AOV, MFT-R, and PCFC Units

June 03,2021

Related Glossary Terms

  • brushing

    brushing

    Generic term for a curve whose shape is controlled by a combination of its control points and knots (parameter values). The placement of the control points is controlled by an application-specific combination of order, tangency constraints and curvature requirements. See NURBS, nonuniform rational B-splines.

  • grinding

    grinding

    Machining operation in which material is removed from the workpiece by a powered abrasive wheel, stone, belt, paste, sheet, compound, slurry, etc. Takes various forms: surface grinding (creates flat and/or squared surfaces); cylindrical grinding (for external cylindrical and tapered shapes, fillets, undercuts, etc.); centerless grinding; chamfering; thread and form grinding; tool and cutter grinding; offhand grinding; lapping and polishing (grinding with extremely fine grits to create ultrasmooth surfaces); honing; and disc grinding.

  • polishing

    polishing

    Abrasive process that improves surface finish and blends contours. Abrasive particles attached to a flexible backing abrade the workpiece.

  • tolerance

    tolerance

    Minimum and maximum amount a workpiece dimension is allowed to vary from a set standard and still be acceptable.

Tools for Robot-Supported Surface Machining

Modernize your material removal processes and achieve the perfect workpiece finish with new tools for robot-supported surface machining from SCHUNK.

Manual polishing, grinding and brushing operations can be exhausting and require a high level of physical effort. Now, manufacturers can reduce time and costs, lower the risk of employee injury, and achieve perfect results by automating their material removal processes with the help of a robot.

The new AOV and MFT-R units from SCHUNK make the changeover to automated surface machining easy and simple. But customers can achieve even more with SCHUNK by taking advantage of feasibility studies and the comprehensive process knowledge of the SCHUNK sales support team.

Why automated? Why now?

Surfaces are machined by grinding and polishing. With coarse material removal as a post-processing operation, for further machining, or fine machining, sensitivity and precise readjustment are required to achieve the perfect workpiece finish.

Experienced employees perform these tasks intuitively, but manual machining is hard, fatiguing work that is expensive and guarantees no consistently good end result. Modern robot-based automation solutions can perform these taks and impress with optimal performance. The result: perfect surfaces with only a small investment.

The right tool for any purpose

The new SCHUNK machining tools are especially designed for automated applications and always ensure perfectly machined surfaces. The AOV orbital sander tool is specially designed for grinding and polishing workpiece surfaces. The pneumatic unit is driven by a vane motor and achieves rotational speeds of 10,000 RPM. The axial bearing of the motor ensures compliance, and consistent contact forces act on the workpiece surface. Perfect polishing and grinding results can thus be achieved, even if the surfaces initially were uneven.  The contact force can be controlled in two directions via air connections. In other words, during extending and retracting, separate control is possible and may vary if required (range: 6.7 to 67 N.) This ensures that the AOV is machining with consistent contact force even in the case of overhead applications.  The orbital sander tool can be equipped with sanding discs of various diameters (125 mm respectively 5“, or 150 mm respectively 6“.) The grinding tool can be equipped with a suction connection for removed materials, thereby reducing contamination of the robot cell, which further avoids downtimes and results in cost savings.

The MFT-R is the ideal solution for manufacturers who require a particularly flexible and robust polishing spindle for polishing and brushing of workpieces with axial compliance. The spindle is equipped with a pneumatic vane motor with a maximum rotational speed of up to 5,600 RPM, but the rotational speed can be reduced to a minimum for achieving perfect surface end results. The robust motor has a very short stopping time and therefore reduces the whole machining time.  Due to the gimballed bearing, the compensation force and radial compliance of the tool are individually adjustable. Depending on the pressure setting, compliance can be adjusted between 9 N to 70 N. The user can use the optimal value for any application, and therefore achieves high-quality and reproducible results in any installation position. Any workpiece tolerance can be compensated and clearly simplifies path programming of the robot. But the MFT-R has many more features and therefore turns out to be user-friendly: due to the optional axis fixation, the changeover from pendulum to radial compensation is quick and easily possible. Therefore, different workpiece geometries can be flexibly machined with just one tool – this is an economic advantage and helps to cut investment costs almost in half. The MFT-R is available as a stationary unit or can be flexibly mounted to the robot (axially or radially.) SCHUNK offers prefabricated adapter plates for these applications and valuable time can be saved when designing the process.  

The PCFC unit completes the SCHUNK portfolio. If a workpiece must be machined with a previously defined force, the compensation unit renders excellent services. The PCFC ensures that a consistent compliance force is acting in any position, due to the position sensor. It compensates the weight force together with the pressure control valves provided by the customer. The PCFC can be combined with various tools and is therefore suitable for numerous application purposes.

More precision and diversity at a manageable programming and design effort: this is how efficient surface machining can be with the tools from SCHUNK.