Sketchup is both super simple and yet also has many quirks that make it unsuitable for CNC machined parts:
Sketchup files with Curves are Faceted
Based on how Sketchup creates model forms - 2D or 3D - all curved objects will be faceted. There is no quick fix to this. To machine smooth shapes the model will need to be rebuilt in another CAD software. We recommend Fusion 360.
It is not as evident when making the shapes in Sketchup but in any other CAD software Sketchups forms will be faceted.
Imported Sketchup Files are Mesh
When importing Sketchup into Fusion 360, the bodies will import as mesh objects. This is typically not useful. Portland CNC often uses Rhino to import Sketchup files which will import as proper solid bodies (still faceted).
File Won't Open in other CAD
Sometimes Sketchup will make a version update and other CAD software can't open it. Portland CNC's version of Rhino will open 2015 or older Sketchup files.