Hydraulic Arbors use a closed fluid chamber to expand the steel sleeve radially within the gripping area. By clockwise rotation of the actuating screw, the piston assembly moves forward forcing the hydraulic fluid through the port holes. This movement creates extreme pressure under the sleeve and between the seals. The sleeve is expanded uniformly with equalized pressure thus providing absolute accuracy for positive part positioning and gripping. Counterclockwise rotation of the actuating screw releases the pressure and relaxes the expanding sleeve for part removal and loading.

NOTE: All hydraulic units are preset to limit over expansion.