We have different libraries, one metric and one imperial and we don't mix the operations; metric goes to one cnc and imperial to another. It is the exact same machine, just in 2 different countries. 

With the metric, when processing to send to the cnc, how do we know which parameters need to be converted to imperial and which not? 

For example we are trying to figure out if we need to convert our feed rate to imperial, our ramp in definitely is not working right and the very start of each cut, the router goes all the way to xy0 but the bit is almost scraping the top of the material it is so close.