Working on sourcing parts for Reprap's and I was shocked to find out that the metalworkers in the area had to convert all my numbers to standard. In electronic

Working on sourcing parts for Reprap's and I was shocked to find out that the metalworkers in the area had to convert all my numbers to standard. In electronics manufacturing we used whatever the print had so I just assumed everyone did. I stick with the standard I am used to which is use whatever the print has on it...if its standard I use standard, if its metric I use metric. I still prefer miles and gallons to km and liters but if I am doing a precise measurement I will use mm. In electronics everything is metric so that is what I use. Conversion errors kill spacecraft...right?