20 represents the 1/10 (main parameter) of the maximum turning diameter on the lathe.
But the old model of 16,20 and so on behalf of the bed on the largest workpiece radius of 1/10, such as C616 that the largest workpiece body radius of 160mm, according to the new model is C6132, and so on.
Such as 20, said the largest workpiece on the bed rotation diameter of 200mm, 30 is 300mm, 40 is 400mm.
20 lathe is the spindle center to the bed distance of 200 mm lathe.
