This is great point. For metalworking, inches are great for length because the tolerance limits of a typical machine are around .001". You can use cm, but it's

This is great point. For metalworking, inches are great for length because the tolerance limits of a typical machine are around .001". You can use cm, but it's awkward. I've also found that with complex calculations, the metric system's ease can be frustrating - it hides "off by a power of 10" unit errors.