Superfinishing Machines

Superfinishing Process with Stones for Camshaft and Crankshaft Surface Finishing

Superfinishing process is well-adapted to the manufacturing lines of rods, shafts, crankshafts and camshafts. We offer driveline manufacturers both centerless grinding machines and superfinishing machines as surface polishing solutions to attain the level of surface smoothness or workpiece geometry required.


We have supplied superfinishing machines to over 350 clients in the automotive and electronics industries worldwide since 1978. All our machines meet European and American safety standards, allow remote monitoring, and enable minimum tool change time with modularized stone guides. Our customized loading and unloading systems seamlessly integrate our surface grinding machines with your existing production line.

Superfinishing Solutions for Shock Absorber Piston Rods, Crankshafts, Camshafts & Speed Gears

We offer various through-feed and plunge-finishing superfinishers and centerless grinders to manufacturers of engine valves, crankshafts, camshafts, drive-train gears, piston pins and shock absorber piston rods. Our versatile superfinishers are used by global Tier 1 automotive parts manufacturers whose superfinishing process cycle times demand a feed speed of 20 feet per minute.


Machine specifications can be customized to the customer’s processes, required roughness needs, PLC preferences, feeding methods, and equipment safety standards.

Superfinishing Machines | Stone Finishing

We offer customized superfinishers with different roller sizes, stone guides, and oscillation support. The modularized stone guides are designed for quick tool change, enabling operators to take as little as 15 minutes to switch stones for different workpiece diameters and lengths. Our stone guides not only shorten the production cycle time, but also make maintenance easy and straightforward.


LPR’s superfinishing machines are equipped with a range of features and customization options. To improve productivity and reduce the costs of your operations, our machine allows 2-5 surfaces to be finished simultaneously. Clients can choose between manual and automatic options for loading and unloading. We can also design custom machines for specialized grinding applications including inner and outer diameter finishing, gear finishing or wheel hub finishing.


Read our superfinisher specifications and case studies to learn more about our engineering expertise as a leading micro-grinding machine manufacturer in the automotive industry.

Superfinishing Machines Specifications PDF Icon

Case Study: Superfinishing Machine for Automotive Parts Manufacturing PDF Icon

A leading automotive parts manufacturer in USA needed to superfinish shock absorber piston rods with post chrome plating. We provided them with a superfinishing machine that achieved their workpiece surface roughness and diameter tolerance requirements while meeting their electrical safety standards.


Case Study: Superfinishing Machine for Ceramic Parts Manufacturing PDF Icon

A German manufacturer of precision ceramic components wanted to replace their vibratory grinder with a superfinishing machine. A major concern was the hardness of the finishing stone. We provided a custom superfinisher and tested various combinations of stone grades to find the ideal solution for their application.


Case Study: Superfinishing Machine for Shock Absorber Piston Rods PDF Icon

A global Tier 1 manufacturer of shock absorber piston rods was in need of a superfinishing machine that could achieve superior surface finishes and tight tolerances within short cycle times. We provided our DSF-900 model, designed for quick stone change times and precise roller setting.

Superfinishing Machines | Tape Finishing

Our Tape-type Superfinishing Machines achieve consistently even finishes down to 0.01 Ra on a variety of automotive parts such as crankshafts, camshafts, engine valves, gear shafts and cylinders. By combining workpiece rotation and tool oscillation with the continuous feeding of abrasive 3M Microfinishing film, we provide superior surface finishes, free of the chatter marks seen with stone grinding. Our tape finishing solutions offer benefits including easy monitoring and operation, availability of customized attachments, and a durable mechanical oscillation system.

Other Microfinishing Solutions | Lapping & Buffing MachinesPDF Icon

  • Lapping Machines: Our lapping machines are mainly used for finishing journal pins, oil seal parts, and crankshaft and camshaft flanges.
  • Buffing Machines: The major application of our buffing machine is for processing the outer face of steering rack bars.

Superfinishing Machine Applications | Engine, Transmission and Chassis Components

Engine Components

  • Crankshaft
  • Camshaft
  • Piston Pin
  • Rotor shaft
  • Water Pump Shaft
  • Intake and Exhaust Valves
  • Balance Shaft
  • Pump Gear
  • Rocker Arms, Valve Tappets/Lifters

Transmission Components

  • Reverse Clutch Retainer
  • Clutch Hub
  • Sun Gear
  • Direct Clutch Retainer
  • Underdrive Clutch Retainer
  • Output Gear
  • Annulus Gear
  • Planet Carrier
  • Speed Gear
  • Clutch Housing

Chassis Components

  • Tie Rod End
  • Shock Absorber Rod
  • Ball Joints

Superfinishing Machines for Engine and Transmission Component Manufacturers

As grinding machine experts in the automotive industry, we are proud to be the largest grinding machine supplier to Hyundai-Kia, and a major superfinisher supplier to global tier 1 companies making engines and transmission components. We strive to come up with machine and tool designs that minimize human error and produce consistent quality, independent of the operator’s experience.


Our exemplary clients of surface grinding machinery in the automotive industry include, but are not limited to:

  • Hyundai & Kia: Crankshaft Lapping Machines, Superfinishing Machines
  • Beijing Beinei: Camshaft Lapping Machines
  • Great Wall Motors: Crankshaft Lapping Machines
  • Linamar: Superfinishing Machines
  • Liuzhou Ruiming Weiluo: Camshaft Lapping Machines
  • Monroe, Tenneco Group: Superfinishing Machines
  • Seowon Cam: Camshaft Lapping Machines
  • World Group: Superfinishing Machines

Shock Absorber Surface Finish

 Microfinishing Superfinisher for Automotive Parts Manufacturer in USA

Piston Rod Superfinisher
Piston Rod Superfinisher

Global Manufacturer’s Requirements: A US-based Tier 1 manufacturer contacted LPR Global with specific needs for automotive parts manufacturing equipment. They needed to superfinish shock absorber piston rods with post chrome plating.


The diameter of the workpieces ranged from 11 mm to 25 mm, with lengths of 100 mm to 640 mm, and chrome-plated length between 50 mm and 440 mm. The required surface roughness after superfinishing was maximum Ra 0.05 μm with a diameter tolerance of +/- 0.001 mm.


LPR’s Superfinisher Solution: We worked closely with the manufacturer’s engineering and technical teams to develop a solution that precisely met their surface roughness and tolerance requirements. The hydraulic stone system was equipped with eight sets of hydraulic stone guides. The feeding system included a trimming belt and pulley controlled by an inverter motor.


The oscillation head’s ball-stroke system provided 1 mm to 5 mm oscillation strokes controlled by an inverter motor. As per the client’s safety standards for electric control, our machine was equipped with Allen Bradley PLC and Schmersal safety relay modules

Surface Finishing for Ceramics

Superfinisher for Custom Ceramic Parts Finishing

Global Manufacturer’s Requirements: Aleading German manufacturer was looking for a finishing solution to replace vibratory grinding for ceramic parts processing. Their existing vibratory grinding machine produced poor quality results, so the client had to manually treat the surface after the centerless grinding operation.


They wanted to process alumina Al2O3 parts with an outer diameter of 12Ø, an inner diameter of 7Ø, and a length of 22 mm. The required surface roughness after superfinishing was Rp <0.2 µm with a tolerance of 0.008 mm. The ceramic parts required very hard finishing stones such as diamond stones, and the challenge lied in finding the right grade. If the stone property was too soft, the client would have to replace the stones frequently, driving their production costs up.


LPR’s Superfinisher Solution: We developed a customized superfinishing machine to test the client’s samples with a mix of different grade stones. We were able to find the right combination of stones to minimize stone wear and ultimately reduce the production costs.

Microfinish Stone Guide
Superfinishing Machine

Superfinishers for Piston Rods

 Custom Superfinishing Solutions for Customer’s Requirements

Superfinisher Stone guide
Superfinisher Stone Guide Close Up

Global Manufacturer’s Requirements: A US-based Tier 1 manufacturer of shock absorber piston rods was interested in our DSF-900 superfinisher model. The client wanted to achieve surface roughness of maximum Ra 0.05 μm with a diameter tolerance of ±0.001 mm and a cycle time of 20 ft/min. They also required the changeover time for rods of different diameters and lengths to be less than 30 minutes.


LPR’s Superfinisher Solution: We provided the DSF-900 through-feed superfinishing machine with a unique roller-setting system and quickrelease stone holders. The size of the setting jig for any workpiece could be easily calculated using a formula, allowing precise roller setting and easy changeover.


We designed and manufactured setting jigs for different rod diameters. The quick-release stone holders, which use levers to grab and release stones, reduced human error to a minimum while operators were setting rollers and changing stones. In addition, the machine downtime was kept to less than 20 minutes during the stone change time.

Surface Grinding Machine for Automotive Rods

Providing Rebuild and Complete Overhaul with Maintenance, Spare and Wear Parts

A global tier-1 automotive parts supplier located in USA, who has been exclusively using our superfinishing machines for many years requested an overhaul for one of their superfinishing machines. With a cycle time of 20ft/min, the superfinishing machine was used heavily for processing shock absorber piston rods. The original installation was in 2013, and overall maintenance and refurbishing was direly needed as the maintenance for the machine in question was neglected due to the facility changing hands, and the machine’s condition was not up to our Korean manufacturer’s recommendations.


Working closely with our client and the superfinishing machine manufacturer, we conducted onsite surveys and meetings to identify current issues, suggest solutions and negotiate on finalizing the overhaul project including scope, price and schedule.  While keeping time and cost as important aspects of this project, we strived to meet their expectations without sacrificing quality or our stringent safety standards.


Superfinishing Machine Overhaul – Machine Disassembly, Cleaning, Repair, Update, and Testing

It was agreed to undertake onsite repairs for several aspects of the machine including the electronics, such as the Allen Bradley PLC, and safety switches, mechanical parts such as the oscillation bar and roller unit among others. Old parts were cleaned and reused whenever possible, but new parts were installed when updates were requested or was more cost effective. For example, new feed in & out conveyors were also shipped from Korea as it was decided that a new conveyor was more cost effective than repairing the existing conveyor.


Splitting the work between the team of engineers onsite and the Korean manufacturer’s factory in Korea, the tasks were carried out on both fronts and then shipped out onsite to shorten the downtime of the machine. On site at the client’s factory in the US, a team of engineers from Korea carried out the repairs. From disassembling to cleaning and to repairs as well as updates, the engineers ensured that every task was up to the client’s specifications and requirements.


Superfinishing Machine – Full Service Support

From purchase, installation, maintenance and repairs, we at LPR Global will stand by our product and ensure that our machines are up to your standards by assisting you in every step of the way.

Superfinisher Open
Superfinisher Testing

Superfinishing Machines | Lapping Machines

LPR Global provides a wide range of solutions to your finishing needs. Whether it is a standard machine or a customized one, we can meet your required roughness, cycle time, PLC preference, specific safety standards and integrate with your pre and post processes.


Superfinishing Machines | Through Feed Finishing

• Workpiece: Piston pin
• Weight: 2.5 Tons


Superfinishing Machines | Through Feed Finishing

• Workpiece: Shock absorber rod
• Rollers are interchangeable with Supfina’s rollers


Crankshaft Lapping Machines

• Workpiece: Crankshaft
• Various models of crankshaft lapping machine are available upon request


Camshaft Lapping Machines

• Workpiece: Camshaft
• Various models of camshaft lapping machine are available upon request

Lapping Machines | Plunge Finishing | Automotive Components

Superfinishing Machines | Automotive Parts

How to Surface Grind Shock Absorber Rods

Centerless Grinding | Superfinishing

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