To ensure the long-term reliability and accuracy of your linear motion system, adhere to these three "Golden Rules" when specifying and installing support units:
- The Fixed-Floated Configuration: Always employ a Fixed (K-type) unit on the motor side to absorb axial thrust, and a Floated (F-type) unit on the tail end. Never use two Fixed units on a single axis; the rigid clamping of both ends prevents necessary thermal expansion, which will cause the ball screw to buckle and lead to catastrophic bearing or shaft failure.
- End-Machining Compatibility: The support unit must match the dimensions of your ball screw's end-machining. For example, a BK12 unit requires a 12mm shaft journal. If your screw is machined to a different diameter, the system will not seat correctly. Always verify your shaft end-machining drawings against the support unit's "Inner Bore" specification before final procurement.
- Mandatory Preload Execution: For Fixed-side (K-type) units, the installation of the included precision lock nut is critical. Properly tightening this nut establishes the bearing preload, which eliminates internal clearance and ensures a rigid, zero-backlash connection. Failure to set the preload correctly will compromise the positional repeatability of the axis.