Hand-operated Slab Grinding Machine
1. Executive Summary & Equipment Positioning in Modern Stone Plants
In contemporary stone fabrication facilities, automated multi-head line polishers handle high-volume, uniform slab production. However, custom stone projects, irregular tombstone shapes, edge chamfering, surface defect remediation, and small-batch slab finishing demand high operational flexibility that automated lines cannot economically deliver.
The Hand-operated Slab Grinding Machine (Model Series SFM-2600A/B) manufactured by Fujian Province Kaida Stone Machinery Co., Ltd. serves as an indispensable auxiliary and primary surface-refining workstation. Featuring a 360-degree double-pivoting articulated radial arm with a 2,600 mm working reach, a heavy-duty HT200 cast-iron vertical column, and a high-torque dual-speed drive, this equipment bridges the gap between labor-intensive manual angle grinding and rigid automated machinery.
2. Step-by-Step Surface Processing Workflow & Abrasive Compatibility
To achieve mirror-like surface gloss without swirl marks or thickness discrepancies, the Hand-operated Slab Grinding Machine utilizes a standardized multi-stage grinding and polishing protocol:
Stage I: Surface Leveling & Rough Stock Removal
- Objective: Remove gang-saw step marks, surface rough spots, and uneven slab lips.
- Abrasive Selection: 50# to 150# metal-bonded diamond grinding discs or coarse Frankfurt abrasive blocks.
- Motor Setting: Low-speed mode (960 rpm / 5.5 kW) to maximize torque output and material removal rate while stabilizing down-pressure.
Stage II: Intermediate Smoothing & Scratch Elimination
- Objective: Eliminate micro-scratches from coarse grinding and prepare the stone matrix for color depth enhancement.
- Abrasive Selection: 300# to 800# resin-bonded diamond pads or silicon carbide grinding stones.
- Motor Setting: Transition to high-speed mode (1440 rpm / 7.5 kW) with steady continuous water cooling (1.0 m³/h flow rate).
Stage III: High-Gloss Polishing & Buffing
- Objective: Develop optical clarity and high reflection gloss (>85 GU) on granite, marble, quartzite, or nano-crystallized glass.
- Abrasive Selection: 1500# to 3000# extra-fine resin pads followed by buffing felt with oxalic acid polishing powder or stone care paste.
- Motor Setting: High-speed mode (1440 rpm) with minimal down-pressure to avoid surface overheating or stone discoloration.
Stage IV: Arc Slab & Edge Profiling (Optional Setup)
- Objective: Finish curved vanity edges, tombstone moldings, round stone table tops, and column caps.
- Tooling Setup: Paired with an auxiliary 360° rotating craft workbench, allowing the operator to guide the grinding head seamlessly along complex convex or concave curves.
3. Structural Engineering & Core Component Analysis
• Solid Precision Round Column Guide Surface (Smooth Slip Travel)
• Model A: Motorized Lead Screw Lift | Model B: Pneumatic Cylinder Assist
• Sealed Heavy-Duty Pivot Bearings (Friction-Free Manual Guidance)
• PANASONIC PLC Microprocessor & Frequency Inverter
• Touch-Sensitive Ergonomic Operator Panel
Heavy-Duty HT200 Cast Iron Foundation
The entire structural skeleton-including the base column, swivel knuckles, and main arm housing-is engineered from high-density HT200 cast iron. This high-mass casting absorbs internal resonance and external cutting forces during heavy grinding, ensuring tool stability and preventing vibration chatter on sensitive marble surfaces.
Solid Round Column Vertical Guide
Vertical arm positioning relies on a precision-ground, chrome-plated solid round column cylinder. The smooth bearing sleeve interface eliminates backlash during elevation, maintaining accurate tool alignment and consistent surface flatness.
SIEMENS Main Motor with Reinforced Seat Mount
Power is supplied by an industrial SIEMENS main motor secured to a reinforced structural mounting plate. The dual-speed winding allows immediate switching between heavy roughing torque (960 rpm) and fine polishing velocity (1440 rpm), ensuring thermal stability during continuous 24-hour factory shifts.
PANASONIC Electrical Controls
System operations are governed by a PANASONIC PLC and frequency inverter, providing smooth motor starting, overload protection, and reliable control via a water-resistant touch-sensitive operator panel.
4. Technical Specifications & Performance Metrics
| Parameter Category | Specification Details (SFM-2600A) | Specification Details (SFM-2600B) |
|---|---|---|
| Lifting System Drive | Motorized Screw Drive (Electric Lift) | Pneumatic Cylinder Assist (Pneumatic Lift) |
| Working Radius (Max) | 2,600 mm | 2,600 mm |
| Gyro Reach Radius | 600 mm | 600 mm |
| Vertical Stroke Travel | 0 – 100 mm (Up to 650 mm column adjustment) | 0 – 100 mm (Up to 750 mm cylinder adjustment) |
| Main Motor Power | 5.5 kW (Single-Speed) / 7.5 kW (Dual-Speed) | 5.5 kW (Single-Speed) / 7.5 kW (Dual-Speed) |
| Motor Brand | SIEMENS Industrial Motor | SIEMENS Industrial Motor |
| Spindle Rotation Speed | 960 / 1,440 rpm | 960 / 1,440 rpm |
| Grinding Disc Diameter | Φ 105 mm (Accepts Φ 100–180 mm) | Φ 105 mm (Accepts Φ 100–180 mm) |
| Marble Output Rate | 8 – 9 m²/h (20–30 mm medium-hard slab) | 8 – 9 m²/h (20–30 mm medium-hard slab) |
| PLC & Inverter Brand | PANASONIC | PANASONIC |
| Frame Material | High-Density HT200 Cast Iron | High-Density HT200 Cast Iron |
| Water Consumption | 1.0 m³/h (Central Wet Cooling) | 1.0 m³/h (Central Wet Cooling) |
| Overall Dimensions | 3,200 × 1,800 × 1,600 mm | 3,200 × 1,800 × 1,700 mm |
| Machine Net Weight | ~ 800 kg | ~ 850 kg |
5. Economic ROI & Workshop Total Cost of Ownership (TCO)
Investing in a Hand-operated Slab Grinding Machine offers clear economic benefits for stone fabrication shops:
- Reduced Capital Expenditure: At a fraction of the cost of an automatic multi-head polisher, the SFM-2600 series handles specialized jobs without tying up major capital.
- Reduced Slab Waste Rate: Defective slabs with localized saw marks or edge chips can be spot-repaired in under 10 minutes rather than rejected or downgraded.
- Extended Abrasive Tool Lifespan: Steady down-pressure and efficient central water delivery prevent premature abrasive glazing, extending diamond disc usable life by up to 25%.
- Minimal Electrical Overhead: The 5.5 kW / 7.5 kW motor setup consumes significantly less power than 50+ kW multi-head polishing lines, dramatically lowering cost-per-square-meter on small batches.
6. Preventive Maintenance & Operating Safety Rules
Daily & Weekly Maintenance Checklist
- Column Lubrication: Clean and apply lithium grease to the solid round column guide surface daily to ensure smooth vertical travel.
- Pivot Bearing Checks: Lubricate the dual-arm swivel joints weekly to prevent dust buildup and maintain low manual swing resistance.
- Water Line Inspection: Flush the central cooling line to clear slurry sediment and ensure uninterrupted 1.0 m³/h water flow to the grinding head.
Operator Safety Protocol
- Wet Operation Standard: Always maintain full water flow during grinding to suppress airborne silica dust and keep the workspace compliant with factory air standards.
- Emergency Stop Control: Familiarize operators with the prominent emergency stop button located on the PANASONIC touch-sensitive panel.
7. Global Warranty, Spare Parts & Factory Direct Support
- 12-Month Structural & Electrical Warranty: All mechanical castings, SIEMENS motors, and PANASONIC PLC modules are covered under a 1-year comprehensive warranty.
- 24/7 Remote Technical Assistance: Kaida's engineering division provides remote diagnostic support to resolve operational queries instantly.
- Rapid Spare Parts Dispatch: Common consumables and replacement components (spindle bearings, water seals, switches, air cylinders) are shipped from Shuitou Town, Fujian Province within 24–48 hours.
Contact & Procurement Enquiries
Manufacturer: Fujian Province Kaida Stone Machinery Co., Ltd.
Address: DK27-E Hailian Pioneer Park, Shuitou Town, Nan'an City, Fujian Province, China
WhatsApp / Mobile / WeChat: +86-18250601100 / +86-15960555832
Email: info@kaida888.cn / technic@kaida888.cn
Official Website: www.kaidamachines.com
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