Q1: What is a ball screw support unit?
A:
A ball screw support unit is a mechanical component that holds and stabilizes the ball screw shaft, ensuring precise linear motion by minimizing deflection, vibration, and bearing wear. It typically includes angular contact bearings preloaded in a housing.
Q2: Fixed-end vs. floating-end support—how to choose?
A:
- Fixed-end support:
- Used on the drive side (e.g., motor-connected end).
- Restricts axial movement to maintain screw alignment.
- Floating-end support:
- Used on the non-drive side.
- Allows thermal expansion/contraction to prevent binding.
Q3: Why does my support unit fail prematurely?
A: Common causes:
- Improper preload: Too tight (overheating) or too loose (play/vibration).
- Contamination: Dust/coolant entering the bearing housing.
- Misalignment: Shaft or housing not perpendicular to the screw.
- Overloading: Exceeding rated axial/radial load limits.
Q4: How to install a support unit correctly?
A:
- Align the housing: Ensure it’s perpendicular to the screw shaft (≤0.05mm/m tilt).
- Clean thoroughly: Remove burrs, oil, or debris from the shaft and housing.
- Preload adjustment: Follow manufacturer torque specs for locking nuts/bolts.
- Lubricate: Apply grease/oil to bearings as recommended.
Q5: When to replace the support unit?
A: Replace if:
- Abnormal noise/vibration during operation.
- Visible damage: Cracks, corrosion, or worn bearings.
- Excessive play: Axial/radial movement exceeds tolerance (check specs).
- Reached service life: Typically 20,000–50,000 hours (varies by load/environment).
Q6: Can I us ce a regular bearing instead of a support unit?
A:
No. Ball screw support units are pre-engineered with:
- High-precision angular contact bearings (for axial/radial loads).
- Sealed housings (to prevent contamination).
- Preload adjustment features (critical for accuracy).
