Metric and imperial units are both used in CNC machining. Understanding how they relate helps avoid errors and ensures correct feeds, speeds and tolerances.
Instead of calculating by hand, use the Metric ↔ Imperial Unit Converter to switch between common CNC values.
Incorrect units can lead to feed rates being off by a factor of 25.4, resulting in tool breakage or poor surface finish. Imperial units are still common in aerospace, moldmaking and in the US market, while most of Europe uses metric exclusively.