On-Site Crankshaft Grinding Machine | Crankshaft Polishing Machine – RA Power Solutions

Crankshaft grinding machines are designed to maintain the accurate tolerances as per the engine manufacturer’s recommendation

Generally, it is observed that even for the higher diameter of crankpin and main journal of the crankshaft the tolerances do not exceed more than 0.05mm in order to achieve such close tolerances of crankpin and main journal of crankshaft RA power designs and manufactures on-site crankshaft grinding machine which has the capability to maintain the close tolerance of even 0.01mm/0.02mm which is far better than the close tolerance specified by the engine manufacturers.

The on-site crankshaft grinding machine and crankshaft polishing machine manufactured by RA power solutions has the following features:

    1. Crankshaft grinding machine is designed in a way that it can be inserted from the inspection window of the engine block thus there is no need of removal of the crankshaft from the engine block.

    2. In case of space restrictions, RA power has the capability to design the equipment according to the space available on site for grinding or polishing of crankshaft/turbine/alternator shaft/rotor shaft etc…

    3. The on-site crankshaft grinding machine is lightweight portable and can be easily carried to the site all over the world. The crankshaft grinding  machine is packed in the suitcase and is carried as accompanied baggage accepted by all international airlines

    4. The main body of crankshaft grinding equipment is manufactured out of titanium alloy which is lightweight and can absorb the vibrations this feature of crankshaft grinding machine facilitates RA power technicians to undertake crankshaft repair on board the vessel while it is sailing, maintaining the close tolerances within 20 microns.

    5. Crankshaft grinding machine designed and manufactured by RA power can presently work up to 700mm diameter which we are in process of extending up to 1000mm.


RA power has sold more than 70 crankshafts grinding machines all over the world which are performing satisfactorily the cost of the machine is low and is affordable for repair workshop, shipping company, power plants etc…

 Crankshaft grinding machine for repair and grinding
Crankshaft grinding machine for repair and grinding
Crankpin grinding on board the vessel
Crankpin grinding on board the vessel
Crankshaft Grinding Machine for Small Diameter
Crankshaft Grinding Machine for Small Diameter


Importance of Hardness in Crankshaft – RA Power Solutions


The hardness of crank pin and main journal of crankshaft is of great importance for the satisfactory performance of the crankshaft. In case of low RPM diesel engine, the crankshafts are not hardened and the hardness is achieved by the metallurgical properties. In case of high RPM engine, crankshafts are hardened. The most common process followed by the manufacturers of crankshaft is to go for induction hardening.

Due to seizure of bearings, the temperature goes high and the hardness increases. The increase in hardness makes the crankshaft brittle resulting to the development of crack.

RA Power Solutions Pvt. Ltd. suggests that whenever seizure of bearings takes place it is important that crankshaft hardness is checked and presence of crack should also be checked either by dye penetrant process or Magnaflux.

Author is Managing Director of RA Power Solutions Pvt. Ltd. having almost four decades of hands on experience in providing consultancy, repair and supply of new and reconditioned crankshafts for high capacity diesel engine. More than 2000 crankshaft have been successfully repaired all over the world, some of which were even rejected by reputed engine manufacturers.