While I had the Barista Express machine open for repair, let's look at the grinder adjustment mechanism.
It seems to be a rather simple, yet functional mechanism. There's a motor and gear box that turn the inner burr that is fixed in position. The outer or top burr can move up and down using a threaded adjuster. The adjuster is a large cog driven by the smaller grinder adjustment dial that has numbers from 1-fine to 16-coarse. Total vertical movement is less than a millimeter.
Newer machines apparently have a further adjustment on the top burr where it can be set in 1 of 10 positions to change the grind size.
There is nothing inside the grinder that appears to serve as a "calibration" feature and thus the grind "numbers" are just that, numbers. So you really need to figure out what grinder setting to use on your machine with your coffee beans to get a good result:
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Of course, if you don't want to mess around with that, use the double wall / pressurized filter basket and you can pretty much work with any grind of coffee:
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