Flatten one dough piece at a time, and dust generously with flour, brushing off excess. Set your pasta machine to the widest setting; run the dough through. Fold the dough into thirds like a letter, then run it through again, short end first. Run it through 2 more times, dusting with flour if the dough gets sticky. Return the dough sheet to the floured board, cover with a towel and repeat with the remaining 3 dough disks. Keep any dough you are not working with covered with a damp kitchen towel or in the bag.