Round balers have come a long way from the Allis Chalmers machines that made miniature rounds bales. I am not old enough to remember these machines, but sadly I am old enough to remember the old Farmhand round balers of the late 1970s and early 1980s. Today, there are two distinct types of round baler, fixed chamber or variable chamber. The design and function basic principles are loosely the same in either grouping regardless of manufacture.