What is the difference between work-and-turn and work-and-tumble?

Answer 1

Work-and-turn is a technique enabling the use of just one plate. The copy for the pages on one side of a full sheet is put on one half of the plate and the copy for the pages on the other side of the sheet appears on the other half of the plate. The sheet is printed, and then rotated 180° as well as turned over and printed again on the other side. After printing, the sheets are cut in half to yield a double quantity of sheets. If 1,000 sheets were required for the job, only 500 pieces of paper would be required for the run. The gripper edge remains the same.

Work-and-tumble works the same as work-and-turn except the paper is flipped head over heels, and the gripper edge changes ends.