1. Master/Slave Alignment Strategy
Do not fully tighten both rails simultaneously. Secure the Master Rail first to establish a reference straightness. Leave the Slave Rail mounting bolts finger-tight. Install the carriage and slide it along the full stroke; the rigid carriage will naturally pull the Slave Rail into parallel alignment. Tighten the Slave Rail bolts progressively behind the moving carriage.
2. Surface Planarity
While SBR rails offer some compliance, they cannot compensate for significant frame torsion. Ensure the mounting surface is planar and free of debris, burrs, or weld spatter. A twisted mounting surface will result in carriage binding and uneven wear.
3. Calibrating Preload
Utilize the side-mounted set screw on the SBR block to adjust the internal bearing clearance. Tighten the screw just enough to eliminate radial play ("wobble") while ensuring the block still slides freely under its own weight. Caution: Overtightening will damage the raceways.
4. Optimizing Butt-Joints
For rail lengths exceeding standard stock (butt-jointing), audible "clicking" indicates misalignment. To resolve this, loosen the joint bolts and bridge the gap with a bearing block. Tightening the bolts while the block spans the joint forces the shafts into perfect concentricity for a smooth transition.
5. Load Orientation
The SBR bearing utilizes an "Open" configuration. The system is structurally strongest under compressive loads (downward force). Avoid designing systems where the primary force is tensile (pulling the block upward off the rail), as the housing is weakest in this direction.