Grinding dresser
From Wikipedia, the free encyclopedia
A grinding dresser or wheel dresser is a tool to dress the surface of a grinding wheel.
The objective of dressing the wheel is to
- True the wheel by knocking abrasive particles from the wheels surface and making the wheel concentric. This minimizes vibration and improves surface finish, caused by the out of balance wheel vibrating across the workpiece's surface.
- Dislodging these same abrasive particles also has the affect of exposing fresh abrasive from the wheels surface. Each abrasive grain is a small cutting tool, a worn grain has its edges dulled and loses its effectiveness. Exposing the fresh grains is thus a sharpening process. Glazing of the wheel is evidence of rounded grains and is noticeable by a reflective surface on the spinning wheel.
- Clean the wheel, if a workpiece is used that is softer than the grade of wheel is designed for, the abrasive particles will not be dislodged in time to present fresh, sharp grains. The wheel therefore appears to lose its edge especially as the pores between grains fill with fragments of the workpiece. The wheel is then said to be loaded and is one reason why the selection of wheel is extremely important
They are available as
- Star dressers — A long handled tool with a row of free running, hardened and serrated, discs running at right angles to the handle. These are presented to the grinding wheel as it is turned off and slows down. Force is applied to the face of the slowing wheel with the result that the hardened discs match speed with the face of the wheel allowing the fingers or undulating surface of the dresser, to knock the abrasive grains out.
- Diamond dressers — Shorter handled Diamond tools that either have a matrix of small diamonds bonded to a broad surface on the end of the dresser (top image) or a single diamond mounted in their face (lower image). As the diamond is introduced to the wheels face, the harder diamond survives the contest and the looser grains fall away.
- Dressing sticks — A stick of hard material, usually made from the same materials (silicon carbide) but with a stronger bonding agent. Norbide[1] is one brand of dressing stick made by Norton Abrasives, from boron carbide.
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