The basic difference between a universal horizontal milling
machine and a plain horizontal milling machine is in the adjustment of the
worktable, and in the number of attachments and accessories available for
performing various special milling operations. The universal horizontal
milling machine has a worktable that can swivel on the saddle with respect
to the axis of the milling machine spindle, permitting workpieces to be
adjusted in relation to the milling cutter.