Building a portable cattle feeder involves the use of pipe and sheet metal for the frame and corrugated metal and wood for the roof. This structure does not require wheels, as it is light enough to move when empty.
Begin building the cattle feeder by framing the roof. Use 14-foot, 2-inch by 4-inch boards for the outer frame. Place an 8-foot, 2-inch by 4-inch board in the center of the frame. Add one 14-foot, 2-inch by 6-inch board perpendicular to that board to complete the roof frame.
Build the body of the feeder placing 6-foot pipes that are 6 inches in diameter in each corner. Use 8 feet of pipe to build the bottom frame. Cover the bottom and sides of the feeder with sheet metal; it should be 13 inches on each side. Use square tubing to build an open enclosure to hold hay right above the sheet metal. Bars should be spaced 13 inches apart.
Attach the corrugated metal roofing with a carriage bolt placed in the center of the roof. Use carriage bolts to attach piping to the roof. Weld all joints.
The feeder should be able to hold hay bales that are 7 feet in diameter. If smaller bales are used, the dimension should be changed from 8 feet to the size of the bale plus 12 inches. The feeder should be fastened to the ground in order to keep it upright during high winds. If the ground on which the feeder is transported is either soft or spongy, 4 inch diameter pipe should be used.