[Pat Fairbank]

We use an odd mish-mash of Metric and ANSI. Since we're located in Canada, a lot of the stuff we get exclusively in Metric (fasteners and extrusion) while other stuff we can only get in ANSI (shafts, thicknesses of metal and Lexan, etc).

However, we think mostly in ANSI since that's the way FIRST thinks, and we've all gotten to the point of doing the conversions without having to think about it.