Hi Bouyen - Yes a 0.075mm Cl would need 1800 mm/min and 24000rpm. I'll get some aluminium plate and set up a test. Guhring have 0.037mm (0.6%) in their 1F 6mm table. Seems too small. And Suttons spec 0.016mm (0.3%) again seems to be way too small. But I'll test this out. Peter

amana are at the 0.0045" or 0.11mm mark. so feed would be 24000x.11= 2640mm/min