How to Build a Concrete Table Vibrator

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Building your own concrete vibrating table can be useful when dealing with concrete mold projects. Pouring concrete into a mold often raises air bubbles throughout the concrete, which if allowed to remain can cause imperfections in the surface of the molded concrete, decreasing the strength of the concrete object. By vibrating the molded concrete, the air bubbles are forced to the top of the surface, where they dissipate, leaving the detail of your mold perfectly formed.

Things You'll Need

  • Electric screw-down vibrator
  • 2- by 4-foot, 3/8-inch melamine sheet
  • Pencil
  • Electric drill
  • ¼-inch drill bit
  • 4 bolts, 1/4 inch and 2 inches long with matching nuts, locking nuts and fender washers
  • 2 boards, 1 by 2 inches and 24 inches long
  • 2 boards, 1 by 2 inches and 44 inches long
  • Wood glue
  • Wood screws
  • 3 Styrofoam sheets, 2 feet by 4 feet
  • Stapler
  • Place the screw-down vibrator in the center of the melamine sheet. Use a pencil to mark the four screw holes in the base of the vibrator. Remove the vibrator from the board and set it aside.

  • Drill holes through the board at the four marks.

  • Align the screw-on vibrator with the drilled holes. Place the fender washers onto the bolts and then run them through the board from the bottom, and through the vibrator. Placing the washer followed by the lock washer onto the bolts, and then secure the vibrator to the board using both the nut and locking nut. Tighten the nuts as tightly as possible, without damaging the board.

  • Glue the 1- by 2-inch boards to the top edges of the melamine to serve as safety rails, preventing the vibrating concrete from sliding off the board. Allow the glue to set for one hour and then screw the boards into place with wood screws for extra strength.

  • Place the board upright and then staple the Styrofoam sheets to the board bottom. The Styrofoam provides spring to the vibrating board and will help spread the vibration along the complete board surface rather than at the center of the board only.

  • Tape the vibrator cord to the board, leading off the edge to prevent the cord from moving as the board operates.

  • Place the board onto any flat surface, and operate it by switching on the vibrator controls. Any molds placed onto the board will vibrate, moving air to the top of the mold, and settling the concrete contents.

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