MQ8260A Crankshaft Grinder Φ580×1600mm Engine Rebuild Workshop

MQ8260A Crankshaft Grinder is a Φ580 × 1600 mm universal crankshaft grinder produced by BEACON, designed for automobile, tractor and diesel engine manufacturing plants and repair workshops to precision grind the main bearings (main journals) and crankpins (connecting rod journals) of engine crankshafts. The machine adopts a standard crankshaft grinder structure with belt speed change on the headstock, cross chucks, friction coupling, an Φ80 mm large diameter grinding wheel spindle, hydrostatic rolling guide, hydraulic wheelhead rapid approach and withdrawal, plus automatic circulation lubrication, and can handle crankshafts up to Φ580 mm swing diameter, 1600 mm length and 120 kg work weight, making it the classic universal model for workshop crankshaft repair.

MQ8260A Crankshaft Grinder Core Application Industries

As a classic universal model of crankshaft grinder, the MQ8260A is widely used in the following industries:

• Automobile manufacturing and repair workshops: used for precision grinding of main journals and crankpins on passenger cars, SUVs, pickups and heavy duty trucks, covering common models such as Mercedes-Benz Actros / Axor, Volvo FH16, Scania R450, MAN TGX, Iveco Stralis, Renault T series, FAW J6, Dongfeng Tianlong, Sinotruk HOWO and Foton Auman.
• Tractor and agricultural machinery manufacturing workshops: used for crankshaft precision grinding and repair on John Deere, Case IH, AGCO, Kubota and Yanmar tractors.
• Diesel engine manufacturing and repair workshops: used for crankshaft repair on Cummins ISB / ISX / QSK, Volvo Penta, MAN D2676, DDC DD15, Detroit Diesel Series 60, MTU and Komatsu SAA6D medium and heavy duty diesel engines.
• Marine diesel engine repair workshops: used for large power crankshaft repair on MAN B&W, Wartsila, Shaanxi Diesel and Weichai marine diesel engines, and can grind marine engine crankshaft main journals and crankpins within Φ580 mm.
• Construction machinery and generator set repair workshops: used for engine crankshaft repair on Caterpillar, Komatsu, Hitachi, Liebherr and Volvo CE construction machinery, plus crankshaft precision grinding on Cummins / Perkins / Volvo diesel generator sets.

MQ8260A Main Technical Parameters

MQ8260A Crankshaft Grinder core specifications (from the manufacturer technical data):

• Maximum swing diameter x maximum work length: Φ580 x 1600 mm
• Maximum grinding length in 3-jaw chuck: 1400 mm
• Center height: 300 mm
• Work spindle speed: 25 / 45 / 95 r/min (3 steps)
• Maximum work weight: 120 kg
• Wheel spindle speed: 740 / 890 r/min (2 steps)
• Wheel peripheral speed: 25.6 to 35 m/sec
• Grinding wheel size (O.D. x Width x Bore): Φ900 x 32 x Φ305 mm
• Wheel spindle diameter: Φ80 mm
• Cross feed per turn of hand wheel: 1 mm, per graduation 0.005 mm
• Table longitudinal travel per turn: 5.88 mm (coarse) / 1.68 mm (fine)
• Total motor power: 9.82 kW
• Overall dimensions (L x W x H): 4166 x 2037 x 1584 mm
• Net weight: approximately 6000 kg

MQ8260A Crankshaft Grinder Structural Features

MQ8260A Crankshaft Grinder is designed following the proven structure of a universal crankshaft grinder, with the following features:

• The headstock adopts belt speed change, providing the operator with three work speeds of 25 / 45 / 95 r/min for easy switching between rough grinding and fine grinding.
• Both the headstock and tailstock use cross chuck structure, making it convenient to clamp the crankshaft main journals and the flywheel end with stable positioning.
• The headstock transmission chain uses a friction coupling, easy to adjust and reliable in overload protection.
• Table longitudinal travel supports both manual and motorized modes with digital display at 0.005 mm resolution.
• The wheelhead rapid approach and withdrawal is controlled by a hydraulic device with digital display at 0.005 mm resolution, allowing the operator to precisely control the grinding infeed.
• The grinding wheel spindle diameter is Φ80 mm, with strong rigidity and strength, forming the hardware foundation for long life grinding on this machine.
• The wheelhead uses rolling guide ways, with sensitive movement and good long term accuracy retention.
• The bed ways and the wheelhead ways are lubricated by automatic oil pump circulation, reducing maintenance frequency.
• Optional tailstock air cushion is available for quick forward and backward movement of the tailstock.

Typical Grinding Applications and Accuracy

MQ8260A is mainly used in workshops for the following two types of crankshaft grinding:

• Main bearing journal precision grinding: removes wear, roundness error and surface fatigue layer on the crankshaft main journals, restoring the crankshaft roundness and cylindricity.
• Crankpin (connecting rod journal) precision grinding: uses an eccentric grinding fixture to grind the crankshaft connecting rod journals, restoring the crankshaft throw and connecting rod journal dimensional accuracy.

MQ8260A can achieve IT5 to IT6 roundness accuracy under fine grinding conditions. For a universal crankshaft repair workshop, this is enough to cover the precision grinding needs of heavy duty truck, bus, construction machinery and marine diesel engine crankshafts.

Crankshaft Grinder Selection and Use Tips

For workshops that are evaluating a crankshaft grinder, we suggest paying attention to the following points:

• Work swing diameter and length: select the right specification according to the most common crankshaft type repaired in the workshop (passenger car / heavy duty truck / marine), MQ8260A Φ580 x 1600 mm covers universal medium and heavy duty crankshafts.
• Maximum work weight: MQ8260A maximum load 120 kg, covering mainstream heavy duty truck and construction machinery crankshafts.
• Wheel spindle rigidity: an Φ80 mm large diameter grinding wheel spindle is the key to stable grinding accuracy, and is standard on this machine.
• Control mode: the combination of manual plus motorized plus digital display is the best cost effective solution for entry to mid level workshops. For full automatic CNC grinding, please consider the MQ8260A CNC upgraded version.
• Wheel peripheral speed: this machine 25.6 to 35 m/sec, supporting standard aluminum oxide and CBN wheels.

MQ8260A Workshop Matching Suggestions

MQ8260A is usually used together with the following equipment in a BEACON workshop to form a complete crankshaft repair line:

• BEACON Crankshaft Crack Detector: detects crankshaft fatigue cracks.
• BEACON Crankshaft Cleaning Machine: cleans crankshaft oil passages before grinding.
• BEACON Dynamic Balancing Machine: performs crankshaft dynamic balancing after grinding.
• BEACON Cylinder Boring Machine T8014 / T8120 plus Crankshaft Grinder MQ8260A: complete engine overhaul matching equipment.

MQ8260A Crankshaft Grinder is shipped with rust proof wooden case packaging, FOB Qingdao, with 12 months worldwide warranty. OEM voltage, color and accessory customization are available by contacting the BEACON sales engineer.

1. Universal Workshop Coverage - MQ8260A crankshaft grinder is designed for diesel engine, heavy truck, tractor, ship and construction machinery engine rebuild workshops, with 580x1600mm capacity that covers mainstream automotive, industrial and marine crankshaft repair applications.

2. Heavy Duty Mechanical Bed - The machine bed and wheelhead use roller ways and an automatic oil pump lubrication cycle, keeping the machine stable under continuous workshop use and giving the operator a long term geometry platform for accurate crankshaft grinding.

3. 80mm Wheel Spindle with Rigid Construction - The grinding wheel spindle diameter is 80mm, giving strong rigidity and stiffness for heavy duty crankshaft journal grinding, and the wheel peripheral speed of 25.6 to 35 m/sec supports both standard aluminum oxide and CBN wheels for operator flexibility.

4. 3 Step Work Speeds and 2 Step Wheel Speeds - The headstock gives three work speeds 25, 45 and 95 r/min through belt change, and the wheel spindle gives two speeds 740 and 890 r/min, so the operator can match the grinding parameters to the diameter and material of the crankshaft being repaired.

5. Hydraulic Wheelhead Rapid Approach and Withdrawal - The wheelhead rapid approach and withdrawal is controlled through hydraulic means with digital display at 0.005mm resolution, giving the operator a fast and controlled infeed on every pass and reducing operator fatigue during long crankshaft repair jobs.

6. Direct Sales and Worldwide Delivery - BEACON supplies the MQ8260A crankshaft grinder directly from the Jinan factory with plywood case export packaging, 12 month warranty, multilingual user manual, OEM voltage and color options, and shipment worldwide by sea or air from Qingdao port.