Mounting Procedure

• Install the fixed side Support Unit with the screw shaft.
• After inserting the fixed side Support Unit, secure the lock nut using the fastening set piece and the hexagonal socket-head setscrews.
• Attach the supported side bearing to the screw shaft and secure the bearing using the snap ring, and then install the assembly to the housing on the supported side.

  Note1) Do no disassemble the Support Unit.

  Note2) When inserting the screw shaft to the Support Unit, take care not to let the oil seal lip turn outward.

  Note3) When securing the set piece with a hexagonal socket-head setscrew, apply an adhesive to the hexagonal sockethead setscrew before tightening it in order to prevent the screw from loosening. If planning to use the product in a harsh environment, it is also necessary to take a measure to prevent other components/parts from loosening. Contact THK for details.

• If using a bracket when mounting the ball screw nut to the table, insert the nut into the bracket and temporarily fasten it.
• Temporarily fasten the fixed side Support Unit to the base. In doing so, press the table toward the fixed side Support Unit to align the axial center, and adjust the table so that it can travel freely.
  • If using the fixed side Support Unit as the reference point, secure a clearance between the ball screw nut and the table or inside the bracket when making adjustment.
  • If using the table as the reference point, make the adjustment either by using the shim (for a square type Support Unit), or securing the clearance between the outer surface of the nut and the inner surface of the mounting section (for a round type Support Unit).
• Press the table toward the fixed-side Support Unit to align the axial center. Make the adjustment by reciprocating the table several times so that the nut travels smoothly throughout the whole stroke, and temporarily secure the Support Unit to the base.

While checking the runout of the ball screw shaft end and the axial clearance using a dial gauge, fully fasten the ball screw nut, the nut bracket, the fixed side Support Unit and the supported-side Support Unit, in this order.

• Mount the motor bracket to the base.
• Connect the motor and the ball screw using a coupling.

  Note) Make sure the mounting accuracy is maintained.

• Thoroughly perform the break-in for the system.