Types of Dressers

Three types of dressers are used to dress the wheels of CNC grinders used for grinding complex shapes. This type of dresser is mainly in use on CNC grinding machine tools to automatically dress the grinding wheel via computer control in specialist areas requiring complex shapes such as grinding bearing raceways.

1.Stationary dresser

A stationary dresser can have multiple diamonds hand set or a (mesh) across a given width. These type tools are typically used to dress straight faced wheels. Stationary tools can also be a single diamond brazed into the tip and ground to a specific radius size. A CNC dressing program will utilize this specific tool nose radius offset and move it across the face of the wheel, moving in and out to create the desired profile. The grinding wheel's profile is controlled by the CNC program used to dress the wheel, rather than by the profile of the dresser itself.

2.Diamond dressing rolls

A diamond dressing roll is a dressing roll coated with diamond particles. It wears more slowly and less wear mean they can be used to achieve tighter tolerances than plain crush rolls.

3.Diamond rotary dressers

A rotary dresser (sometimes referred to as a pizza-cutter dresser) is a disc with a hard material - usually diamond - attached to the edge. The grinding wheel's profile has a specific radius size and is controlled by the CNC program used to dress the wheel, rather than by the profile of the dresser itself.[

Diamond dressing rolls and diamond rotary dressers are the best choice for vitrified CBN wheels.

Due to that its self - sharpening is weaker, vitrified CBN grinding wheel should be dressed in time to ensure its reasonable tool life. Otherwise, it will cause vibration, roughness value above required, burns or cracks on the surface of workpiece, etc.

Except the above reason, dressing is used for vitrified CBN wheels for the following occasions:

1. Grinding wheel is clogged by chips;

2. Some workpiece chips are bonded to abrasive grains;

3. Grinding wheel profile is distorted;

4. Fine dressing in precision grinding, etc.