The smarter grinding wheel knows when to give way

Author: Daniel Schauber

When the world’s hardest material is combined with a soft, flexible bond, the result is a tool with highly specialised grinding properties. Elastic-bonded diamond grinding wheels demonstrate their strengths in finishing applications, where they can produce extremely smooth surfaces without altering the workpiece’s contours.

Such innovations are increasingly important as manufacturers face the challenge of producing more complex and precise components from highly resistant materials. Conventional production methods often reach their limits, particularly when delicate surfaces require exceptionally controlled machining.

These developments were among the advanced grinding technologies highlighted at GrindingHub 2026 in Stuttgart, where exhibitors and researchers presented solutions for achieving exceptional surface quality in demanding manufacturing applications.

For demanding finishing and polishing processes

Elastic grinding and polishing tools are used across a wide range of industries. In metalworking, they refine the surfaces of products ranging from precision surgical instruments to heavy-duty turbine blades. By improving surface quality and process reliability, these tools can help accelerate production while increasing cost-effectiveness and sustainability.

“Our elastic-bonded diamond tools demonstrate their strengths wherever extremely hard materials, such as carbide, need to be machined with precision,” says Jens Meiberg, Head of Technology Development at GrindingHub exhibitor Artifex Dr. Lohmann GmbH & Co. KG. The company, based in Kaltenkirchen near Hamburg, specialises in elastic grinding and polishing tools.

“They achieve their maximum effect particularly in applications where extremely fine surfaces, including mirror finishes, are required,” Meiberg explains.

This makes the tools particularly suitable for demanding finishing and polishing operations. Artifex is currently focusing on machining carbide drilling and milling tools to improve their cutting edges and enable more efficient chip removal.

Greater efficiency and lower overall costs

Achieving an optimal surface is only one consideration. In industrial production, manufacturers must also determine whether the improvement in surface quality justifies the investment.

“Studies show service-life improvements of more than 50 percent compared with unprepared tools,” says Meiberg. When combined with faster chip flow and greater chip-removal volumes, these improvements can deliver significant cost and performance advantages.

Machining with elastic-bonded diamond tools can considerably improve workpiece surface quality. In practice, this can extend the service life of cutting tools used in subsequent operations while supporting more stable and reliable production processes.

“Users benefit from greater efficiency and reduced overall costs,” Meiberg adds.

Gentle machining for delicate surfaces

Some surfaces are so sensitive that they must be machined with exceptional care. According to Meiberg, flexibly mounted diamond particles can create glossy surfaces without changing the workpiece’s contours by selectively removing microscopic material peaks.

Within the flexible bonding matrix, the evenly distributed abrasive particles can move slightly under pressure. In simple terms, the soft bond gives way, allowing the grains to adjust as they pass over the surface instead of scratching it aggressively. The material is therefore gently smoothed and polished without significantly changing its shape.

This is what makes the grinding wheel “smart”: it knows when to give way.

“The pressure and speed parameters pose the greatest challenge in preventing grain break-outs from this newly developed soft bond,” Meiberg explains.

Once the process is properly controlled, the required surface quality can be reproduced throughout the grinding wheel’s service life. Tool-changing capabilities within the machine also allow multiple operations to be completed in a single clamping, reducing the need for separate downstream processes.

Artifex’s in-house Research and Development Department continues to advance its diamond-tool technology, particularly in response to new carbide alloys and modern carbide-tool designs.

Research extending into the nanometer range

Despite recent advances, considerable scope remains for fundamental research at the micro- and nanometer scale. One important area is the use of flexible precision-machining tools to finish structured surfaces.

Dr. Monika Kipp, Head of the Grinding Technology Department at the Institute of Machining Technology at TU Dortmund University, is closely involved in this research.

“One example of the use of flexible precision-machining tools is the finishing of structured surfaces,” says Kipp.

When structured surfaces are produced by milling, microscopic burrs may remain. Removing these burrs without significantly changing the original structure—while simultaneously improving the surface finish—requires highly adaptable tools that remove only a minimal amount of material.

“To achieve this goal, our research focuses on the fundamental process behavior of flexible diamond tools,” says Kipp, who was recently awarded the Otto Kienzle Commemorative Medal by the WGP, the German Academic Association for Production Technology.

Perfect process choreography

When machining highly sensitive surfaces with flexible tools, manufacturers must understand exactly how the tool and material interact.

“To avoid unwanted contour changes in precision machining with elastic-bonded diamond grinding wheels or other flexible grinding tools, it is essential to understand the fundamental process interactions,” Kipp explains.

The key challenge is coordinating process parameters with the bonding strength and flexibility of the tool, as these factors determine the local contact conditions. Targeted adjustments to process control and tool kinematics can also improve the result.

The process can be compared to carefully planned choreography: How quickly does the grinding tool move? How fast is the workpiece moving? At what angle and in what pattern do the abrasive grains contact the surface? How often does each grain engage with the material?

Achieving the desired surface quality requires every movement to be precisely coordinated.

Three key factors: contact pressure, contact time and grain size

According to Kipp, surface quality in precision machining is strongly influenced by the local contact conditions between the tool and workpiece.

“When designing the process, a distinction must be made according to the objective: whether the aim is to achieve the lowest possible roughness or to rework functional surfaces containing structural or contour elements,” she explains.

Flexible abrasive tools can support both types of application. The amount of material removed—and therefore the final surface finish—can be controlled by adjusting factors such as contact pressure, contact time and abrasive grain size.

The grinding gap remains a mystery

Applications operating at the limits of what is technically possible and economically viable continue to offer a broad field for industrial and academic research.

A familiar saying among grinding experts still holds true: “The grinding gap is a mystery.”

The phrase reflects how much remains to be understood about the physical and process-engineering mechanisms occurring where the grinding wheel meets the workpiece. By uncovering these mechanisms, researchers and manufacturers can further optimise industrial grinding processes and make production more precise, efficient and sustainable.