Hi All

I am thinking of building a 3Axis CNC mill.

I have been looking online at what others have done and I see a lot of people using rollers on the axis motion. However, all "real" machine tools that I have worked with have used sliding steel-on-oil-on-steel surfaces. No wheels or rollers just flat surface on flat surface or v on v. Do I have the wrong impression of the professional stuff or is there a reason that home brewers do it differently?

Thanks


Hubert