How To Maintain The Lead Screw?
Publish Time: 2025-11-17 Origin: Site
1. Maintenance points and cycles
Maintain projects | Suggested cycle | Core requirements |
Lubrication | Every 100-500 hours | Select lubricant according to load and speed (ISO 6743/2:2021 standard) |
Cleaning | After each shutdown | Use no velvet cloth + isopropyl alcohol to avoid metal debris accumulation |
Pre-tightening check | Every quarter | Tested with torque wrench (error ≤±5%) |
Wear inspection | Yearly | Use laser rangefinder to measure thread clearance (standard value ≤0.05mm) |
2. Lubrication management specification
Lubricant selection
High speed scenario: lithium base grease (NLGI 2 class, ISO VG 68)
Heavy load scenario: Molybdenum disulfide composite lubricant (ASTM D4950 certified)
Environmental requirements: biodegradable lubricant (in accordance with ISO 14001:2015)
Note:
① Excessive lubrication may cause seal failure
② Mixing lubricants of different brands may cause chemical reactions (compatibility test is required)
3. Cleaning and anti-corrosion measures
3.1. Daily cleaning process
Remove the protective cover after power failure
Blow with compressed air (pressure ≤0.5MPa)
Residual oil stains should be wiped with acetone
3.2. Long-term shutdown anticorrosion
Coating anti-rust oil (in accordance with GB/T 7324-2008)
Sealed packaging (in an environment with humidity ≤ 40% RH)
4. Check standards regularly
Check item | Criterion of acceptability | Testing tool |
Screw wear | Single side wear ≤0.1mm | 3D microscope |
End play | ≤0.03mm (new screw) | Feeler |
Bolt tolerance | Bias ≤0.02mm | Dialgauge |
Wear monitoring: check the wear of lead screw and nut regularly, and replace them in time if serious wear or damage is found.
Running status: check whether the running is stable, whether there is abnormal noise or vibration, and adjust or repair when necessary.
5. Handling common problems
5.1. Abnormal noise
Possible cause: insufficient lubrication/thread lock
Emergency measures: Stop the machine immediately and use ultrasonic cleaner to treat it
5.2. Reduced positioning accuracy
Investigation steps:
① Check the preload (the torque value should comply with the manufacturer's manual)
② Measure the cumulative pitch error (the standard value is ≤0.05mm/300mm)
6. Six precautions
Prohibited operations
Do not use acidic/alkaline cleaning agents to contact the screw rod directly (may corrode the 304 stainless steel surface)
Fastener torque should be strictly followed in the manual (over torque may cause thread fracture)
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