For precision dispensing and inspection platforms requiring ultra-precise micro-displacement control, the end runout of support units directly affects the stability of the equipment’s motion reference and acts as a hidden key factor influencing production yield.
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Select integrated flange support units with pre-mounted paired angular contact ball bearings
Equipped with factory preloaded matched angular contact ball bearings and precision ground flange surfaces, these units withstand radial and axial loads simultaneously, eliminate axial play and build rigid foundation for low end runout.
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Strictly control fit tolerance between support unit and mounting hole
Adopt transition or slight interference fit. Maintain high circularity, cylindricity and surface roughness of the bore to avoid outer ring deformation and extra runout caused by geometric errors.
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Ensure flat mounting base and perpendicular positioning shoulder
The flange must attach to a high-flatness base, and the positioning shoulder shall stay perpendicular to the screw axis. Misalignment creates eccentric torque and periodic end runout of the lead screw.
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Apply proper preload via adjustable preloading structure
Use lock nuts or shims to exert appropriate axial preload to eliminate bearing clearance, boost torsional rigidity, balance thread load during rotation and reduce radial runout from insufficient axial stiffness.
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Measure end runout after full assembly
Inspect the end face and shaft runout with a dial indicator during rotation to verify compliance with design standards, eliminating component errors and accumulated assembly tolerance before formal operation.
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