onsite crankshaft grinding and polishing Archives - Rebabbitting Bearing

Insitu Crankshaft Repair | Onsite Crankshaft Grinding And Polishing | 45 Years Of Expertise

Raj — Fri, 18 Apr 2025 11:27:42 +0000

RA Power Solutions Pvt. Ltd. has offered in situ crankshaft repair and polishing services for over four decades. The crankshaft is the most important part for keeping the engine running properly. It is an essential component of engines in marine boats, power plants, and heavy machinery. However, when it becomes damaged or worn out, it can bring operations to a standstill, resulting in costly repairs and downtime. RA Power Solutions, a global pioneer in crankshaft maintenance, has introduced its breakthrough in situ crankshaft grinding technology to Bangladesh. This unique approach is changing the game for industries throughout the country.

With the insitu crankshaft grinding machine, our trained specialists can arrive at a site in the shortest amount of time and fix the crankshaft without removing it from the main engine.

Efficient crankshaft on the engine Restoration: 35 to 700 mm in diameter Grinding Accuracy

Since the crankshaft is the engine’s central component, it transforms reciprocating motion into the linear movement that powers the engine through the use of connecting rods. With the process, technology, and onsite crankshaft grinding equipment from RA Power Solutions, crankshaft repair is now feasible without removing the crankshaft from the engine. These machines range in size from 35 mm to 700 mm. Our technology can repair crankshafts up to 700 mm in diameter, allowing us to fix any crankshaft, regardless of its weight or length.

In general, the crankshaft has several applications, including diesel generators and marine engines. Typical areas of crankshaft applications are as follows:

Compressors
Power generators
Forging hammers
Pumps
Marine engines

RA Power’s Journal and Crankshaft Machining Advantages:

The vast experience of having repaired over 10,000 shafts on any size Main or Auxiliary engine

Specially designed crankshaft machining tooling for insitu reconditioning without dismantling the full engine, deployed all around the globe.

A large, global team of highly skilled machining technicians ensures a rapid, expert response anytime and anywhere.

The latest breed of inspection instruments is available to undertake hardness tests, MPI, surface roughness tests, dimensional inspection, etc.

Our crankshaft grinding machine weighs 1/3rd of our competitors, saving on freight costs.

Giving ship and power plant crews the tools they need to grind and fix crankshafts on site

Years of crankshaft grinding and polishing by RA Power Solutions, it is now possible to not only grind and polish the crankshaft onsite, but also to repair the crankshaft by ship or power plant crew.

For more information on in situ crankshaft grinding, onsite crankshaft grinding, crankshaft grinding, insitu crankshaft grinding repair, onsite crankshaft machining, and crankshaft machining in situ, crankpin bearings, bearings for MAN and MAK engines please contact info@rapowersolutions.com, rajshahani@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs

1. What sizes of crankshafts can you repair onsite?

Customers often want to know the diameter range your equipment handles. RA Power’s insitu grinding is capable of servicing crankpins from 35 mm up to 700 mm (even 50–700 mm) without engine removal.

2. How much downtime and cost savings are involved?

One of the top concerns: how in-situ grinding cuts downtime and expense. By avoiding full engine disassembly and shipping, companies save significantly on labor, transport, and workshop costs.

3. What precision and finish can you achieve?

Customers ask if the onsite process meets OEM specifications. The portable machines deliver precision within 10–25 µm and achieve surface finishes (Ra) that align with OEM standards.

4. Can you repair crankshafts while the engine is in operation or at sea?

A common need in marine and power-plant contexts. Yes—insitu grinding can be done on-vessel (even underway) or at power plants, offering portable, global 24/7 service.

5. What inspection and quality assurance processes do you use?

Customers want confirmation of quality control. Services typically include MPI/crack detection, hardness testing, surface roughness measurement, dimensional checks, vibration testing, ensuring journals are restored to spec.

The post Insitu Crankshaft Repair | Onsite Crankshaft Grinding And Polishing | 45 Years Of Expertise appeared first on Rebabbitting Bearing.

Consequences Of Hand Polishing Of Crankshaft and Benefits Of Crankshaft Polishing Machine

Raj — Mon, 11 Feb 2019 20:12:40 +0000

Manufacturers of high capacity diesel engines are maintaining close tolerances in terms of taper and ovality of crankpin and main journal diameter of the crankshaft. The maintenance of close tolerances and high surface finish results in the generation of more power, longer life of crankshaft and bearing, less noise level, low vibration, friction, and better fuel efficiency. RA Power Solutions has been working on crankshafts of marine engines and engines used for various applications with diameters ranging from 30 mm to 700 mm.

On Site Crankshaft Grinding

What Goes Wrong with Hand Polishing

Based on RA Power Solutions’ decades of experience, here are the main drawbacks:

Bearing line marks and pitting remain
Minor surface damage, like line marks (from bearings) and pitting, is not removed completely by hand polishing. These defects undermine surface integrity and can lead to premature wear.
Taper and ovality get worse, not better
Crankpin and main journals often have tight tolerances for taper and ovality (i.e., deviation from perfect cylindricity or uniform diameter). Hand polishing cannot correct these and often makes them worse.
Surface finish suffers
Engine and bearing manuals usually specify key metrics like surface roughness (e.g., Ra values). Hand polishing can’t ensure you reach those finishes reliably.

What the OEMs / Manuals Require

To deliver optimal performance, crankshaft components must often meet:

Taper & ovality between 0.02 mm to 0.05 mm, depending on diameter.
Surface finish of Ra < 0.25 (unit depends on the standard, usually microns).

These are very tight tolerances, difficult to consistently achieve with hand methods.

Onsite Grinding and Polishing Machines: Key Benefits

RA Power Solutions has developed (and field-tested) portable onsite machines with capabilities for diameters from ~30 mm up to ~700 mm. Here are the advantages they bring:

Benefit	What It Means in Practice
Precision	Grinding + polishing deliver accurate, measurable correction of taper, ovality, surface finish.
Time Saved	Because you don’t need to remove the crankshaft—machine can be inserted via inspection window. Less downtime.
Longer engine / bearing life	Better surfaces, fewer defects mean less friction, wear, vibrations etc.
Cost savings	Avoid repeated failures or having to send the crankshaft out; avoid hiring expensive overseas services.
Transferable skill	Once you have the machine, your own technicians can be trained to use it—so dependence on outside vendors reduces.

Portable Crankshaft Grinding Machine by RA Power Solutions:

RA Power Solutions has introduced a portable, lightweight, onsite crankshaft grinding and polishing machine which is capable of grinding and polishing diameters ranging from 30 mm to 700mm. The onsite crankshaft grinding machine is revolutionary. You can insert this portable equipment through the inspection window of the engine block. There is no requirement for the removal of the crankshaft from the engine block.

RA Power Solutions specializes in crankshaft polishing, offering high-quality services to improve the performance and longevity of crankshafts. our skilled technicians utilize state-of-the-art equipment and cutting-edge techniques for precise and efficient crankshaft polishing. The use of a dedicated crankshaft polisher ensures that the polishing process is done with utmost precision and consistency.

For more information on Onsite Crankshaft Polishing, Crankshaft Grinding please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

The post Consequences Of Hand Polishing Of Crankshaft and Benefits Of Crankshaft Polishing Machine appeared first on Rebabbitting Bearing.

Crankpin Grinding by Crankshaft Grinding Machine – RA Power Solutions

Raj — Thu, 28 Jun 2018 05:46:15 +0000

A diesel power plant based in northern India, having 10 nos. of 12.3 MW Wartsila diesel generating sets, reported a severe casualty involving one of their Wartsila generators. RA Power Solutions’ team of technicians rushed to the power plant with the measuring instruments and onsite crankshaft grinding equipment to assess the cause of the breakdown.

We inspected the crankshaft in detail with dimensional checks, hardness tests, and MPI for cracks and deflection. We found damage on one of the crankpin journals caused by a big-end bearing failure.

Grinding & Repair of Crankpin is in Process

Inspection & Diagnosis:

Taper and ovality in the crankpin is observed as 0.70 mm.
Due to the failure of the bearing, deep line marks were visible.
Hardness and MPI tests were done, and no cracks were observed.

RA Power Solutions’ Edge

RA Power Solutions used the latest design of onsite crankshaft grinding machine, having almost no vibrations. The crankpin was undersized by 1.5 mm, maintaining the tolerance within 10 microns. Our technicians took only 18 hours to complete the Crankshaft repair from the time of the start of the preliminary inspection, grinding, and final inspection. The repair of the crankpin in such a short time was possible due to the latest technology, an onsite crankshaft grinding machine, and the experience of our technicians.

Inspection of Crankpin Before Grinding

Inspection of Crankpin Under Process

RA Power Solutions has four decades of experience in working on crankshafts of high-capacity main and auxiliary engines. Factory training prepares our technicians to repair crankshafts. They strictly follow the manufacturer’s specifications and tolerances.

For more information on Portable Crankshaft Grinding Machine, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

FAQs:

2. When does a crankpin need grinding?

A: You need grinding when a crankpin shows ovality or taper. It also becomes necessary if you notice scoring or surface damage from bearing failure.

1. What is crankpin grinding?

A: It’s the process of machining and restoring worn or damaged crankpins on a crankshaft to OEM specifications.

3. Crankpin grinding done onsite?

A: Yes, with portable crankshaft grinding machines, repairs can be done at the site without dismantling the crankshaft.

5. How much downtime does the process take?

A: In most cases, we complete inspection, grinding, and finishing within 18–24 hours.

4. How accurate is onsite crankpin grinding?

A: Modern machines achieve tolerances within 10 microns, ensuring smooth operation.

The post Crankpin Grinding by Crankshaft Grinding Machine – RA Power Solutions appeared first on Rebabbitting Bearing.