3-1
3. Mounting Procedure
Ball Screw
3.
Mounting Procedure
3-1
Assembling the Support Unit
(1)
Mount―the―fixed―side―Support―Unit―on―the―screw―shaft.
(2)
After―inserting―the―fixed―side―Support―Unit,―secure―the―lock―nut―using―the―fastening―set―piece―
and the hexagon socket set screws.
(3) Attach the supported side bearing to the screw shaft and secure the bearing using the snap
ring, and then mount the assembly on the housing on the supported side.
Note1: Do not disassemble the Support Unit.
Note2: When inserting the screw shaft into the Support Unit, take care not to let the oil seal lip turn
outward.
Note3: When securing the set piece with a hexagon socket set screw, apply an adhesive to the hexagon
socket set screw before tightening it in order to prevent the screw from loosening. If planning
to use the product in a harsh environment, other measures must also be considered to prevent
loosening. Contact THK for details.
Supported Side
Bearing
Snap ring
Fixed Side
Collar
Set piece
Hexagonal socket head set screw
Lock nut
3-2
Checking Accuracy and Fully Fastening
While checking the runout of the Ball Screw shaft end and the clearance in the axial direction
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.
Move table and adjust for fully smooth
motion
Measure runout
Measure clearance
in the axial direction
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