Design Multi-Point Balanced Lifting Scheme For Heavy Granite Bases To Prevent Bending Deformation Under Hoisting Load

   Ultra-large heavy granite bases weigh up to 100 tons and reach a maximum length of 20 meters, widely used in CMMs, semiconductor optical equipment and laser machining platforms. Most manufacturers adopt simple two-point lifting, which concentrates load on edges and causes midspan bending. Instant bending stress generates invisible internal microcracks, leading to gradual deformation, flatness and straightness failure, and heavy losses for metrology and semiconductor production lines. Equipped with 100-ton overhead cranes, mechanical simulation software and a professional fixture R&D team, UNPARALLELED launches a standardized multi-point balanced lifting solution for our 3100kg/m³ dense granite. Accurate lifting point layout, flexible pressure-equalizing fixtures and staged slow lifting eliminate bending stress entirely and preserve original precision.
   1. Root Causes of Bending Deformation
Our high-density granite has high rigidity but low bending toughness. Traditional two-point lifting has three flaws: concentrated end loads create irreversible midspan bending stress; rigid steel cables cause localized overpressure and edge chipping; fast hoisting produces dynamic impact and aggravates internal lattice damage. Most factories only prioritize lifting safety without addressing permanent precision damage.                                                
   2. Multi-Point Symmetric Lifting Layout via Mechanical Simulation
Our process team builds simulation models to design 4/6/8 symmetric lifting points based on workpiece size, weight and gravity center:
Workpieces under 5m: 4 rectangular points avoiding edge zones to eliminate midspan deflection.
5–20m ultra-long bases: 6 or 8 distributed points split overall bending into minor local stress, limiting deformation below 0.002mm.
Embedded lifting lugs are precast during precision machining to prevent surface scratches. The system calculates single-point load with a safety factor above 2.5.
   3. Flexible Equalizing Fixtures to Reduce Local Pressure
Thick polyurethane rubber pads enlarge contact areas to avoid cable indentation and corner breakage.
Balanced lifting beams with independent tension adjusters keep load deviation under 5% and prevent tilting.
Split bottom supports for slabs thinner than 300mm deliver dual-sided balanced bearing.
   4. Standard Slow Lifting Procedures to Avoid Dynamic Shock
Four standardized steps: pre-tension calibration, ultra-slow lifting (≤0.1m/s) with 30-second static inspection, steady low-speed transfer without sudden movement, and cushioned slow lowering on shock-absorbing mats.
   5. Application Benefits
This solution is fully deployed for 100-ton granite beds, semiconductor air-bearing platforms and metrology reference slabs. It eliminates bending risks, keeps flatness variation at nanometer level and cuts rework costs. Our two 200,000 m² factories support all heavy components up to 20m/100 tons, serving SCHUNK, Samsung and global metrology institutes with proven long-term precision stability.
   Innovation Outlook
   Industry lifting standards mainly focus on fall prevention while ignoring hidden stress deformation. Following our quality policy, UNPARALLELED extends precision control to transportation and fills the technical gap of precision stone lifting. Our R&D team will develop IoT real-time tension monitoring systems and intelligent simulation models for special-shaped bases. Full-process low-stress handling maintains original accuracy of heavy granite substrates, supporting stable performance of global ultra-precision and semiconductor equipment and advancing the ultra-precision industry.