You mention large mills.....maybe you are trying to refer to the HAAS UMC750ss I posted about? Well, I absolutely need every millimeter of the 24" workspace to mill 16 Dentures. The tolerance for Dentures is +/- a LOT!!!! lol We can be off by a mile and no harm. Not necessary for CNC mill to have 1um or less Glass Scales....but rather 10um mechanical resolution is just fine! +/- 20um accuracy is absolutely great for this application of Dentures. It is a piece of plastic to fit onto flexible soft-tissue. Not titanium. Not Aerospace assemble of Rocket-Ship. What are you even trying to say? That mill is the correct mill for the job I want it to accomplish. Thanks for your "opinions" I guess? Welcome to the CAD forum of Dental!! Good luck on the sales.