It doesn't really matter a whole lot when your leadscrews are imperial and your parts are metric. We make metric parts in the states on imperial machines all the time... A 1/2 Dia screw with a 10 turn per inch lead, it's in metric terms a 12.7mm 10 turn per 25.4mm screw. If one turn of the lead screw moves the axis .1 inch then the same screw moves the axis 2.54 mm. It's not nice round numbers in Metric terms but once you have your machine set up to use metric units you don't have to think about whether or not you have imperial lead screws or not.
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Nathan |