Professional Precision Regrinding for Engine Crankshaft Overhaul
This machine serves as core special equipment for engine remanufacturing. It accurately grinds worn, scored and out-of-round crankshaft main journals and crank pins, corrects geometric tolerances including roundness and cylindricity, and restores standard dimensions as well as qualified surface finish to meet strict engine overhaul requirements, effectively repairing failed crankshafts that cannot work normally.
Dual-Purpose Design to Maximize Workshop Equipment Value
Apart from professional crankshaft repairing work, the grinder can be used as a universal external cylindrical grinder. It supports external circle precision grinding for camshafts, drive shafts and various straight shaft workpieces. The dual-function integration greatly improves equipment utilization rate, brings more processing possibilities and better investment return for auto repair and mechanical maintenance workshops.
Rigid Heavy-Duty Structure Delivers Consistent Micron-Level Precision
Adopting one-piece cast iron anti-vibration bed, the machine is configured with cross adjustable double chucks for stable clamping. It supports both manual and motorized worktable travel, together with hydraulic rapid feed of the wheel head. The whole solid mechanical structure suppresses grinding vibration efficiently, realizing long-term stable micron-level machining accuracy and keeping reliable processing quality under continuous heavy load.
Humanized Semi-Automatic System Suitable for Repair Technicians
Designed specifically for maintenance workshops, it applies simple mechanical-hydraulic linkage control with easy manual operation. Equipped with safety interlock device to prevent misoperation hazards and automatic guide rail lubrication system to reduce wear loss, the equipment has an extremely low learning cost for operators. Its durable and trouble-free structure adapts to long-time intensive daily use in repair factories.
Technical Specifications
| ITEM | MQ8260B×1600 | MQ8260A×2000 |
|---|---|---|
| Max. Work Diameter × Max. Length | Φ580 × 1600 mm | Φ580 × 2000 mm |
| Worktable | Flat Worktable | Flat Worktable |
| Max. Swing Over Table | Φ580 mm | Φ580 mm |
| Work Diameter Ground with Steady Rest | Φ30–100 mm | Φ30–100 mm |
| Grinding Cylindrical Diameter | Φ30–200 mm | Φ30–200 mm |
| Throw of Crankshaft | 110 mm | 110 mm |
| Max. Work Length Ground in 3 Jaw Chuck | 1300 mm | 1700 mm |
| Max. Work Length Ground Between Centers | 1600 mm | 2000 mm |
| Max. Work Weight | 120 Kg | 120 Kg |
| Center Height | 300 mm | 300 mm |
| Work Speed (Three Steps) | 25, 50, 100 r/min | 25, 50, 100 r/min |
| Max. Cross Movement | 200 mm | 200 mm |
| Wheelhead Rapid Approach & Withdrawal | 100 mm | 100 mm |
| Wheelhead Feed per Turn of Cross Feed Handwheel | 1 mm | 1 mm |
| Wheel Feed per Grad of Cross Feed Handwheel | 0.005 mm | 0.005 mm |
| Wheel Spindle Speed | 760 rpm | 760 rpm |
| Wheel Size | Φ900 × 32 × Φ305 mm or Φ900 × 22 × Φ305 mm |
Φ900 × 32 × Φ305 mm or Φ900 × 22 × Φ305 mm |
| Overall Capacity of Motor | 9.45 kW | 9.45 kW |
| Overall Dimensions (L × W × H) | 4000 × 2100 × 1584 mm | 4650 × 2100 × 1584 mm |
| Packing Dimensions (L × W × H) | 4350 × 2250 × 2000 mm | 5000 × 2250 × 2000 mm |
| Weight | 6700 Kg | 7200 Kg |
| Ovality (New Standard) | 0.005 mm | 0.005 mm |
| Cylindricity | 0.01 mm | 0.01 mm |
| Roughness | Ra 0.32 | Ra 0.32 |
FAQ
1. What types of crankshafts can the MQ6280 grind?
The MQ6280 is designed for precision grinding of crankshafts used in gasoline and diesel engines. It is suitable for passenger cars, commercial vehicles, heavy-duty trucks, agricultural machinery, construction equipment, marine engines, and industrial power units. Its wide machining capacity allows workshops to service a broad range of engine applications.
2. Can the MQ6280 restore worn or damaged crankshafts?
Yes. The machine is designed to regrind crankshaft main journals and connecting rod journals affected by normal wear, scoring, or minor surface damage. Precision grinding restores the journal geometry and surface finish, preparing the crankshaft for use with the appropriate undersize bearings during engine rebuilding. The crankshaft should always be measured and inspected before determining the required grinding allowance.
3. How does the MQ6280 ensure high grinding accuracy?
The MQ6280 features a rigid machine structure, precision spindle system, and stable workpiece support to maintain consistent journal size, roundness, and surface finish throughout the grinding process. Proper wheel selection, dressing, coolant control, and feed rate are all important factors in achieving high-quality crankshaft grinding results.
4. Why invest in an in-house crankshaft grinding machine?
Owning a crankshaft grinding machine allows engine rebuilding workshops to eliminate outsourcing, shorten repair turnaround times, improve quality control, and increase profitability. It also enables businesses to offer complete engine remanufacturing services, providing customers with a faster and more comprehensive repair solution. Industry buying guides consistently identify reduced outsourcing and higher service margins as major reasons for investing in a crankshaft grinder.
5. Is the MQ6280 suitable for professional engine rebuilding workshops?
Absolutely. The MQ6280 is widely used in automotive machine shops, engine remanufacturing plants, diesel engine repair centers, marine engine service companies, and industrial maintenance facilities. It is built for continuous operation, delivering reliable grinding performance for both small-batch and high-volume crankshaft rebuilding.
6. If the machine breaks down, how do you provide after-sales support? Do you provide operation videos?
Yes. We provide comprehensive after-sales support, including remote technical assistance, online troubleshooting, operation manuals, demonstration videos, maintenance tutorials, and live video guidance. If replacement parts are required, genuine spare parts can be supplied quickly to minimize downtime and keep your machine running efficiently.
7. Can you issue Certificates of Origin (CO), Form A, Form E, or other export documents?
Yes. We can provide the necessary export documents—including Certificates of Origin (CO) and other preferential certificates such as Form E—in accordance with the trade agreements and customs requirements of the destination country. We can also assist you in preparing commercial invoices, packing lists, bills of lading, and other export documentation.
8. What is your minimum order quantity (MOQ)? Do you support OEM & ODM customization?
Our standard MOQ is 1 machine for most models. We also provide OEM and ODM services for distributors and equipment brands, including custom logos, machine colors, nameplates, voltage, packaging, and other specifications to meet your market requirements.
9. Which shipping ports do you use? Can you deliver to my designated warehouse?
We typically ship from major Chinese ports, including Shenzhen, Guangzhou, Ningbo, and Shanghai. We can also arrange delivery to your designated warehouse, freight forwarder, or project site through flexible international shipping solutions.
10. How long does delivery take to my country?
Production typically takes 7–35 days, depending on the machine model and order quantity. Shipping time varies by destination and transportation method. Once your order is confirmed, we will provide a detailed production schedule and estimated delivery time.
