology as you are led to believe then . Otherwise prepare quite some cash, if you want the parts for the machine to be made by surface grinder. I think you are mistaking a normal over all accuracy with real laboratory surface accuracy which is measured at each point. In short, don't worry about that!

I will help you with advice if you dont mind, but first you need to set some priorities.

For example the next questions are:

What's your budget for that machine? What's your idea for that size working area? You dont need bigger, want to keep cost down, or want machine to be portable or...?


One thing that comes to my mind is that if i was doing that machine, i will make it properly so i could mill steel with miniature bits on it. Steel stamps and so. And would not worry too much about spindle, cause yes its capable, jobs would be miniature and 1 job probably will cover the cost of new spindle. A steel stamp for example. In other words i see that aluminum a bit flimsy to my liking. Considering the money you would spend on rails, motors and drivers. And by the way 20 size rails is better, same money, easier to design clearances for ball screws and so.

What CAD you are using?