How to choose a polishing wheel?

Selecting the right polishing wheel is crucial for achieving a high-quality result when polishing aluminum alloys. When deciding, the key factors are not only the hardness of the material being polished but also the stage of the polishing process itself. Each stage requires a different type of wheel, a different fabric hardness, and sometimes even a different construction.

Coarse Polishing

For the first stage, coarse polishing, the hardest wheels are used — typically sisal or other firm fabrics. These can quickly remove irregularities, grinding marks, and prepare the surface for pre-polishing. This stage significantly influences the final result, as creating a good foundation is essential.

Pre-Polishing

After coarse polishing comes the pre-polishing stage, where impregnated wheels are used. These offer better efficiency and longer lifespan. The most common are the orange wheel for harder pre-polishing and the yellow wheel for finer work before the final polish.

Polishing and Final Polishing

The final gloss is achieved with a white wheel, which has the finest structure and is used to achieve a high shine or to apply waxes.

Polishing Wheel Materials

Each manufacturer offers their own range of fabrics differing in hardness and purpose. One supplier even offers 23 different types, each intended for a different polishing stage.
In the Czech Republic, the most common materials are:

• Hard for coarse work: Dora, Kaliko, Technical fabric, Sisal

• Soft for polishing: Molino 330, Erna

Wheel Construction

Polishing wheels differ not only in the fabrics used — they also differ in construction. You may encounter stitched, pleated, spiral-sewn, or airway-style wheels. Their construction affects airflow and heat buildup. If polishing a temperature-sensitive material, it is better to choose pleated or spiral-sewn wheels, as they cool the surface much more effectively.

Wheel Diameters

Choosing the right wheel also involves selecting the correct inner and outer diameter:

• Inner diameter is selected according to the arbor.

  • Polishers commonly use an M14 thread.

  • Drills use an M8 bolt.

• Outer diameter depends on the type of machine:

  • Drill: up to approx. 150 mm

  • Hand polisher: up to 250 mm

  • Bench polisher: according to manufacturer recommendations

Don’t forget to properly trim the polishing wheel before applying the compound!!!

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